Additional Information

Oscilloscope Setup

• Auto set

This function can be used to adjust the horizontal and vertical scales of the Oscilloscope automatically and set the trigger coupling, type, position, slope, level and modes to acquire a stable waveform display.

• Trigger

The Trigger determines when the oscilloscope begins to acquire data and display a waveform, once a trigger is properly set up, the oscilloscope can convert unstable displays or blank screens to meaningful waveforms. Some basic concepts of a Trigger

Trigger Types

• Edge Trigger uses the analog or digital test circuits for triggering. It happens when the input trigger source crosses a specified level in a specified direction
• Video Trigger performs a field or line trigger through standard video signals
• Pulse Width Trigger can trigger normal or abnormal pulses that meet trigger conditions
• Slope Trigger uses the rises and fall times on the edge of signal for triggering
• Overtime Trigger happens after the edge of signal reaches the set time
• Alter Trigger it uses a specific frequency to switch between two analog channels CH1 and CH2 so that the channels will generate alter trigger signals through the trigger circuitry
• Trigger Mode One can select the Auto or Normal mode to define how the oscilloscope acquires data when it does not detect a trigger condition. Auto Mode performs the acquisition freely in absence of valid trigger.
• Trigger Coupling determines which part of the signal will be delivered to the trigger circuit. This can help to obtain a stable display of the waveform
• Trigger Position The horizontal position control establishes the time between the trigger position and the screen center.
• Slope and Level The slope and level controls help to define the trigger. The slopes option determines whether the trigger point is on the rising or falling edge of a signal

Specifications of Trigger

Trigger System
Trigger Type	Edge, Video, Pulse, Slope, Over time, Alternative
Trigger Source	CH1, CH2, AC Line
Trigger Modes	Auto, Normal, Single
Coupling Type	DC, AC, HF Reject, LF Reject, Noise Reject
Trigger Sensitivity (Edge Trigger Type)	DC(CH1,CH2): 1div from DC to 10 MHz; 1.5 div from 10 MHz to 100 MHz; 2div from 100 MHz to full; AC: Attenuates signals below 10 Hz ; HF Reject: Attenuates signals above 80 kHz; LF Reject: Same as the DC-coupled limits for frequencies above 150kHz; attenuates signals below 150kHz.
Trigger Level Range	CH1/CH2: ±8 divisions from center of screen
Trigger Level Accuracy (typical)Accuracy is for signals having rise and fall times ≥20ns	CH1/CH2: 0.2div × volts/div within ±4 divisions from center of screen
Set Level to 50%(typical)	Operates with input signals ≥50 Hz
Video Trigger
Video Trigger Type	CH1, CH2: Peak-to-peak amplitude of 2 divisions;
Signal Formats and Field Rates	Supports NTSC, PAL and SECAM broadcast systems for any field or any line
Hold off Range	100ns to 10s
Pulse Width Trigger
Pulse Width Trigger Mode	Trigger when (<, >, =, or ≠); Positive pulse or Negative pulse
Pulse Width Trigger Point	Equal: The oscilloscope triggers when the trailing edge of the pulse crosses the trigger level. Not Equal: If the pulse is narrower than the specified width, the trigger point is the trailing edge. Otherwise, the oscilloscope triggers when a pulse continues longer than the time specified as the Pulse Width. Less than: The trigger point is the trailing edge. Greater than (also called overtime trigger): The oscilloscope triggers when a pulse continues longer than the time specified as the Pulse Width
Time Range	20ns to 10s
Slope Trigger
Slope Trigger Mode	Trigger when < (Less than) > (Greater than), = (Equal), or not equal; Positive slope or Negative slope
Slope Trigger Point	Equal: The oscilloscope triggers when the waveform slope is equal to the set slope Not Equal: The oscilloscope triggers when the waveform slope is not equal to the set slope Less than: The oscilloscope triggers when the waveform slope is less than the set slope Greater than: The oscilloscope triggers when the waveform slope is greater than the set slope
Overtime Trigger	The leading edge: Rising edge or Failing edge, Time setting: 20 to 10s
Alternative Trigger
Trigger on CH1	Internal Trigger: Edge, Pulse Width, Video, Slope
Trigger on CH2	Internal Trigger: Edge, Pulse Width, Video, Slope
Trigger Frequency Counter
Readout Resolution	6 digits
Accuracy (typical)	±30ppm (including all frequency reference errors and ±1 count errors)
Frequency Range	AC coupled, from 4Hz minimum to rated bandwidth
Signal Source	Pulse Width or Edge Trigger modes: all available trigger sources The Frequency Counter measures trigger source at all times, including when the oscilloscope acquisition pauses due to changes in the run status, or acquisition of a single shot event has completed. Pulse Width Trigger mode: The oscilloscope counts pulses of significant magnitude inside the 1s measurement window that qualify as trigger able events, such as narrow pulses in a PWM pulse train if set to < mode and the width is set to a relatively small time. Edge Trigger mode: The oscilloscope counts all edges of sufficient magnitude and correct polarity. Video Trigger mode: The Frequency Counter does not work.
Measurement
Cursor Measurement	Manual: Voltage difference between cursors: △V Time difference between cursors: △T Reciprocal of △T in Hertz (1/ΔT); Tracing: The voltage and time at a waveform point;
Auto Measurement	Frequency, Period, Mean, Peak-to-peak, Cycle RMS, PRMS, Minimum, Maximum, Rise Time, Fall Time, + Width, – Width, + Duty, – Duty, Base, Top, Middle, Amplitude, Overshoot, Pre-shoot, P mean, FOV Shoot, RPRE Shoot, B Width, Delay 1-2 ↑, Delay 1-2 ↓, LFF, LFR, LRF, LRR, FFR, EFRF

