——–

——–
Table of Contents

1. General Safety Requirements ……………………………….. 1
   
2. Safety Terms and Symbols ……………………………………. 2
   
3. Quick Start …………… 4
   

Introduction to the Structure of the Oscilloscope …. 4

Front Panel ………… 4

Rear Panel ………….. 5

Control Area ……….. 6

User Interface Introduction …………………………………… 7

How to Implement the General Inspection …………….. 8

How to Implement the Function Inspection …………… 9

How to Implement the Probe Compensation ……….. 10

How to Set the Probe Attenuation Coefficient ……… 11

How to Use the Probe Safely…………………………………. 12

How to Implement Self-calibration ……………………….. 12

Introduction to the Vertical System ……………………… 12

Introduction to the Horizontal System ………………….. 14

Introduction to the Trigger System ………………………. 14

4. Advanced User Guidebook ……..…………………………… 16

How to Set the Vertical System …………………………….. 17

Use Mathematical Manipulation Function …………….. 18

The Waveform Calculation ……………………………………. 18

Using FFT function ………………………………………………. 19

Use Vertical Position and Scale Knobs ……………………. 22

How to Set the Horizontal System …………………………… 23

Zoom the Waveform ………………………………………………. 23

How to Set the Trigger System …………………………………. 24

Single Trigger …………… 25

Alternate Trigger (Trigger mode: Edge) ……………………. 26

How to Operate the Function Menu ……………………………… 27

How to Set the Sampling/Display ………………………………. 27

How to Save and Recall a Waveform ………………………….. 28

How to Implement the Auxiliary System Function Setting … 35

How to Update your Instrument Firmware……………………. 37

How to Measure Automatically…………………………………… 38

How to Measure with Cursors …………………………………….. 42

How to Use Executive Buttons…………………………………….. 44

1. Communication with PC ………………………………………………. 47
   
   

    i     

1. Demonstration ……. 48
   

Example 1: Measurement a Simple Signal ………… 48

Example 2: Gain of a Amplifier in a Metering Circuit … 49

Example 3: Capturing a Single Signal ……………….. 50

Example 4: Analyze the Details of a Signal …………. 51

Example 5: Application of X-Y Function …………….. 53

Example 6: Video Signal Trigger ………………………… 54

1. Troubleshooting ….. 56
   
2. Technical Specifications …………………………………….. 57
   

General Technical Specifications ……………………….. 59

1. Appendix …………….. 60
   

Appendix A: Enclosure ……………………………………… 60

Appendix B: General Care and Cleaning ……………. 60

ii

1.General Safety Requirements

1. General Safety Requirements

Before use, please read the following safety precautions to avoid any possible bodily injury and to prevent this product or any other connected products from damage. In order to avoid any contingent danger, ensure this product is only used within the range specified.

Only the qualified technicians can implement the maintenance.

To avoid Fire or Personal Injury:

• Connect the probe correctly.
  The grounding end of the probe corresponds to the grounding phase. Please don’t connect the grounding end to the positive phase.
  
• Use Proper Power Cord. Use only the power cord supplied with the product and certified to use in your country.
  
• Connect or Disconnect Correctly. When the probe or test lead is connected to a voltage source, please do not connect and disconnect the probe or test lead at random.
  
• Product Grounded. This instrument is grounded through the power cord grounding conductor. To avoid electric shock, the grounding conductor must be grounded. The product must be grounded properly before any connection with its input or output terminal.
  

  When powered by AC power, it is not allowed to measure AC power source directly, because the testing ground and power cord ground conductor are connected together, otherwise, it will cause short circuit.
  

• Check all Terminal Ratings. To avoid fire or shock hazard, check all ratings and markers of this product. Refer to the user’s manual for more information about ratings before connecting to the instrument.
  
• Do not operate without covers. Do not operate the instrument with covers or panels removed.
  
• Use Proper Fuse. Use only the specified type and rating fuse for this instrument.
  
• Avoid exposed circuit. Do not touch exposed junctions and components when the instrument is powered.
  
• Do not operate if in any doubt. If you suspect damage occurs to the instrument, have it inspected by qualified service personnel before further operations.
  
• Use your Oscilloscope in a well-ventilated area. Make sure the instrument installed with proper ventilation, refer to the user manual for more details.
  
• Do not operate in wet conditions.
  
• Do not operate in an explosive atmosphere.
  
• Keep product surfaces clean and dry.
  

2.Safety Terms and Symbols

2. Safety Terms and Symbols

Safety Terms

Terms in this manual. The following terms may appear in this manual:

Warning: Warning indicates the conditions or practices that could result in

injury or loss of life.

Caution: Caution indicates the conditions or practices that could result in damage to this product or other property.

Terms on the product. The following terms may appear on this product:

Danger: It indicates an injury or hazard may immediately happen.

Warning: It
indicates an injury or hazard may be accessible potentially.

Caution: It
indicates a potential damage to the instrument or other property might occur.

Safety Symbols

Symbols on the product. The following symbol may appear on the product:

Hazardous Voltage Refer to Manual

Protective Earth Terminal Chassis Ground

     Test Ground

2.Safety Terms and Symbols

To avoid body damage and prevent product and connected equipment damage, carefully read the following safety information before using the test tool. This product can only be used in the specified applications.

    Warning:

The two channels of the oscilloscope are not electrically isolated. The channels should adopt a common ground during measuring. To prevent short circuits, the 2 probe grounds must not be connected to 2 different non-isolated DC levels.

The diagram of the oscilloscope ground wire connection:

It is not allowed to measure AC power when the AC powered oscilloscope is connected to the AC-powered PC through the ports.

Warning:

To avoid fire or electrical shock, when the oscilloscope input signal connected is more than 42V peak (30Vrms) or on circuits of more than 4800VA, please take note of below items:

• Only use accessory insulated voltage probes and test lead.
  
• Check the accessories such as probe before use and replace it if there are any damages.
  
• Remove probes, test leads and other accessories immediately after use.
  
• Remove USB cable which connects oscilloscope and computer.
  
• Do not apply input voltages above the rating of the instrument because the probe tip voltage will directly transmit to the oscilloscope. Use with caution when the probe is set as 1:1.
  
• Do not use exposed metal BNC or banana plug connectors.
  
• Do not insert metal objects into connectors.
  

3. Quick Start

Introduction to the Structure of the Oscilloscope

This chapter makes a simple description of the operation and function of the front panel of the oscilloscope, enabling you to be familiar with the use of the oscilloscope in the shortest time.

Front Panel

The front panel has knobs and function buttons. The 5 buttons in the column on the right side of the display screen are menu selection buttons, through which, you can set the different options for the current menu. The other buttons are function buttons, through which, you can enter different function menus or obtain a specific function application directly.

Figure 3-1 Front panel

1. Display area
   
2. Menu selection buttons: Select the right menu item.
   
3. Control (button and knob) area
   
4. Probe Compensation: Measurement signal (5V/1kHz) output.
   
5. Signal Input Channel
   
6. USB Host port: It is used to transfer data when external USB equipment connects to the oscilloscope regarded as “host device”. For example: Saving the waveform to USB flash disk needs to use this port.
   
7. Power on/off
   

Rear Panel

5

Figure 3-2 Rear Panel

1. Handle
   
2. Air vents
   
3. AC power input jack
   
4. Foot stool: Adjust the tilt angle of the oscilloscope.
   
5. USB Device port: It is used to transfer data when external USB equipment connects to the oscilloscope regarded as “slave device”. For example: to use this port when connect PC to the oscilloscope by USB.
   

Control Area

1. Function button area: Total 6 buttons.
   
2. Horizontal control area with 1 button and 2 knobs.
   

   “HOR” button refer to horizontal system setting menu, “Horizontal Position” knob control trigger position, ” Horizontal Scale” control time base.
   

3. Trigger control area with 2 buttons and 1 knob.
   

   The Trigger Level knob is to adjust trigger voltage. Other 2 buttons refer to trigger system setting.
   

