V0
Multi-function knob. Under different menu options, it supports selecting menu options (MEASURE), moving cursors and levels (Slope Trigger).
Press this knob to reset data (trigger holdoff, overtime of the overtime trigger and slope trigger), select menu options and so on.
Author: WisdomAugust Time: 2016-8-11 08:39
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F7
Switch the display between single-window mode and dual-window mode.
F0
To hide or show the menu options on the right side of the screen.
F6
Press this key to turn pages.
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2.2.2 Softkeys
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F1-F5
The functions of these keys change based upon the menus shown on the display directly above the keys.
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2.1.4 Fast Action Keys[attach]1087[/attach]
AUTOSET
When you press this key, the oscilloscope will automatically adjust the vertical scale, horizontal time base and trigger mode according to the input signal to realize optimum waveform display.
SINGLE SEQ
Press this key to set the trigger mode to “Single”. Acquire a single waveform and then stop the acquisition.
RUN/STOP
To set the state of the oscilloscope to “RUN” or “STOP”. In “RUN” state, the oscilloscope acquire waveform continuously. In “STOP” state, the oscilloscope stop waveform acquisition.
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HELP
Display the help menu. The help system of this oscilloscope provides instructions for all the function keys at the front panel.
DEFAULT SETUP
Recall the factory setup. The following settings do not change when you push the DEFAULT SETUP key.
? Language Option
? Saved Settings
? Saved Reference Waveforms
? Display Contrast
? Calibration Data
SAVE TO USB
Save all displays on the screen to a USB memory stick.
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PROBE CHECK
To configure the probe option attenuation factor properly.
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2.3 Connectors[attach]1116[/attach]
Channel Input BNC Connector (CH1, CH2)
This is the channel’s input connector. Attach the oscilloscope probe or BNC cable to the BNC connector.
EXT TRIG
It’s a external trigger input, which can be used as a source in several of the trigger types.
Probe Compensation Terminals
Use the signal at these terminals (probe compensation terminal and ground terminal) to match each probe’s characteristics to the oscilloscope channel to which it is connected.
Author: WisdomAugust Time: 2016-9-3 13:38
Section 3 Using the Vertical System
3.1 To turn waveforms on or off (channel or math)
Pressing the channel (CH1 MENU, CH2 MENU), and MATH MENU front panel keys 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 is displayed.
Author: WisdomAugust Time: 2016-9-5 11:28
3.2 To adjust the vertical scale
When an input channel waveform is on:
? Turn its vertical scale knob (VOLTS/DIV) to change the amplitude per division setting.
? The amplitude/div setting changes in a 1- 2- 5 step sequence from 2 mV/div to 5 V/div (with “1X” probe attenuation).
? The amplitude/div setting is displayed in the status bar at the bottom of the screen.
NOTE Either ground or the center of the screen is used as a reference. The “center of screen” reference is not available for math function.
Author: WisdomAugust Time: 2016-9-6 09:19
3.3 To adjust the vertical position
Adjusting their vertical position lets you compare waveforms by aligning them above one another or on top of each other.
When an input channel waveform is on:
? Turn the vertical position knob (POSITION) to change the vertical position of the waveform on the screen.
? Push the vertical position knob to “zero” the ground reference (in other words, move it to the center of the screen).
NOTE
? The ground reference symbol on the left side of the display moves with the waveform.
? Notice that, as you adjust the vertical position, a message showing the position of the ground reference relative to the center of the screen is temporarily displayed at the bottom corner of the screen.
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3.6 To change the Volts/Div control sensitivity
When you need to adjust the amplitude/div setting in smaller increments, you can change the sensitivity of the vertical scale control.
?If the channel’s menu is not currently displayed, press the channel key (CH1 MENU, or CH2 MENU).
?In the Channel menu, press Volts/Div to toggle between:
?Coarse The vertical scale knob changes the amplitude/div setting in a 1- 2- 5 step sequence from 2 mV/div to 10 V/div (with “1X” probe attenuation).
?Fine Also known as vernier, the vertical scale knob changes the amplitude/div setting in small steps between the normal (coarse scale) settings.