• Data Acquisition

There are two kinds of acquisition:

• Real Time Acquisition

1. Normal In this Acquisition mode, the oscilloscope samples the signal in evenly spaced intervals to establish the waveform.
2. Peak Detect In this Acquisition mode, the oscilloscope gets the maximum and minimum values of the input signal over each sample interval and uses these values to display the waveform.
3. Average In this acquisition, the oscilloscope acquires several waveforms, averages them, and displays the resulting waveform. In this mode one can reduce random noise.

• Equivalent Acquisition

This kind of acquisition can be utilized for periodic signals. In case the acquisition rate is too low when using the real-time acquisition

• Time Base

The oscilloscope digitizes waveforms by acquiring the value of an input signal at discrete points. The time base helps to control how often the values are digitized

Waveform Scaling and Positioning

The display of waveforms on the screen can be changed by adjusting their scale and position. Once the scale changes, the waveform display will increase or decrease in size. Once the position changes, the waveform will move up, down, right or left.

• Vertical Scale and Position: The vertical position of a waveform can be changed by moving it up and down on the screen.
• Horizontal Scale and Position: Pre trigger Information

You can adjust the Horizontal Position control to view waveform data before the trigger, after the trigger or some of each. When you change the horizontal position of a waveform, you are actually changing the time between the trigger position and the screen centre.

• Waveform Measurement

The oscilloscope displays graphs of voltage versus time and can help to measure the displayed waveform. There are several ways to take measurements.

• Graticule: This method allows to make a quick, visual estimate and take a simple measurement through the graticule divisions and the scale factor
• Cursor: This method allows taking the measurements by moving the cursors. Cursors always appear in pairs and displayed readouts are just their measured values.
• Automatic Measurement: The oscilloscope performs all the calculations automatically in this mode

Basic Operation

The front panel of the oscilloscope is divided into several functional areas:

1. LCD Display
2. F1 to F5; sets or switch options for the menu
3. Direction Keys
4. Hori: Shows Horizontal menu
5. Trig: Shows Trigger menu
6. Auto: Be used for auto setting under the oscilloscope operation mode
7. Run/stop: Key for running or stopping the operation
8. Time/Div: Decrease or increase the time base
9. Position: Adjust the horizontal trigger position
10. Save / Recall: Shows save or recall menu
11. MEAS: Shows Measurement menu
12. Menu: Turn on/off the menu
13. Level: Adjust the trigger level
14. Volts: Decrease or increase the voltage/div
15. M/R: Shows the Math or REF menu
16. DMM buttons: The DMM control buttons
17. DMM/ Scope: Switch DMM or scope function
18. CH2:Shows the CH2 menu
19. CH1: Shows the CH1 menu
20. Utility: Shows Utility menu
21. Cursor: Shows Cursor menu

Display Area

1. Display Format
2. Acquisition Mode: Normal, Peak Detect or Average
3. Trigger Status
4. Tool Icon
5. Main Time Base Window
6. Display of window’s position in data memory and data length
7. Window Time Base
8. Operating Menu shows different information for different function keys
9. Trig level
10. Trigger Type (Edge trigger on the rising edge, falling edge, Video trigger with line synchronization, Video trigger with field synchronization, pulse width trigger: positive polarity and negative polarity)
11. Level Range
12. Icon indicates whether the waveform is inverted or not
13. 20M Bandwidth limit, if this icon lights up, it means the bandwidth limit is enabled, otherwise disabled
14. Icon indicate channel coupling
15. Channel Marker
16. Window displays waveform

XY Format

The XY format is used to analyze phase differences, such as those represented by Lissajous patterns. The format plots the voltage on CH1 against the voltage on CH2, where CH1 is the horizontal axis and CH2 is the vertical axis.

Controls	Usable or not in XY format
CH 1 VOLTS And VERTICAL POSITION controls	Set the horizontal scale and position
CH2 VOLTS and VERTICAL POSITION controls	Continuously set the vertical scale and position
Reference or Math	Unusable
Cursors	Unusable
Autoset (display format reset to YT)	Unusable
Time base controls	Unusable
Trigger controls	Unusable

Horizontal Controls

Use the horizontal controls to change the horizontal scale and position of waveforms. The horizontal position readout shows the time represented by the center of the screen, using the trigger time as zero. When you change the horizontal scale, the waveform will expand or contract to the screen center.

• Horizontal Position Bar: Used to control the trigger position against the screen center
• Each Option in HORI Menu is as follows:

Options	Settings	Comments
Window Ctrl	Double Win Single Win	Set the current window mode to single or double window
Window set	Major win Minor win	Selects the major or minor window in dual-window mode. The window is highlighted once selected. Press this option button in single-window mode to enter the dual window mode
HoldOff		Select this menu and click the up and down arrow keys to adjust the trigger holdoff time within the range of 100 ns to 10 s
Reset		Recover the horizontal trigger position to the middle screen
Pre Mark		This function is usable only in dual window mode. It sets marks at some waveform record locations that users are interested in
Next Mark		This function is usable only in dual-window mode. It sets marks at some waveform record locations that users are interested in
Set/Clear		Set or Clear the current Mark
Play/Stop		This function is usable in dual-window mode. Push this menu button and auto move it from left to right at a specified speed

Single Window Mode

 

Dual Window Mode

Location of expanded window data in memory

 

Time/DIV: Used to change the horizontal time scale so as to magnify or compress the waveform horizontally.

Scan Mode Display (Roll Mode)

With the Time/div control set to 80 ms / div or slower and the trigger mode set to Auto, the oscilloscope works in the scan acquisition mode.

Vertical Controls

Vertical controls can be used to display and remove waveforms, adjust vertical scale and position, set input parameters and perform math calculation. Each channel has a separate vertical menu to set.

1. Vertical Position Bar: Move the channel waveform up and down on the screen. In dual-window mode, move the waveforms in both windows at the same time in a same direction. Two Channels correspond to two bars
2. Menu (CH1, CH2): Display vertical menu options; turn on or off the display of channel waveforms

Ground Coupling

Used to display a zero-volt waveform, internally, the channel input is connected with a zero-volt reference level

Fine Resolution

In the fine resolution setting, the vertical scale readout displays the actual VOLTS setting. The vertical scale changes only after you adjust the VOLTS control and set to coarse.