4. Copy button: This button is the shortcut for Save function in the Utility function menu. Pressing this button is equal to the Save option in the Save menu. The waveform, configure or the display screen could be saved according to the chosen type in the Save menu.
   
5. Vertical control area with 3 buttons and 4 knobs.
   

   “CH1” and “CH2 ” correspond to setting menu in CH1 and CH2, “Math” button refer to math menu, the math menu consists of six kinds of operations, including CH1-CH2, CH2-CH1, CH1+CH2, CH1*CH2, CH1/CH2 and FFT. Two “Vertical Position” knob control the vertical position of CH1/CH2, and two “Scale” knob control voltage scale of CH1, CH2.
   

6. M knob(Multipurpose knob): when a symbol appears in the menu, it indicates you can turn the M knob to select the menu or set the value. You can push it to close the menu on the left and right.
   

User Interface Introduction

    1 2 3    4 5 64    7    8

    17 16 15 14    13    

Figure 3-4 Illustrative Drawing of Display Interfaces

1. Waveform Display Area. 2. Run/Stop

1. The state of trigger, including:
   

   Auto: Automatic mode and acquire waveform without triggering.
   

   Trig: Trigger detected and acquire waveform.
   

   Ready: Pre-triggered data captured and ready for a trigger.
   

   Scan: Capture and display the waveform continuously.
   

   Stop: Data acquisition stopped.
   

2. The two blue dotted lines indicates the vertical position of cursor measurement.
   
3. The T pointer indicates the horizontal position for the trigger.
   
4. The pointer indicates the trigger position in the record length.
   
5. It shows present triggering value and displays the site of present window in internal memory.
   
6. It indicates that there is a USB disk connecting with the oscilloscope.
   
7. Channel identifier of current menu.
   
8. The waveform of CH1.
   
9. Right Menu.
   
10. The waveform of CH2.
    
11. Current trigger type:
    

         Rising edge triggering

Falling edge triggering

Video line synchronous triggering

         Video field synchronous triggering

The reading shows the trigger level value of the corresponding channel.

1. It indicates the measured type and value of the corresponding channel. “T” means period, “F” means frequency, “V” means the average value, “Vp” the peak-peak value, “Vr” the root-mean-square value, “Ma” the maximum amplitude value, “Mi” the minimum amplitude value, “Vt” the Voltage value of the waveform’s flat top value, “Vb” the Voltage value of the waveform’s flat base, “Va” the amplitude value, “Os” the overshoot value, “Ps” the Preshoot value, “RT” the rise time value, “FT” the fall time value, “PW” the +width value, “NW” the -Width value, “+D” the +Duty value, “-D” the -Duty value, “PD” the Delay A->B value, “ND” the Delay A->B value, “TR” the Cycle RMS, “CR” the Cursor RMS, “WP” the Screen Duty, “RP” the Phase, “+PC” the +Pulse count, “-PC” the – Pulse count, “+E” the Rise edge count, “-E” the Fall edge count, “AR” the Area, “CA” the Cycle area.
   
2. The readings show the record length.
   
3. The frequency of the trigger signal.
   
4. The readings show current sample rate.
   
5. The readings indicate the corresponding Voltage Division and the Zero Point positions of the channels. “BW” indicates bandwidth limit.
   

   The icon shows the coupling mode of the channel.
   

   “—” indicates direct current coupling
   

   “～” indicates AC coupling
   

   “” indicates GND coupling
   

6. The reading shows the setting of main time base.
   
7. It is cursor measure window, showing the absolute values and the readings of the cursors.
   
8. The blue pointer shows the grounding datum point (zero point position) of the waveform of the CH2 channel. If the pointer is not displayed, it means that this channel is not opened.
   
9. The two blue dotted lines indicate the horizontal position of cursor measurement.
   
10. The yellow pointer indicates the grounding datum point (zero point position) of the waveform of the CH1 channel. If the pointer is not displayed, it means that the channel is not opened.
    

How to Implement the General Inspection

After you get a new oscilloscope, it is recommended that you should make a check on the instrument according to the following steps:

1. Check whether there is any damage caused by transportation.
   

   If it is found that the packaging carton or the foamed plastic protection cushion has suffered serious damage, do not throw it away first till the complete device and its accessories succeed in the electrical and mechanical property tests.
   

2. Check the Accessories
   

   The supplied accessories have been already described in the “Appendix A: Enclosure” of this Manual. You can check whether there is any loss of accessories with reference to this description. If it is found that there is any accessory lost or damaged, please get in touch with the distributor of OWON responsible for this service or the OWON’s local offices.
   

3. Check the Complete Instrument
   

   If it is found that there is damage to the appearance of the instrument, or the instrument can not work normally, or fails in the performance test, please get in touch with the OWON’s distributor responsible for this business or the OWON’s local offices. If there is damage to the instrument caused by the transportation, please keep the package. With the transportation department or the OWON’s distributor responsible for this business informed about it, a repairing or replacement of the instrument will be arranged by the OWON.
   

How to Implement the Function Inspection

Make a fast function check to verify the normal operation of the instrument, according to the following steps:

1. Connect the power cord to a power source. Press the
   button on the bottom left of the instrument.
   

The instrument carries out all self-check items and shows the Boot Logo. Push the Utility button, select Function in the right menu. Select Adjust in the left menu, select Default in the right menu. The default attenuation coefficient set value of the probe in the menu is 10X.

1. Set the Switch in the Oscilloscope Probe as 10X and Connect the Oscilloscope with CH1 Channel.
   

Align the slot in the probe with the plug in the CH1 connector BNC, and then tighten the probe with rotating it to the right side.

Connect the probe tip and the ground clamp to the connector of the probe compensator.

1. Push the Autoset Button on the front panel.
   

The square wave of 1 KHz frequency and 5V peak-peak value will be displayed in several seconds (see Figure 3-5).

Figure 3-5 Auto set

Check CH2 by repeating Step 2 and Step 3.

How to Implement the Probe Compensation

When connect the probe with any input channel for the first time, make this adjustment to match the probe with the input channel. The probe which is not compensated or presents a compensation deviation will result in the measuring error or mistake. For adjusting the probe compensation, please carry out the following steps:

1. Set the attenuation coefficient of the probe in the menu as 10X and that of the switch in the probe as 10X
   (see “How to Set the Probe Attenuation Coefficient” on P11), and connect the probe with the CH1 channel. If a probe hook tip is used, ensure that it keeps in close touch with the probe. Connect the probe tip with the signal connector of the probe compensator and connect the reference wire clamp with the ground wire connector of the probe connector, and then push the Autoset button on the front panel.
   
2. Check the displayed waveforms and regulate the probe till a correct compensation is achieved (see Figure 3-6 and Figure 3-7).
   

    Overcompensated     Compensated correctly     Under compensated

Figure 3-6 Displayed Waveforms of the Probe Compensation

1. Repeat the steps mentioned if needed.
   

Figure 3-7 Adjust Probe

How to Set the Probe Attenuation Coefficient

The probe has several attenuation coefficients, which will influence the vertical scale factor of the oscilloscope.

To change or check the probe attenuation coefficient in the menu of oscilloscope:

1. Push the function menu button of the used channels (CH1 or CH2 button).
   
2. Select Probe in the right menu; turn the M knob to select the proper value in the left menu corresponding to the probe.
   

This setting will be valid all the time before it is changed again.

The default attenuation coefficient of the probe on the instrument is preset to 10X.

Make sure that the set value of the attenuation switch in the probe is the same as the menu selection of the probe attenuation coefficient in the oscilloscope.

The set values of the probe switch are 1X and 10X (see Figure 3-8).

Figure 3-8 Attenuation Switch

When
the attenuation switch is set to 1X, the probe will limit the bandwidth of the oscilloscope in 5MHz. To use the full bandwidth of the oscilloscope, the switch must be set to 10X.

How to Use the Probe Safely

The safety guard ring around the probe body protects your finger against any electric shock, shown as Figure 3-9.

Figure 3-9 Finger Guard

To avoid electric shock, always keep your finger behind the safety guard ring of the probe during the operation.