Author: WisdomAugust Time: 2016-9-20 08:48
3.7 To specify the probe attenuation
For correct measurements, you must match the oscilloscope’s probe attenuation factor settings with the attenuation factors of the probes being used.
The probe attenuation factor setting changes the vertical scaling of the oscilloscope so that the measurement results reflect the actual voltage levels at the probe tip.
? If the channel’s menu is not currently displayed, press the channel key ( CH1 MENU, or CH2 MENU).
? In the Channel menu, press Probe.
? Continue pressing the Probe softkey to select between:
l 1X For 1:1 probes.
l 10X For 10:1 probes.
l 100X For 100:1 probes.
l 1000X For 1000:1 probes
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3.9 Using Math Function Waveforms
3.9.1 The math functions control allows the selection of the math functions:
? Add.
? Subtract.
? Multiply.
? Divide.
? FFT (Fast Fourier Transform).
The mathematical result can be measured using the grid and cursor controls.
The amplitude of the math waveform can be adjusted using a menu item selection in the Math menu.
The math scale setting is shown at the bottom of the Math menu.
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Author: WisdomAugust Time: 2016-10-10 09:35
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3.9.2 To add, subtract, multiply, or divide waveforms
1. Press MATH MENU.
2. In the Math menu, press Operation.
3. Continue pressing the Operation softkey to select “CH1+ CH2”, “CH1- CH2”, “CH2-CH1”, “CH1 x CH2”, “CH1/CH2”, or “CH2/CH1”.
4. Press Position softkey and turn multifuction knob to adjust the position of the math waveform.
5. Press Scale, and turn multifuction knob to adjust the math scale.
Author: WisdomAugust Time: 2016-10-19 08:46
3.9.3 To display the frequency domain using FFT
The FFT math function mathematically converts a time- domain waveform
into its frequency components. FFT waveforms are useful for finding the
harmonic content and distortion in systems, for characterizing noise in DC
power supplies, for analyzing vibration, for estimating the impulse responses in systems, and for measuring the harmonic in power cords.
To display a waveform’s FFT:
1.Press MATH MENU.
2.In the Math menu, press Operation.
3.To select “FFT”.
4. Press Sourcesoftkey to select the desired input channel.
NOTE
? The FFT of a waveform that has a DC component or offset can cause incorrect FFT waveform magnitude values. To minimize the DC component, choose AC Coupling on the source waveform.
? To reduce random noise and aliasing components (in repetitive or single-shot waveforms), set the oscilloscope acquisition mode to averaging.
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If the number of cycles is non-integral, the YT waveform starts and ends at different amplitudes and transitions between the start and end points will cause discontinuities in the signal that introduces high-frequency transients.
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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.
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7. Turn the vertical position knob of the selected source channel to adjust the vertical position of the FFT waveform.
8. Turn the vertical VOLTS/DIV knob of the selected source channel to adjust the vertical scale of the FFT waveform.
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Nyquist Frequency and Aliasing in the Frequency Domain
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. The Nyquist frequency is also called the folding frequency because aliased frequency components fold back from that frequency when viewing the frequency domain.
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Section 4 Using the Horizontal Controls
The horizontal controls consist of: the horizontal scale (SEC/DIV) knob, the horizontal position (POSITION) knob, and the (HORIZ MENU) key.
4.1 To adjust the horizontal scale
4.1.1 Turn the horizontal scale knob to change the horizontal time per division (sec/div) setting.
The sec/div setting changes in a 2- 4- 8 step sequence.
The sec/div setting is also known as the sweep speed.
When the sec/div is set to 80 ms/div or slower, the oscilloscope enters Slow Scan mode.
When the horizontal scale is set to 800 ns or faster, the oscilloscope uses sine(x)/x interpolation to expand the horizontal time base.
The sec/div setting is displayed in the status bar at the top left of the screen. Because all channels are displayed in the same time base (except in the Alternate trigger mode), the oscilloscope displays one sec/div setting for all channels.