Remove Waveform Display

To remove a waveform from the screen, first push the menu button to display the vertical menu, and then push again to remove the waveform. A channel waveform which is unnecessary to be displayed can be used as a trigger source or for math operations.

Volts

Control the oscilloscope to magnify or alternate the source signal of the channel waveform. The vertical size of the display on the screen will change to ground level.

Math Menu

Display the waveform math operations. The Math menu contains source options for all math operations

Operations	Source Options	Comments
+	CH1+CH2	Add Channel 1 to Channel 2
–	CH1-CH2	Subtract the channel 2 waveforms from the channel 2 waveforms
X	CH1XCH2	Multiply CH1 with CH2
/	CH1/CH2	CH1 Divided by CH2
	CH2/CH1	CH2 Divided by CH1
Position		Set the math channel’s position
Scale		Set the Vertical Scale
FFT	Window	Five types of window, available for selection, Hanning, Flattop, Rectangular, Bartletta and Blackman
	Source	CH1   CH2
	FFT Zoom	Use the FFT Zoom button to adjust the window size, Scale: x1 , x2, x5, x10
	Vertical Base	dBms Vms

Math FFT

• Analyze harmonics in power cords
• Measure harmonic content and distortion in systems
• Characterize noise in DC power supplies
• Test impulse response to filters and systems
• Analyze vibration

To use the Math FFT mode, perform the following tasks:

• Set the source (time-domain) waveform
• Display the FFT spectrum
• Choose a type of FFT window
• Adjust the sample rate to display the fundamental frequency and harmonics without aliasing
• Use zoom controls to magnify the spectrum
• Use cursors to measure the spectrum

Setting Time-domain Waveform

It is necessary to set the time-domain (YT) waveform before using the FFT mode. Follow the steps below:

1. Push the Auto button to display YT waveform.
2. Click the Vertical Position key to vertically move the YT waveform to the center (zero division) so as to ensure the FFT will display a true DC value.
3. Click the Horizontal Position key to position the part of the YT waveform to be analyzed in the center eight divisions of the screen. The oscilloscope uses the 2048 center points of the time-domain waveform to calculate the FFT spectrum.
4. Click the VOLTS Key to ensure the entire waveform remains on the screen. If the entire waveform is invisible, the oscilloscope may display wrong FFT results by adding High-frequency components.
5. Click the TIME/DIV key to provide the resolution you need in the FFT spectrum.
6. If possible, set the oscilloscope to display multiple signal cycles.

If you click the TIME/DIV key to select a faster setting (fewer cycles), the FFT spectrum will display a larger frequency range and reduce the possibility of FFT aliasing.

To set the FFT display, follow the steps

1. Push the M/R button;

2. Set the Operation option to FFT;
3. Select the Math FFT Source channel.

In many situations, the oscilloscope can also generate a useful FFT spectrum despite the YT waveform not being triggered. This is especially true if the signal is periodic or random (such as noise).

Nyquist Frequency

The highest frequency that any real-time digital oscilloscope can measure without errors is half of the sample rate, which is called the Nyquist frequency. Frequency information beyond the Nyquist frequency is under sampled which brings about the FFT aliasing. The math function can convert the center 2048 points of the time-domain waveform to an FFT spectrum. The resulting FFT spectrum contains 1024 points from DC (0Hz) to the Nyquist frequency

Displaying FFT Spectrum

Push the MATH MENU button to display the Math menu. Use the options to select the Source channel, the Window algorithm and the FFT Zoom factor. Only one FFT spectrum can be displayed at a time.