To protect you from suffering from the electric shock, do not touch any metal part of the probe tip when it is connected to the power supply.

Before making any measurements, always connect the probe to the instrument and connect the ground terminal to the earth.

How to Implement Self-calibration

The self-calibration application can make the oscilloscope reach the optimum condition rapidly to obtain the most accurate measurement value. You can carry out this application program at any time. This program must be executed whenever the change of ambient temperature is 5℃ or over.

Before performing a self-calibration, disconnect all probes or wires from the input connector. Push the Utility button, select Function in the right menu, select Adjust. in the left menu, select Self Cal in the right menu; run the program after everything is ready.

Introduction to the Vertical System

As shown in Figure 3-10, there are a few of buttons and knobs in Vertical Controls. The following practices will gradually direct you to be familiar with the using of the vertical setting.

Figure 3-10 Vertical Control Zone

1. Use the Vertical Position knob to show the signal in the center of the waveform window. The Vertical Position knob functions the regulating of the vertical display position of the signal. Thus, when the Vertical Position knob is rotated, the pointer of the earth datum point of the channel is directed to move up and down following the waveform.

Measuring Skill

If the channel is under the DC coupling mode, you can rapidly measure the DC component of the signal through the observation of the difference between the wave form and the signal ground.

If the channel is under the AC mode, the DC component would be filtered out. This mode helps you display the AC component of the signal with a higher sensitivity.

Vertical offset back to 0 shortcut key

Turn the Vertical Position knob to change the vertical display position of channel and push the position knob to set the vertical display position back to 0 as a shortcut key, this is especially helpful when the trace position is far out of the screen and want it to get back to the screen center immediately.

2. Change the Vertical Setting and Observe the Consequent State Information Change.

With the information displayed in the status bar at the bottom of the waveform window, you can determine any changes in the channel vertical scale factor.

• Turn the Vertical
  Scale knob and change the “Vertical Scale Factor (Voltage Division)”, it can be found that the scale factor of the channel corresponding to the status bar has been changed accordingly.
  
• Push buttons of CH1, CH2 and Math, the operation menu, symbols, waveforms and scale factor status information of the corresponding channel will be displayed in the screen.
  

Introduction to the Horizontal System

Shown as Figure 3-11, there are a button and two knobs in the Horizontal
Controls. The following practices will gradually direct you to be familiar with the setting of horizontal time base.

Figure 3-11 Horizontal Control Zone

1. Turn the Horizontal Scale knob to change the horizontal time base setting and observe the consequent status information change. Turn the Horizontal Scale knob to change the horizontal time base, and it can be found that the Horizontal Time Base display in the status bar changes accordingly.
   
2. Use the Horizontal Position knob to adjust the horizontal position of the signal in the waveform window. The Horizontal Position knob is used to control the triggering displacement of the signal or for other special applications. If it is applied to triggering the displacement, it can be observed that the waveform moves horizontally with the knob when you rotate the Horizontal Position knob.
   

   Triggering displacement back to 0 shortcut key
   

   Turn the Horizontal Position knob to change the horizontal position of channel and push the Horizontal Position knob to set the triggering displacement back to 0 as a shortcut key.
   

3. Push the Horizontal HOR button to switch between the normal mode and the wave zoom mode.
   

Introduction to the Trigger System

As shown in Figure 3-12, there are one knob and three buttons make up Trigger
Controls. The following practices will direct you to be familiar with the setting of the trigger system gradually.

Figure 3-12 Trigger Control Zone

1. Push the Trigger Menu button and call out the trigger menu. With the operations of the menu selection buttons, the trigger setting can be changed.
   
2. Use the Trigger Level knob to change the trigger level setting.
   

   By turning the Trigger Level knob, the trigger indicator in the screen will move up and down. With the movement of the trigger indicator, it can be observed that the trigger level value displayed in the screen changes accordingly.
   

   Note: Turning the Trigger Level knob can change trigger level value and it is also the hotkey to set trigger level as the vertical mid point values of the amplitude of the trigger signal.
   

3. Push the Force button to force a trigger signal, which is mainly applied to the
   

   “Normal” and “Single” trigger modes.
   

4. Advanced User Guidebook

This chapter will deal with the following topics mainly:

• How to Set the Vertical System
  
• How to Set the Horizontal System
  
• How to Set the Trigger System
  
• How to Set the Sampling/Display
  
• How to Save and Recall Waveform
  
• How to Implement the Auxiliary System Function Setting
  
• How to Update your Instrument Firmware
  
• How to Measure Automatically
  
• How to Measure with Cursors
  
• How to Use Executive Buttons
  

It is recommended that you read this chapter carefully to get acquainted the various measurement functions and other operation methods of the oscilloscope.

How to Set the Vertical System

The VERTICAL CONTROLS includes three menu buttons such as CH1, CH2 and Math,
and four knobs such as Vertical Position, Vertical Scale for each channel.

Setting of CH1 and CH2

Each channel has an independent vertical menu and each item is set respectively based on the channel.

To turn waveforms on or off (channel, math)

Pushing the CH1, CH2, or Math buttons have the following effect:

• If the waveform is off, the waveform is turned on and its menu is displayed.
  
• If the waveform is on and its menu is not displayed, its menu will be displayed.
  
• If the waveform is on and its menu is displayed, the waveform is turned off and its menu goes away.
  

The description of the Channel Menu is shown as the following list:

1. To set channel coupling
   

   Taking the Channel 1 for example, the measured signal is a square wave signal containing the direct current bias. The operation steps are shown as below:
   

   1. Push the CH1 button to show the CH1 SETUP menu.
      
   2. In the right menu, select Coupling as DC. Both DC and AC components of the signal are passed.
      
   3. In the right menu, select Coupling as AC. The direct current component of the signal is blocked.
      
2. To invert a waveform
   

   Waveform inverted: the displayed signal is turned 180 degrees against the phase of the earth potential.
   

   Taking the Channel 1 for example, the operation steps are shown as follows:
   

   1. Push the CH1 button to show the CH1 SETUP menu.
      
   2. In the right menu, select Inverted as ON, the waveform is inverted. Push again to switch to OFF, the waveform goes back to its original one.
      
3. To adjust the probe attenuation
   

   For correct measurements, the attenuation coefficient settings in the operating menu of the Channel should always match what is on the probe (see “How to Set the Probe Attenuation Coefficient” on P11). If the attenuation coefficient of the probe is 1:1, the menu setting of the input channel should be set to1X.
   

   Take the Channel 1 as an example, the attenuation coefficient of the probe is 10:1, the operation steps are shown as follows:
   

   1. Push the CH1 button to show the CH1 SETUP menu.
      
   2. In the right menu, select Probe. In the left menu, turn the M knob to set it as 10X.
      
4. To measure current by probing the voltage drop across a resistor
   

   Take the Channel 1 as an example, if you are measuring current by probing the voltage drop across a 1Ω resistor, the operation steps are shown as follows:
   

   1. Push the CH1 button to show CH1 SETUP menu.
      
   2. In the right menu, set MeasCurr as Yes, the A/V radio menu will appear below. Select it; turn the M knob to set the Amps/Volts ratio. Amps/Volts ratio = 1/Resistor value. Here the A/V radio should be set to 1.
      

Use Mathematical Manipulation Function

The Mathematical Manipulation function is
used to show the results of the addition, multiplication, division and subtraction operations between two channels, or the FFT operation for a channel. Press the Math button to display the menu on the right.

The Waveform Calculation

Press the Math button to display the menu on the right, select Type as Math.

Taking the additive operation between Channel 1 and Channels 2 for example, the operation steps are as follows:

1. Press the Math button to display the math menu in the right. The pink M waveform appears on the screen.
   
2. In the right menu, select Type as Math.
   
3. In the right menu, select Factor1 as CH1.
   
4. In the right menu, select Sign as +.
   
5. In the right menu, select Factor2 as CH2.
   
6. Press Next Page in the right menu. Select Vertical (div), thesymbol is in front of div, turn the M knob to adjust the vertical position of Math waveform.
   
7. Select Vertical (V/div) in the right menu, thesymbol is in front of the voltage, turn the M knob to adjust the voltage division of Math waveform.
   

Using FFT function

The FFT (fast Fourier transform) math function mathematically converts a time-domain waveform into its frequency components. It is very useful for analyzing the input signal on Oscilloscope. You can match these frequencies with known system frequencies, such as system clocks, oscillators, or power supplies.

FFT function in this oscilloscope transforms 2048 data points of the time-domain signal into its frequency components mathematically (the record length should be 10K or above). The final frequency contains 1024 points ranging from 0Hz to Nyquist frequency.

Press the Math button to display the menu on the right, select Type as FFT.

Taking the FFT operation for example, the operation steps are as follows:

1. Press the Math button to display the math menu in the right.
   
2. In the right menu, select Type as FFT.
   
3. In the right menu, select Source as CH1.
   
4. In the right menu, select Window. Select the proper window type in the left menu.
   
5. In the right menu, select Format as Vrms or dB.
   
6. In the right menu, press Hori (Hz) to make thesymbol in front of the frequency value, turn the M knob to adjust the horizontal position of FFT waveform; then press to make thesymbol in front of the frequency/div below, turn the M knob to adjust the time base of FFT waveform.
   
7. Select Vertical in the right menu; do the same operations as above to set the vertical position and voltage division.
   

To select the FFT window

■ There are 6 FFT windows. Each one has trade-offs between frequency resolution and magnitude accuracy. What you want to measure and your source signal characteristics help you to determine which window to use. Use the following guidelines to select the best window.

Notes for using FFT

• Use the default dB scale for details of multiple frequencies, even if they have very different amplitudes. Use the Vrms scale to compare frequencies.
  
• DC component or offset can cause incorrect magnitude values of FFT waveform. To minimize the DC component, choose AC Coupling on the source signal.
  
• To reduce random noise and aliased components in repetitive or single-shot events, set the oscilloscope acquisition mode to average.
  

What is Nyquist frequency?

The Nyquist frequency is the highest frequency that any real-time digitizing oscilloscope can acquire without aliasing. This frequency is half of the sample rate. Frequencies above the Nyquist frequency will be under sampled, which causes aliasing. So pay more attention to the relation between the frequency being sampled and measured.

Use Vertical Position and Scale Knobs

1. The Vertical Position knob is used to adjust the vertical positions of the waveforms.
   

   The analytic resolution of this control knob changes with the vertical division.
   

2. The Vertical Scale knob is used to regulate the vertical resolution of the wave forms. The sensitivity of the vertical division steps as 1-2-5.
   

The vertical position and vertical resolution is displayed at the left bottom corner of the screen (see Figure 4-1).

Figure 4-1 Information about Vertical Position

How to Set the Horizontal System

The HORIZONTAL CONTROLS includes the Horizontal HOR button and such knobs as Horizontal Position and Horizontal Scale.

1. Horizontal Position knob: this knob is used to adjust the horizontal positions of all channels (include those obtained from the mathematical manipulation), the analytic resolution of which changes with the time base.
   
2. Horizontal Scale knob: it is used to set the horizontal scale factor for setting the main time base or the window.
   
3. Horizontal HOR button: push it to switch between the normal mode and the wave zoom mode. For more detailed operations, see the introductions below.
   

Zoom the Waveform

Push the Horizontal
HOR button to enter wave zoom mode. The top half of the display shows the Main window and the bottom half displays the Zoom window. The Zoom window is a magnified portion of the Main window.

Selected portion

In normal mode, the Horizontal Position and Horizontal Scale knobs are used to adjust the horizontal position and time base of the Main window.

In wave zoom mode, the Horizontal Position and Horizontal Scale knobs are used to adjust the horizontal position and time base of the Zoom window.

How to Set the Trigger System

Trigger determines when DSO starts to acquire data and display waveform. Once trigger is set correctly, it can convert the unstable display to meaningful waveform. When DSO starts to acquire data, it will collect enough data to draw waveform on left of trigger point. DSO continues to acquire data while waiting for trigger condition to occur. Once it detects a trigger it will acquire enough data continuously to draw the waveform on right of trigger point.

Trigger control area consists of 1 knob and 2 menu buttons.

Trigger Level: The knob that set the trigger level; push the knob and the level will be set as the vertical mid point values of the amplitude of the trigger signal.

Force: Force to create a trigger signal and the function is mainly used in “Normal” and “Single” mode.

Trigger Menu: The button that activates the trigger control menu.

Trigger Control

The oscilloscope provides two trigger types: single trigger, alternate trigger. Each type of trigger has different sub menus.

Single trigger: Use a trigger level to capture stable waveforms in two channels simultaneously.

Alternate trigger: Trigger on non-synchronized signals.

The Single Trigger, Alternate Trigger menus are described respectively as follows:

Single Trigger

Single trigger has two types: edge trigger, video trigger.

Edge Trigger: It occurs when the trigger input passes through a specified voltage level with the specified slope.

Video Trigger: Trigger on fields or lines for standard video signal.

The two trigger modes in Single Trigger are described respectively as follows:

1. Edge Trigger

An edge trigger occurs on trigger level value of the specified edge of input signal. Select Edge trigger mode to trigger on rising edge or falling edge.

Push the Trigger Menu button to display the Trigger
menu on the right. Select Type as Single in the right menu. Select Single as Edge in the right menu.

In Edge Trigger mode, the trigger setting information is displayed on bottom right of the

screen, for example,     indicates that trigger type is edge, trigger

source is CH1, coupling is DC, and trigger level is 0.00mV.

Edge menu list:

Trigger Level: trigger level indicates vertical trig position of the channel, rotate trig level knob to move trigger level, during setting, a dotted line displays to show trig position, and the value of trigger level changes at the right corner, after setting, dotted line disappears.

2. Video Trigger

Choose video trigger to trigger on fields or lines of NTSC, PAL or SECAM standard video signals.

Push the Trigger Menu button to display the Trigger
menu on the right. Select Type as Single in the right menu. Select Single as Video in the right menu.

In Video Trigger mode, the trigger setting information is displayed on bottom right of the screen, for example, indicates that trigger type is Video, trigger source is

CH1, and Sync type is Even.

Video Trigger menu list:

Alternate Trigger (Trigger mode: Edge)

Trigger signal comes from two vertical channels when alternate trigger is on. This mode is used to observe two unrelated signals. Trigger mode is edge trigger.

Alternate trigger (Trigger Type: Edge)
menu list:

How to Operate the Function Menu

The function menu control zone includes 4 function menu buttons: Utility, Measure, Acquire, Cursor, and 2 immediate-execution buttons: Autoset, Run/Stop.

How to Set the Sampling/Display

Push the Acquire button, the Sampling and Display menu is shown in the right as follows:

Average

Normal sampling mode.

Use to capture maximal and minimal samples. Finding highest and lowest points over adjacent intervals. It is used for the detection of the jamming burr and the possibility of reducing the confusion.

It is used to reduce the random and don’t-care noises, with the optional number of averages. Turn the M knob to select 4, 16, 64, 128 in the left menu.

Type

Dots

Vect

Only the sampling points are displayed.

The space between the adjacent sampling points in the display is filled with the vector form.

Persist

OFF

1. Second
   
2. Seconds
   

5 Seconds

Infinity

Set the persistence time

XY Mode

ON

OFF

Turn on/off XY display function

Counter

ON

OFF

Turn on/off counter

 

Persist

When the Persist function is used, the persistence display effect of the picture tube oscilloscope can be simulated. The reserved original data is displayed in fade color and the new data is in bright color.

1. Push the Acquire button.
   
2. In the right menu, press Persist to select the persist time, including OFF, 1 Second, 2 Seconds, 5 Seconds and Infinity.
   When the “Infinity” option is set for Persist
   Time, the measuring points will be stored till the controlling value is changed. Select OFF to turn off persistence and clear the display.
   