Math FFT Options	Settings	Comments
Source	CH1, CH2	Choose a channel to be the FFT source
Window	Hanning, Flattop, Rectangular, Bartlett, Blackman	Select a type of the FFT window
FFT Zoom	X1, X2 , X5, X10	Change the horizontal magnification of the FTT display
Vertical Base	dBms,Vms	Set dBms to be the vertical base Set Vms to be the vertical base

Selecting FFT Window

Using windows can eliminate the special leakage in the FFT spectrum. The FFT algorithm assumes that the YT waveform repeats all the time. When the number of cycles is integral the YT waveform starts and ends at the same amplitude and there are no discontinuities in the signal shape

Applying a window to the YT waveform changes the waveform so that the start and stop values are close to each other, which reduces the discontinuities

The Math FFT function has three FFT Window options. There is a trade-off between frequency resolution and amplitude accuracy for each type of window. You shall determine which one to choose according to the object you want to measure and the source signal characteristics.

FFT Aliasing

Problems occur when the time-domain waveform acquired by the oscilloscope contains frequency components higher than the Nyquist frequency. The frequency components above the Nyquist frequency will be under sampled and displayed as lower frequency components that ‘fold back’ from the Nyquist frequency. These erroneous components are called aliases.

Eliminating Aliases

To eliminate aliases, use the following methods.

• Click the TIME/DIV key to set a faster sample rate. Because the Nyquist frequency increases as you increase the sample rate, the aliased frequency components will be displayed correct.
• If too many frequency components appear on the screen, you may use the FFT Zoom option to magnify the FFT spectrum.
• If there is no need to observe the frequency components above 20MHz, set the Bandwidth Limit option to Limited.
• Filter the signal input from outside and limit the bandwidth of the source waveform to lower than the Nyquist frequency.
• Identify and ignore the aliased frequencies.
• Use zoom controls and cursors to magnify and measure the FFT spectrum.

Magnifying and Positioning FFT Spectrum

You may scale the FFT spectrum and use cursors to measure it through the FFT Zoom option which enables the horizontal magnification. To vertically magnify the spectrum, use the vertical controls.

Horizontal Zoom and Position

You can use the FFT Zoom option to magnify the FFT spectrum horizontally without changing the sample rate. The available zoom factors are X1(default), X2, X5 and X10. When the zoom factor is set to X1 and the waveform is located at the center graticule, the left graticule line is at 0Hz and the right is at the Nyquist frequency.

Vertical Zoom and Position

When the FFT spectrum is being displayed, the channel vertical keys become the zoom and position controls corresponding to their respective channels. The VOLTS key provides the following zoom factors: X1(default), X2, X5 and X10. The FFT spectrum is magnified vertically to the marker M (math waveform reference point on the left edge of the screen). Click the Vertical Position key to move up the spectrum.

Using Cursors to Measure FFT Spectrum

You may use cursors to take two measurements on the FFT spectrum: amplitude (in dB) and frequency (in Hz). Amplitude is referenced to 0db that equals 1VRMS here. You may use cursors to measure at any zoom factor.

Push the CURSOR button, choose the Source option and then select Math. Press the Type option button to select between Amplitude and Frequency. Click the SELECT CURSOR option to choose a cursor. Then move Cursor S and Cursor E. Use the horizontal cursor to measure the amplitude and the vertical cursor to measure the frequency.

Trigger Controls

The trigger can be defined through the Trigger Menu. There are six types of trigger: Edge, Trigger When: Video, Pulse Width, Alter, Slope and Overtime. Refer to the following tables to find a different set of options for each type of trigger.

TRIG MENU

Push this button to display trigger menus. The edge trigger is in common use.

TRIG Level

It sets the amplitude level the signal must cross to cause an acquisition when using the Edge or Pulse Width trigger.

Video Trigger

Pulse Width Trigger

Trigger when: The pulse width of the source must be ≥ 5 ns so that the oscilloscope can detect the pulse

＝, ≠: Within a ±5% tolerance, triggers the oscilloscope when the signal pulse width is equal to or not equal to the specified pulse width.

＜, ＞: Triggers the oscilloscope when the source signal pulse width is less than or greater than the specified pulse width.

Slope Trigger: Judges trigger according to the time for rising or falling, more flexible and accurate

Alter Trigger: As a feature of analog oscilloscopes, it gives stable displays of signals at two different frequencies. Mainly it uses a specific frequency to switch between two analog channels CH1 and CH2 so that the channels will generate Alter trigger signals through the trigger circuitry.