XY Format

This format is only applicable to Channel 1 and Channel 2. After the XY display format is selected, Channel 1 is displayed in the horizontal axis and Channel 2 in the vertical axis; the oscilloscope is set in the un-triggered sample mode: the data are displayed as bright spots.

The operations of all control knobs are as follows:

• The Vertical Scale and the Vertical Position knobs of Channel 1 are used to set the horizontal scale and position.
  
• The Vertical Scale and the Vertical Position knobs
  of Channel 2 are used to set the vertical scale and position continuously.
  

The following functions can not work in the XY Format:

• Reference or digital wave form
  
• Cursor
  
• Trigger control
  
• FFT
  

Operation steps:

1. Push the Acquire button to show the right menu.
   
2. Select XY Mode as ON or OFF in the right menu.
   

Counter

It is a 6-digit single-channel counter. The counter can only measure the frequency of the triggering channel. The frequency range is from 2Hz to the full bandwidth. Only if the measured channel is in Edge mode of Single trigger type, the counter can be enabled. The counter is displayed at the bottom of the screen.

Operation steps:

1. Push Trigger Menu button, set the trigger type to Single, set the trigger mode to Edge, select the signal source.
   
2. Push the Acquire button to show the right menu.
   
3. Select Counter as ON or OFF in the right menu.
   

How to Save and Recall a Waveform

Push the Utility button, select Function in the right menu, select Save in the left menu.

By selecting Type in the right menu, you can save the waveforms, configures or screen images.

When the Type is selected as Wave, the menu is shown as the following table:

When the Type is selected as Configure, the menu is shown as the following table:

When the Type is selected as Image, the menu is shown as the following table:

Save and Recall the Waveform

The oscilloscope can store 16 waveforms, which can be displayed with the current waveform at the same time. The stored waveform called out can not be adjusted.

In order to save the waveform of CH1, CH2 and Math into the address 1, the operation steps should be followed:

1. Turn on CH1, CH2 and Math channels.
   
2. Push the Utility button, select Function in the right menu, select Save in the left menu. In the right menu, select Type as Wave.
   
3. Saving: In the right menu, select Source as All.
   
4. In the right menu, press Object. Select 1 as object address in the left menu.
   
5. In the right menu, press Next Page, and select Storage as Internal.
   
6. In the right menu, press Save to save the waveform.
   
7. Recalling: In the right menu, press Prev Page, and press Object, select 1 in the left menu. In the right menu, select Object as ON, the waveform stored in the address will be shown, the address number and relevant information will be displayed at the top left of the screen.
   

In order to save the waveform of CH1 and CH2 into the USB storage as a BIN file, the operation steps should be followed:

1. Turn on CH1 and CH2 channels, turn off the Math channel.
   
2. Push the Utility button, select Function in the right menu, select Save in the left menu. In the right menu, select Type as Wave.
   
3. Saving: In the right menu, select Source as All.
   
4. In the right menu, press Next Page, and select File Format as BIN.
   
5. In the right menu, select Storage as External.
   
6. In the right menu, select Storage, an input keyboard used to edit the file name will pop up. The default name is current system date and time. Turn the M knob to choose the keys; press the M knob to input the chosen key. The length of file name is up to 25 characters. Select the key in the keyboard to confirm.
   
7. Recalling: The BIN waveform file could be open by OWON waveform analysis software (on the supplied CD).
   

Shortcut for Save
function:

The Copy button on the bottom right of the front panel is the shortcut for Save function in the Utility function menu. Pressing this button is equal to the Save option in the Save menu. The waveform, configure or the display screen could be saved according to the chosen type in the Save menu.

Save the current screen image:

The screen image can only be stored in USB disk, so you should connect a USB disk with the instrument.

1. Install the USB disk: Insert the USB disk into the “7. USB Host port” of “Figure 3-1 Front panel“. If an icon appears on the top right of the screen, the USB disk is installed successfully. If the USB disk cannot be recognized, format the USB disk according to the methods in “USB disk Requirements” on P31.
   
2. After the USB disk is installed, push the Utility button, select Function in the right menu, select Save in the left menu. In the right menu, select Type as Image.
   
3. Select Save in the right menu, an input keyboard used to edit the file name will pop up. The default name is current system date and time. Turn the M knob to choose the keys; press the M knob to input the chosen key. The length of file name is up to 25 characters. Select the key in the keyboard to confirm.
   

USB disk Requirements

The supported format of the USB disk: FAT32 file system, the allocation unit size cannot exceed 4K, mass storage USB disk is also supported. If the USB disk doesn’t work properly, format it into the supported format and try again. Follow any of the following two methods to format the USB disk: using system-provided function and using the formatting tools. (The USB disk of 8 G or 8 G above can only be formatted using the second method – using the formatting tools.)

Use system-provided function to format the USB disk

1. Connect the USB disk to the computer.
   
2. Right click Computer- Manage to enter Computer Management interface.
   
3. Click Disk Management menu, and information about the USB disk will display on the right side with red mark 1 and 2.
   

Figure 4-2: Disk Management of computer

1. Right click 1 or 2 red mark area, choose Format. And system will pop up a warning message, click Yes.
   

Figure 4-3: Format the USB disk warning

1. Set File System as FAT32, Allocation unit size 4096. Check “Perform a quick
   format” to execute a quick format. Click OK, and then click Yes on the warning message.
   

   
   

Figure 4-4: Formatting the USB disk setting 6. Formatting process.

Figure 4-5: Formatting the USB disk

7.     Check whether the USB disk is FAT32 with allocation unit size 4096 after formatting.

Use Minitool Partition Wizard to format

Download URL:
http://www.partitionwizard.com/free-partition-manager.html

Tip: There are many tools for the USB disk formatting on the market, just take Minitool Partition Wizard for example here.

1. Connect the USB disk to the computer.
   
2. Open the software Minitool Partition Wizard.
   
3. Click Reload Disk on the pull-down menu at the top left or push keyboard F5, and information about the USB disk will display on the right side with red mark 1 and 2.
   

   
   

Figure 4-6: Reload Disk 4. Right click 1 or 2 red mark area, choose Format.

Figure 4-7: Choose format 5. Set File System FAT32, Cluster size 4096. Click OK.

Figure 4-8: Format setting

1. Click Apply at the top left of the menu. Then click Yes on the pop-up warning to begin formatting.
   

Figure 4-9: Apply setting

1. Formatting process
   

   
   

Figure 4-10: Format process

1. Format the USB disk successfully
   

Figure 4-11: Format successfully

How to Implement the Auxiliary System Function Setting

●Config

Push the Utility button, select Function in the right menu, select Configure in the left menu.

The description of Configure Menu is shown as the follows:

●Display

Push the Utility button, select Function in the right menu, select Display in the left menu.

The description of Display
Menu is shown as the follows:

●Adjust

Push the Utility button, select Function in the right menu, select Adjust in the left menu.

The description of Adjust
Menu is shown as the follows:

Do Self Cal (Self-Calibration)

The self-calibration procedure can improve the accuracy of the oscilloscope under the ambient temperature to the greatest extent. If the change of the ambient temperature is up to or exceeds 5℃, the self-calibration procedure should be executed to obtain the highest level of accuracy.

Before executing the self-calibration procedure, disconnect all probes or wires from the input connector. Push the Utility button, select Function in the right menu, the function menu will display at the left, select Adjust. If everything is ready, select Self Cal in the right menu to enter the self-calibration procedure of the instrument.

Probe checking

To check whether probe attenuation is good. The results contain three circumstances: Overflow compensation, Good compensation, Inadequate compensation. According to the checking result, users can adjust probe attenuation to the best. Operation steps are as follows:

1. Connect the probe to CH1, adjust the probe attenuation to the maximum.
   
2. Push the Utility button, select Function in the right menu, select Adjust in the left menu.
   
3. Select ProbeCh. in the right menu, tips about probe checking shows on the screen.
   
4. Select ProbeCh. again to begin probe checking and the checking result will occur after 3s; push any other key to quit.
   

● Save

You can save the waveforms, configures or screen images. Refer to “How to Save and Recall a Waveform” on page 28.

● Update

Use the front-panel USB port to update your instrument firmware using a USB memory device. Refer to “How to Update your Instrument Firmware” on page 37.

How to Update your Instrument Firmware

Use the front-panel USB port to update your instrument firmware using a USB memory device.

USB memory device requirements: Insert a USB memory device into the USB port on the front panel. If the icon appears on the top right of the screen, the USB memory

device is installed successfully. If the USB memory device cannot be detected, format the USB memory device according to the methods in “USB disk Requirements” on P31.

Caution: Updating your instrument firmware is a sensitive operation, to prevent damage to the instrument, do not power off the instrument or remove the USB memory device during the update process.

To update your instrument firmware, do the following:

1. Push the Utility button, select Function in the right menu, select Configure in the left menu, select About in the right menu. View the model and the currently installed firmware version.
   
2. From a PC, visit www.owon.com.cn and check if the website offers a newer firmware version. Download the firmware file. The file name must be Scope.update. Copy the firmware file onto the root directory of your USB memory device.
   
3. Insert the USB memory device into the front-panel USB port on your instrument.
   
4. Push the Utility button, select Function in the right menu, select Update in the left menu.
   
5. In the right menu, select Start, the messages below will be shown.
   

1. In the right menu, select Start again, the interfaces below will be displayed in sequence. The update process will take up to three minutes. After completion, the instrument will be shut down automatically.
   

   
   

2. Press the
   button to power on the instrument.
   

How to Measure Automatically

Push the Measure button to display the menu for the settings of the Automatic Measurements. At most 8 types of measurements could be displayed on the bottom left of the screen.

The oscilloscopes provide 30 parameters for auto measurement, including Period,

Frequency, Mean, PK-PK, RMS, Max, Min, Top, Base, Amplitude, Overshoot, Preshoot,

Rise Time, Fall Time, +PulseWidth, -PulseWidth, +Duty Cycle, -Duty Cycle, Delay A→B, Delay A→B, Cycle RMS, Cursor RMS, Screen Duty, Phase, +PulseCount, -PulseCount, RiseEdgeCnt, FallEdgeCnt, Area, and Cycle Area.

The “Automatic Measurements” menu is described as the following table:

Measure

Only if the waveform channel is in the ON state, the measurement can be performed. The automatic measurement can not be performed in the following situation: 1) On the saved waveform. 2) On the Dual Wfm Math waveform. 3) On the Video trigger mode.

On the Scan format, period and frequency can not be measured.

Measure the period, the frequency of the CH1, following the steps below:

1. Push the Measure button to show the right menu.
   
2. Select AddCH1 in the right menu.
   
3. In the left Type menu, turn the M knob to select Period.
   
4. In the right menu, select AddCH1. The period type is added.
   
5. In the left Type menu, turn the M knob to select Frequency.
   
6. In the right menu, select AddCH1. The frequency type is added.
   

The measured value will be displayed at the bottom left of the screen automatically (see Figure 4-12).

Figure 4-12 Automatic measurement

The automatic measurement of voltage parameters

The oscilloscopes provide automatic voltage measurements including Mean, PK-PK, RMS, Max, Min, Vtop, Vbase, Vamp, OverShoot, PreShoot, Cycle RMS, and Cursor

RMS. Figure 4-13 below shows a pulse with some of the voltage measurement points.

Figure 4-13

Mean: The arithmetic mean over the entire waveform.

PK-PK: Peak-to-Peak Voltage.

RMS: The true Root Mean Square voltage over the entire waveform.

Max: The maximum amplitude. The most positive peak voltage measured over the entire waveform.

Min: The minimum amplitude. The most negative peak voltage measured over the entire waveform.

Vtop: Voltage of the waveform’s flat top, useful for square/pulse waveforms.

Vbase: Voltage of the waveform’s flat base, useful for square/pulse waveforms.

Vamp: Voltage between Vtop and Vbase of a waveform.

OverShoot: Defined as (Vmax-Vtop)/Vamp, useful for square and pulse waveforms.

PreShoot: Defined as (Vmin-Vbase)/Vamp, useful for square and pulse waveforms.

Cycle RMS: The true Root Mean Square voltage over the first entire period of the waveform.

Cursor RMS: The true Root Mean Square voltage over the range of two cursors.

The automatic measurement of time parameters

The oscilloscopes provide time parameters auto-measurements include Period, Frequency, Rise Time, Fall Time, +D width, -D width, +Duty, -Duty, Delay A→B, Delay A→B, and Duty cycle.

Figure 4-14 shows a pulse with some of the time measurement points.

Figure 4-14

Rise Time: Time that the leading edge of the first pulse in the waveform takes to rise from 10% to 90% of its amplitude.

Fall Time: Time that the falling edge of the first pulse in the waveform takes to fall from 90% to 10% of its amplitude.

+D width: The width of the first positive pulse in 50% amplitude points.

-D width: The width of the first negative pulse in the 50% amplitude points.

+Duty: +Duty Cycle, defined as +Width/Period.

-Duty:-Duty Cycle, defined as -Width/Period.

Delay A→B: The delay between the two channels at the rising edge.

Delay A→B: The delay between the two channels at the falling edge.

Screen Duty: Defines as (the width of the positive pulse)/(Entire period)

Phase: Compare the rising edge of CH1 and CH2, calculate phase difference of two channels.

Phase difference=(Delay between channels at the rising edge÷Period)×360°.

Other measurements

+PulseCount : The number of positive pulses that rise above the mid reference crossing in the waveform.

-PulseCount : The number of negative pulses that fall below the mid reference crossing in the waveform.

RiseEdgeCnt : The number of positive transitions from the low reference value to the high reference value in the waveform.

FallEdgeCnt : The number of negative transitions from the high reference value to the low reference value in the waveform.

Area: The area of the whole waveform within the screen and the unit is voltage-second. The area measured above the zero reference (namely the vertical offset) is positive; the area measured below the zero reference is negative. The area measured is the algebraic sum of the area of the whole waveform within the screen.

Cycle Area: The area of the first period of waveform on the screen and the unit is voltage-second. The area above the zero reference (namely the vertical offset) is positive and the area below the zero reference is negative. The area measured is the algebraic sum of the area of the whole period waveform.

Note: When the waveform on the screen is less than a period, the period area measured is 0.

How to Measure with Cursors

Push the Cursor button to turn cursors on and display the cursor menu. Push it again to turn cursors off.

The Cursor Measurement for normal mode:

The description of the cursor menu is shown as the following table:

Perform the following operation steps for the time and voltage cursor measurement of the channel CH1:

1. Push Cursor to display the cursor menu.
   
2. In the right menu, select Source as CH1.
   
3. Press the first menu item in the right menu, select Time&Voltage for Type, two blue dotted lines displayed along the horizontal direction of the screen, two blue dotted lines displayed along the vertical direction of the screen. Cursor measure window at the left bottom of the screen shows the cursor readout.
   
4. In the right menu, select Line Type as Time to make the vertical cursors active. If the Line in the right menu is select as a, turn the M knob to move line a to the right or left. If b is selected, turn the M knob to move line b.
   
5. In the right menu, select Line Type as Voltage to make the horizontal cursors active. Select Line in the right menu as a or b, turn the M knob to move it.
   
6. Push the
   horizontal HOR button to enter wave zoom mode. Push Cursor to show the right menu, select Window as Main or Extension to make the cursors shown in the main window or zoom window.
   

Figure 4-15 Time&Voltage Cursor Measurement

Auto Cursor

For the AutoCursr type, the horizontal cursors are set as the intersections of the vertical cursors and the waveform.

The Cursor Measurement for FFT mode

In FFT mode, push the Cursor button to turn cursors on and display the cursor menu.