Overtime Trigger: In Pulse Width trigger, you may sometimes be puzzled with the long time for trigger, as you do not need a complete pulse width to trigger the oscilloscope, but want the trigger occurs just upon the overtime point. This is called Overtime Trigger

Holdoff: To use Trigger Holdoff, push the HORI button and set the Holdoff Time option. The Trigger Holdoff function can be used to generate a stable display of complex waveforms (such as pulse trains). Holdoff is the time between when the oscilloscope detects one trigger and when it is ready to detect another. During the holdoff time, the oscilloscope will not trigger. For a pulse train, the holdoff time can be adjusted to let the oscilloscope trigger only on the first pulse in the train.

Menu and Option Buttons

• Save/ Recall:  Press Save /Recall button to save or recall oscilloscope setups or waveforms
• MEASURE:

Push the MEAS button to perform auto measurements. There are 32 types of measurements and up to 4 types can be displayed on the screen. User can turn directions keys to select measurement item, or push “Modify -> Type” to select the measurement type. Press “Modify” button to select the measure source (CH1 or CH2) and measure type. Then press “OK” button to change successfully.

Click the MEAS key then the following menu appears.

    

Taking Measurements: For a single waveform (or a waveform divided among multiple Waveforms), up to 4 automatic measurements can be displayed at a time. The waveform channel must stay in an ‘ON’ (displayed) state to facilitate the measurement. The automatic measurement cannot be performed on reference or math waveforms, or in XY or Scan mode.

• UTILITY
• Self-Cal: The self-calibration routine can optimize the precision of the oscilloscope to fit the ambient temperature. To maximize the precision, you should perform the self- calibration once the ambient temperature changes by 5 or more. Follow the instructions on the screen.
• DISPLAY

The waveform display is affected by settings of the oscilloscope. A waveform can be measured once it is captured. The different styles to display a waveform on the screen give significant information about it.

• There are two modes to display waveforms Single-window and Dual-window.

ACQUIRE

Press “UTILITY” key to enter the Utility menu and turn to the page and then Push the ACQUIRE key to set the acquisition parameter.

Normal: For the oscilloscope model with the bandwidth of 100MHz, the maximum sample rate is 1GS/s. For time base with insufficient sample rate, you may use the Sine Interpolation Algorithm to interpolate points between sampled points to produce a complete waveform record (4K by default).

Peak Detect: Use this mode to detect glitches within 10ns and to limit the possibility of aliasing. This mode is valid at the TIME/DIV setting of 4μs/div or slower. Once you set the TIME/DIV setting to 4μs/div or faster, the acquisition mode will change to Normal because the sample rate is fast enough that Peak Detect is unnecessary. The oscilloscope does not display a message to tell you that the mode has been changed to Normal.

Average: Use this mode to reduce random or uncorrelated noise in the signal to be displayed.

Acquire data in Normal mode and then average a great number of waveforms. Choose the number of acquisitions (4, 16, 64 or 128) to average for the waveform.

Stopping the Acquisition:  In the running situation of the acquisition, the waveform display’s is live. Stop the acquisition (press the RUN/STOP button) to freeze the display. In either mode, the waveform display can be scaled or positioned by vertical and horizontal controls.

Equivalent Acquisition: Just repeat the Normal acquisition. Use this mode to take a specific

observation on repeatedly displayed periodic signals. You can get a resolution of 40ps, i.e. 25GSa/s sample rate, which is much higher than that obtained in real-time acquisition

CURSOR

Moving Cursors: Press the key F3 to select a cursor and move it with the Arrow key. Cursors can be moved only when the Cursor Menu is displayed.

         

Time Cursor                                            Voltage Cursor

Display

The waveform display is affected by settings of the oscilloscope. A waveform can be measured once it is captured. The different styles to display a waveform on the screen give significant information about it.

There are two modes to display waveforms Single-window and Dual-window.

Fast Action Buttons

AUTO: Digital oscilloscope has the Auto-set advantage. When you push the Auto button, the oscilloscope will identify the type of waveform and adjust controls according to input signals so that it can accurately display the waveform of the input signal

RUN/STOP: Continuously acquire waveforms or stop the acquisition.

AUTOSET

Digital oscilloscopes have the advantage of Auto-set. When you push the AUTO button, the oscilloscope will identify the type of waveform (sine or square wave) and adjust controls according to input signals so that it can accurately display the waveform of the input signal.

The Auto-set function examines all channels for signals and displays corresponding waveforms.

Auto-set determines the trigger source according to the following conditions.

• If multiply channels get signals, the oscilloscope will use the channel with the lowest frequency signal as the trigger source.
• If no signals are found, the oscilloscope will use the lowest-numbered channel displayed in Auto-set as the trigger source.
• If no signals are found and no channels are displayed, the oscilloscope will display and use Channel 1 as the trigger source.

Sine Wave:

When you use the Auto-set function and the oscilloscope determines that the signal is similar to a sine wave

Square Wave or Pulse:

When you use the Auto-set function and the oscilloscope determines that the signal is similar to a square wave or pulse

Signal Connectors

See the figure below to find the two signals connectors and a pair of metal electrodes at the bottom of the oscilloscope panel

CH1, CH2: Input connectors for waveform display, through which to connect and input the signal to be measured.

1. Probe COMP: Voltage probe compensation output and ground, used to electrically match the probe to the oscilloscope input circuit. The probe compensation ground and BNC shields connect to earth ground and are considered to be ground terminals. To avoid damages, do not connect a voltage source to any of these ground terminals.

Multimeter

• Connecting the Meter

Use the 4-mm safety banana jack inputs for the Meter functions: 10 A, mA, COM,V/Ω/C

Multimeter Operation Window

• Operating the Multimeter

If you are in the oscilloscope window, presses SCOPE/DMM key, the oscilloscope will switch to the multimeter mode window. Then the screen will display the measure mode window that was in use the last time before you quit multimeter measure. When you switch to the multimeter measurement the first time, the default measure mode is DC voltage mode.

• Measuring Resistance Values

To measure a resistance, do the following:

1) Press the R key and then resistance measurement window appears on the screen.

2) Insert the black lead into the COM banana jack input and the red lead into the V/O/C banana jack input.

3) Connect the red and black test leads to the resistor. The resistance value is shown on the screen in ohm

• Making a Diode Measurement

To make a measurement on the diode, do the following:

1) Press the DIODE key and a diode symbol appears at the top of the screen.

2) Insert the black lead into the COM banana jack input and the red lead into the V/O/C banana jack input.

3) Connect the red and black leads to the diode and the voltage value of the diode is displayed on the screen in volt

Making an On-off Measurement

To perform an On-off test, do the following:

1) Press the On/Off key to select On-off indictor appears on the top of the screen.

2) Insert the black lead into the COM banana jack input and the red lead into the V/O/C banana jack input.

3) connect the red and black leads to the tested points. If the resistance value of the tested points is less than 30 Ω, you will hear beep sound from the test tool.

Making a Capacitance Measurement

To measure a capacitance, do the following:

1.  Press the C key and a capacitor symbol appears on the top of the screen.
2. Insert the black lead into the COM banana jack input and the red lead into the V/O/C banana jack input.
3. Connect the red and black leads to the capacitor and the capacitance value is displayed on the screen in μF or nF.

Making a DC Voltage Measurement

To measure a DC voltage, do the following:

1. Press the V key to select VOLT and DC appears at the top of the screen.
2.  Insert the black lead into the COM banana jack input and the red lead into the V/O/C banana jack input.
3. Connect the red and black leads to the measured points and the voltage value of measured points is displayed on the screen.

Making an AC Voltage Measurement

To measure the AC voltage, do the following:

1) Press the V key to select VOLT and DC appears on the screen.

2) Press the F1 key and AC appears on the screen.