The description of the cursor menu in FFT mode is shown as the following table:

Perform the following operation steps for the amplitude and frequency cursor measurement of math FFT:

1. Press the Math button to display the right menu. Select Type as FFT.
   
2. Push Cursor to display the cursor menu.
   
3. In the right menu, select Window as Extension.
   
4. Press the first menu item in the right menu, select Freq&Vamp for Type, two blue dotted lines displayed along the horizontal direction of the screen, two blue dotted lines displayed along the vertical direction of the screen. Cursor measure window at the left bottom of the screen shows the cursor readout.
   
5. In the right menu, select Line Type as Freq to make the vertical cursors active. If the Line in the right menu is select as a, turn the M knob to move line a to the right or left. If b is selected, turn the M knob to move line b.
   
6. In the right menu, select Line Type as Vamp to make the horizontal cursors active. Select Line in the right menu as a or b, turn the M knob to move it.
   
7. In the right cursor menu, you can select Window as Main to make the cursors shown in the main window.
   

How to Use Executive Buttons

Executive Buttons include Autoset, Run/Stop, Copy.

 [Autoset] button

It’s a very useful and quick way to apply a set of pre-set functions to the incoming signal, and display the best possible viewing waveform of the signal and also works out some measurements for user as well.

The details of functions applied to the signal when using Autoset are shown as the following table:

Judge waveform type by Autoset

Five kinds of types: Sine, Square, video signal, DC level, Unknown signal.

Menu as follow:

Description for some icons:

    Multi-period     To display multiple periods

    Single-period         To display single period

    FFT         Switch to FFT mode

    Rising Edge         Display the rising edge of square waveform

    Falling Edge         Display the falling edge of square waveform

    Cancel Autoset    Go back to display the upper menu and waveform information

Note: The Autoset
function requires that the frequency of signal should be no lower

than 20Hz, and the amplitude should be no less than 5mv. Otherwise, the Autoset function may be invalid.

 [Run/Stop] button

Enable or disable sampling on input signals.

Notice: When there is no sampling at STOP state, the vertical division and the horizontal time base of the waveform still can be adjusted within a certain range, in other words, the signal can be expanded in the horizontal or vertical direction. When the horizontal time base is 50ms, the horizontal time base can be expanded for 4 divisions downwards.

 [Copy] button

This button is the shortcut for Save function in the Utility function menu. Pressing this button is equal to the Save option in the Save menu. The waveform, configure or the display screen could be saved according to the chosen type in the Save menu. For more details, please see “How to Save and Recall a Waveform” on P28.

5.Communication with PC

5. Communication with PC

The oscilloscope supports communications with a PC through USB. You can use the Oscilloscope communication software to store, analyze, display the data and remote control.

To learn about how to operate the software, you can push F1 in the software to open the help document.

Here is how to connect with PC via USB port.

1. Install the software: Install the Oscilloscope communication software on the supplied CD.
   
2. Connection: Use a USB data cable to connect the USB Device port in the right panel of the Oscilloscope to the USB port of a PC.
   
3. Install the driver: Run the Oscilloscope communication software on PC, push F1 to open the help document. Follow the steps of title “I. Device connection” in the document to install the driver.
   
4. Port setting of the software: Run the Oscilloscope software; click “Communications” in the menu bar, choose “Ports-Settings”, in the setting dialog, choose “Connect using” as “USB”. After connect successfully, the connection information in the bottom right corner of the software will turn green.
   

Figure 5-1 Connect with PC through USB port

6. Demonstration

Example 1: Measurement a Simple Signal

The purpose of this example is to display an unknown signal in the circuit, and measure the frequency and peak-to-peak voltage of the signal.

    1.     Carry out the following operation steps for the rapid display of this signal:

1. Set the probe menu attenuation coefficient as 10X and that of the switch in the probe switch as 10X (see “How to Set the Probe Attenuation Coefficient” on P11).
   
2. Connect the probe of Channel 1 to the measured point of the circuit.
   
3. Push the Autoset button.
   

The oscilloscope will implement the Autoset to make the waveform optimized, based on which, you can further regulate the vertical and horizontal divisions till the waveform meets your requirement.

    2.     Perform Automatic Measurement

The oscilloscope can measure most of the displayed signals automatically. To measure the period, the frequency of the CH1, following the steps below:

1. Push the Measure button to show the right menu.
   
2. Select AddCH1 in the right menu.
   
3. In the left Type menu, turn the M knob to select Period.
   
4. In the right menu, select AddCH1. The period type is added.
   
5. In the left Type menu, turn the M knob to select Frequency.
   
6. In the right menu, select AddCH1. The frequency type is added.
   

The measured value will be displayed at the bottom left of the screen automatically (see Figure 6-1).

Figure 6-1 Measure period and frequency value for a given signal

Example 2: Gain of a Amplifier in a Metering Circuit

The purpose of this example is to work out the Gain of an Amplifier in a Metering Circuit. First we use Oscilloscope to measure the amplitude of input signal and output signal from the circuit, then to work out the Gain by using given formulas.

Set the probe menu attenuation coefficient as 10X and that of the switch in the probe as 10X (see “How to Set the Probe Attenuation Coefficient” on P11).

Connect the oscilloscope CH1 channel with the circuit signal input end and the CH2 channel to the output end.

Operation Steps:

1. Push the Autoset button and the oscilloscope will automatically adjust the waveforms of the two channels into the proper display state.
   
2. Push the Measure button to show the right menu.
   
3. Select AddCH1 in the right menu.
   
4. In the left Type menu, turn the M knob to select PK-PK.
   
5. In the right menu, select AddCH1. The peak-to-peak type of CH1 is added.
   
6. In the right menu, select AddCH2. The peak-to-peak type of CH2 is added.
   
7. Read the peak-to-peak voltages of Channel 1 and Channel 2 from the bottom left of the screen (see Figure 6-2).
   
8. Calculate the amplifier gain with the following formulas.
   

   Gain = Output Signal / Input signal
   

   Gain (db) = 20×log (gain)
   

Figure 6-2 Waveform of Gain Measurement

Example 3: Capturing a Single Signal

It’s quite easy to use Digital Oscilloscope to capture non-periodic signal, such as a pulse and burr etc. But the common problem is how to set up a trigger if you have no knowledge of the signal? For example, if the pulse is the logic signal of a TTL level, the trigger level should be set to 2 volts and the trigger edge be set as the rising edge trigger. With various functions supported by our Oscilloscope, user can solve this problem by taking an easy approach. First to run your test using auto trigger to find out the closest trigger level and trigger type, this helps user to make few small adjustments to achieve a proper trigger level and mode. Here is how we achieve this.

The operation steps are as follows:

1. Set the probe menu attenuation coefficient to 10X and that of the switch in the probe to 10X
   (see “How to Set the Probe Attenuation Coefficient” on P11).
   
2. Adjust the Vertical
   Scale and Horizontal Scale knobs to set up a proper vertical and horizontal ranges for the signal to be observed.
   
3. Push the Acquire button to display the right menu.
   
4. In the right menu, select Acqu Mode as Peak Detect.
   
5. Push the Trigger Menu button to display the right
   menu.
   
6. In the right menu, select Type as Single.
   
7. In the right menu, select Single as Edge.
   
8. In the right menu, select Source as CH1.
   
9. In the right menu, press Next Page, select Coupling as DC.
   
10. In the right menu, select Slope as (rising).
    
11. Turn the Trigger Level knob and adjust the trigger level to the roughly 50% of the signal to be measured.
    
12. Check the Trigger State Indicator on the top of the screen, if it is not Ready, push down the Run/Stop button and start acquiring, wait for trigger to happen. If a signal reaches to the set trigger level, one sampling will be made and then displayed in the screen. By using this approach, a random pulse can be captured easily. For instance, if we want to find a burst burr of high amplitude, set the trigger level to a slightly higher value of the average signal level, push the Run/Stop button and wait a trigger. Once there is a burr occurring, the instrument will trigger automatically and record the waveform during the period around the trigger time. By turning the Horizontal Position knob in the horizontal control area in the panel, you can change the horizontal triggering position to obtain the negative delay, making an easy observation of the waveform before the burr occurs (see Figure 6-3).
    