3) Insert the black lead into the COM banana jack input and the red lead into the V/O/C banana jack input.

4) Connect the red and black leads to the measured points and the AC voltage value of measured points will be displayed on the screen.

Making a DC Current Measurement

To measure a DC current which is less than 600 mA, do the following:

1) Press the A key and then DC appears on the screen. The unit on the main reading screen is mA. Press F3 to switch the measurement between mA and 10A. 600mA is acquiescently.

2) Insert the black lead into the COM banana jack input and the red lead into the mA banana jack input.

3) Connect the red and black leads to the measured points and the DC current value of measured points will be displayed on the screen

To measure a DC current which is larger than 600 mA, do the following:

1) Press the F1 key to select A and then DC appears on the screen. The unit on the main reading screen is mA.

2) Press F3 key to switch to 10A measurement, the unit on the main reading screen is A.

3) Insert the black lead into the COM banana jack input and the red lead into the 10A banana jack input.

4) Connect the red and black leads to the measured points and the DC current value of the measured points will be displayed on the screen.

5) Press F2 to return to 600 mA measurement.

Making an AC Current Measurement

To measure an AC current which is less than 600 mA, do the following:

1) Press the F1 key to select A and then DC appears on the screen. The unit on the main reading screen is mA, and mA will display on the bottom of the screen, press F2 to switch the measurement between mA and 10A. 600mA is acquiescently.

2) Press the F1 key once and AC will display on the bottom of the screen.

3) Insert the black lead into the COM banana jack input and the red lead into the mA banana jack input.

4) Connect the red and black leads to the measured points and the AC current value of measured points will be displayed on the screen.

Taking a Relative Measurement

A currently measured result relative to the defined reference value is displayed in a relative

Measurement

1) Press the Ok.

2) Insert the black lead into the COM banana jack input and the red lead into the V/O/C banana jack input.

3) Connect the red and black test leads to the resistor. The resistance value is shown on the screen in Ohm.

4) When the reading leveling off, press F1 key and then ||/△is displayed on the top of the screen.

Selecting Automatic/Manual Range Adjustment

The default range mode of the instrument is automatic range. Suppose you are using the DC voltage mode, to switch to the manual range, perform the following steps:

1) Press F3 key to enter the manual range mode and then Manual is displayed on the top of the screen.

2) Under the manual range mode, the measuring range is increased by a stage when pressing F4 key each time, and when reaching the highest stage, it jumps to the lowest stage by pressing F4 key once again.

3) Press F3 key to switch back to the automatic range mode and then Auto is displayed on the top of the screen.

Troubleshooting

• Problem Settlement

1. If the oscilloscope does not start up at power on, follow these steps:

• Check the power cord to verify it has been connected properly;
• Check the power on/off button to ensure it has been pushed;
• Restart the oscilloscope.

2. If there is no display of waveforms on the screen when the oscilloscope is turned on, follow these steps:

1） Check the probe to assure its proper connection to the input BNC;

2） Check the channel switch (such as CH1, CH2 menu buttons) to make sure it has been turned on;

3） Check the input signal to verify it has been connected to the probe correctly;

4） Affirm that all measured circuits have signals to output;

5） Turn up the magnitude for DC signals with large magnitude;

6） In addition, you may press the Auto Measure button to perform an automatic detection of signals at first.

Contact our Technical Support department in time if there is still no display of waveforms.

3. If the waveform of the input signal is distorted seriously, follow these steps:

1） Check the probe to assure its proper connection to the channel BNC;

2） Check the probe to assure its good connection to the measured object;

3） Check the probe to verify it has been well calibrated. Otherwise, refer to the content about calibration described in this manual.

4. If the waveform is rolling continuously on the screen but cannot be triggered, follow these steps:

1） Check the trigger source to make sure it consistent with the input channel;

2） Check the trigger level to assure its correct adjustment.

3） Check the trigger mode to confirm it is a right choice for the input signal. The default trigger mode is edge trigger. However, it is not suitable for all kinds of input signals.