Figure 6-3 Capturing a Single Signal

Example 4: Analyze the Details of a Signal

Noise is very common inside most of the electronic signal. To find out what’s inside the noise and reduce the level of noise is very important function our oscilloscope is capable to offer.

Noise Analysis

The level of noise sometime indicates a failure of electronic circuit. The Peak Detect functions acts an important role to help you to find out the details of these noise. Here is how we do it:

1. Push the Acquire button to display the right
   menu.
   
2. In the right menu, select Acqu Mode as Peak Detect.
   

The signal displayed on the screen containing some noise, by turning on Peak Detect function and changing time base to slow down the incoming signal, any peaks or burr would be detected by the function (see Figure 6-4).

Figure 6-4 Signal with Noises

Separate Noises from the Signal

When focusing on signal itself, the important thing is to reduce the noise level as lower as possible, this would enable user to have more details about the signal. The Average function offered by our Oscilloscope can help you to achieve this.

Here are the steps for how to enable Average function.

1. Push the Acquire button to display the right menu.
   
2. In the right menu, select Acqu Mode as Average.
   
3. Turn the M knob and observe the waveform obtained from averaging the waveforms of different average number.
   

User would see a much reduced random noise level and make it easy to see more details of the signal itself. After applying Average, user can easily identify the burrs on the rising and falling edges of some part of the signal (see Figure 6-5).

Figure 6-5 Reduce Noise level by using Average function

Example 5: Application of X-Y Function

Examine the Phase Difference between Signals of two Channels

Example: Test the phase change of the signal after it passes through a circuit network.

X-Y mode is a very useful when examining the Phase shift of two related signals. This example takes you step by step to check out the phase change of the signal after it passes a specified circuit. Input signal to the circuit and output signal from circuit are used as source signals.

For the examination of the input and output of the circuit in the form of X-Y coordinate graph, please operate according to the following steps:

1. Set the probe menu attenuation coefficient for 10X and that of the switch in the probe for 10X (see “How to Set the Probe Attenuation Coefficient” on P11).
   
2. Connect the probe of channel 1 to the input of the network and that of Channel 2 to the output of the network.
   
3. Push the Autoset button, with the oscilloscope turning on the signals of the two channels and displaying them in the screen.
   
4. Turn the Vertical
   Scale knob, making the amplitudes of two signals equal in the rough.
   
5. Push the Acquire button to display the right menu.
   
6. In the right menu, select XY Mode as ON. The oscilloscope will display the input and terminal characteristics of the network in the Lissajous graph form.
   
7. Turn the Vertical Scale and Vertical Position knobs, optimizing the waveform.
   
8. With the elliptical oscillogram method adopted, observe and calculate the phase difference (see Figure 6-6).
   

   
   

Figure 6-6 Lissajous Graph

Based on the expression sin (q) =A/B or C/D, thereinto, q is the phase difference angle, and the definitions of A, B, C, and D are shown as the graph above. As a result, the phase difference angle can be obtained, namely, q =± arcsin (A/B) or ± arcsin (C/D). If the principal axis of the ellipse is in the I and III quadrants, the determined phase difference angel should be in the I and IV quadrants, that is, in the range of (0 – π /2) or (3π / 2 – 2π). If the principal axis of the ellipse is in the II and IV quadrants, the determined phase difference angle is in the II and III quadrants, that is, within the range of (π / 2 – π) or (π – 3π /2).

Example 6: Video Signal Trigger

Observe the video circuit of a television, apply the video trigger and obtain the stable video output signal display.

Video Field Trigger

For the trigger in the video field, carry out operations according to the following steps:

1. Push the Trigger Menu button to display the right menu.
   
2. In the right menu, select Type as Single.
   
3. In the right menu, select Single as Video.
   
4. In the right menu, select Source as CH1.
   
5. In the right menu, select Modu as NTSC.
   
6. In the right menu, press Next Page, select Sync as Field.
   
7. Turn the Vertical Scale, Vertical Position and Horizontal Scale knobs to obtain a proper waveform display (see Figure 6-7).
   

Figure 6-7 Waveform Captured from Video Field Trigger

7.Troubleshooting

7. Troubleshooting

• Oscilloscope is powered on but no Display.
  
  • Check whether the power connection is connected properly.
    
  • Restart the instrument after completing the checks above.
    
  • If the problem persists, please contact OWON and we will be under your service.
    
• After acquiring the signal, the waveform of the signal is not displayed in the screen.
  
  • Check whether the probe is properly connected to the signal connecting wire.
    
  • Check whether the signal connecting wire is correctly connected to the BNC (namely, the channel connector).
    
  • Check whether the probe is properly connected with the object to be measured.
    
  • Check whether there is any signal generated from the object to be measured (the trouble can be shot by the connection of the channel from which there is a signal generated with the channel in fault).
    
  • Make the signal acquisition operation again.
    
• The measured voltage amplitude value is 10 times or 1/10 of the actual value.
  

Look at the attenuation coefficient for the input channel and the attenuation ration of the probe, to make sure they are match
(see “How to Set the Probe Attenuation Coefficient” on P11).

• There is a waveform displayed, but it is not stable.
  
  • Check whether the Source item in the TRIG MODE menu is in conformity with the signal channel used in the practical application.
    
  • Check on the trigger Type item: The common signal chooses the Edge trigger mode for Type and the video signal the Video. If Alternate trigger is selected, both of the channel 1 and channel 2 trigger levels should be adjusted to the proper position. Only if a proper trigger mode is applied, the waveform can be displayed steadily.
    
• No Display Responses to the Push-down of Run/Stop.
  

  Check whether Normal or Signal is chosen for Polarity in the TRIG MODE menu and the trigger level exceeds the waveform range.
  

  If it is, make the trigger level is centered in the screen or set the trigger mode as Auto. In addition, with the Autoset button pressed, the setting above can be completed automatically.
  

• The displaying of waveform seems getting slow after increasing AVERAGE value in Acqu Mode (see “How to Set the Sampling/Display” on P27 ), or a longer duration is set in the Persist in Display (see “Persist” on P27).
  

  It’s normal as the Oscilloscope is working hard on many more data points.
  

8. Technical Specifications

Unless otherwise specified, the technical specifications applied are for the oscilloscope only, and Probes attenuation set as 10X. Only if the oscilloscope fulfills the following two conditions at first, these specification standards can be reached.

• This instrument should run for at least 30 minutes continuously under the specified operating temperature.
  
• If change of the operating temperature is up to or exceeds 5℃, do a “Self-calibration” procedure (see “How to Implement Self-calibration” on P12).
  

All specification standards can be fulfilled, except one(s) marked with the word “Typical”.

Trigger:

General Technical Specifications

Display

Output of the Probe Compensator

Power

Environment

Mechanical Specifications

Interval Period of Adjustment:

One year is recommended for the calibration interval period.

9.Appendix

9. Appendix

Appendix A: Enclosure

(The accessories subject to final delivery.)

Standard Accessories:

Power Cord     CD Rom     Quick Guide     USB Cable     Probe

Probe Adjust

Options:

Soft Bag

Appendix B: General Care and Cleaning

General Care

Do not store or leave the instrument where the liquid crystal display will be exposed to direct sunlight for long periods of time.

Caution: To avoid any damage to the instrument or probe, do not exposed it to any sprays, liquids, or solvents.

Cleaning

Inspect the instrument and probes as often as operating conditions require. To clean the instrument exterior, perform the following steps:

1. Wipe the dust from the instrument and probe surface with a soft cloth. Do not make any scuffing on the transparent LCD protection screen when clean the LCD screen.
   

9.Appendix

1. Disconnect power before cleaning your Oscilloscope. Clean the instrument with a wet soft cloth not dripping water. It is recommended to scrub with soft detergent or fresh water. To avoid damage to the instrument or probe, do not use any corrosive chemical cleaning agent.
   

Warning: Before power on again for operation, it is required to confirm that

the instrument has already been dried completely, avoiding any electrical short circuit or bodily injury resulting form the moisture.