Author: WisdomAugust Time: 2016-11-4 14:35
4.1.2 Slow Scan Mode
When the horizontal scale is set to 80 ms/div or slower, the oscilloscope enters Slow Scan mode.
In the Slow Scan mode, peak detect acquisition is used so that no data is missed (even the though the Acquire menu may show a different acquisition mode setting). The oscilloscope acquires sufficient data for the pre- trigger part of the display, then waits for the trigger. When the trigger occurs, the oscilloscope continues to capture data for the post- trigger part of the display.
When using the Slow Scan mode to view low frequency signals, the channel coupling should be set to “DC”.
The Slow Scan mode lets you see dynamic changes (like the adjustment of a potentiometer) on low frequency waveforms. For example, Slow Scan mode is often used in applications like transducer monitoring and power supply testing.
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4.4 To set marks
Mark at some waveform record locations that users are interested in, and searches for these marks by right and left arrows. Then it positions the window to this mark for further observation.
? If the it a full screen display (single-window), press F7 to display dual-windown.
? Turn the horizontal POSITION knob to locate the portions of the waveform.
? Press Set/Clear softkey to set marks.
? Press right arrow or left arrow softkeys to search these marks to view the marked locations waveforms.
? Press Clear All and Set/Clear softkeys to remove the marks.
NOTE The mark function only valid in dual-window mode.
Author: WisdomAugust Time: 2016-11-11 08:31
4.5 To adjust the trigger holdoff
? Press HORIZ MENU.
? Press F6 turn to page 2/2.
? Press Holdoff softkey.
? Turn the multi-functional knob to adjust the trigger holdoff time within the range of 100ns-10s.
? Push the multi-functional knob to reset the holdoff time with the starting value 100ns.
Author: WisdomAugust Time: 2016-11-14 08:45
4.6 Auto display
Push the Play/Stop softkey to move the waveforms automatically from left to right at a specified speed. In the expanded window will display corresponding waveforms until it stops once reaching the rightmost side of the major scan window.
NOTE The mark function only valid in dual-window mode.
Author: WisdomAugust Time: 2016-11-15 08:52
Section 5 Using the Trigger Controls
An oscilloscope’s trigger function is important to achieve clear signal characterization, as it synchronizes the horizontal sweep of the oscilloscope to the proper point of the signal. The trigger controls let you stabilize repeating waveforms and capture single-shot waveforms. By repeatedly displaying similar portion of the input signal, the trigger makes repeating waveforms appear static on the oscilloscope display.
Author: WisdomAugust Time: 2016-11-16 15:18
5.1 Adjusting the Trigger Level
The level control determines where on the edge the trigger point occurs.
5.1.1 To adjust the trigger level
? Turn the trigger LEVEL knob.
Two things happen:
l The trigger level value is displayed at the bottom center of the screen.
l A line is displayed showing the location of the trigger level with respect to the waveform (except when using AC coupling or LF reject coupling modes).
? Push the trigger LEVEL knob to set the level at 50% of the signal’s vertical amplitude.
Author: WisdomAugust Time: 2016-11-17 08:31
5.1.2 To force a trigger
To make an acquisition even if no valid trigger has been found:
? Press FORCE TRIG key.
Forcing a trigger is useful, for example, when you want to display the DC voltage of a level signal.
The FORCE TRIG key has no effect if the acquisition is already stopped.
Author: WisdomAugust Time: 2016-11-18 10:20
5.2 Choosing the Trigger Types
The trigger determines when captured data should be stored and displayed.
When a trigger is set up properly, it can convert unstable displays or blank screens into eaningful waveforms.
When the oscilloscope starts to acquire a waveform, it collects enough data so that it can draw the waveform to the left of the trigger point. The oscilloscope continues to acquire data while waiting for the trigger condition to occur. After it detects a trigger, the oscilloscope continues to
acquire enough data so that it can draw the waveform to the right of the trigger point.
The oscilloscope provides these trigger types:
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6. Press Mode and continue pressing the softkey to select the sweep to trigger on:
? Auto Cause the oscilloscope to sweep, even without a trigger. If no signal is present, a timer in the oscilloscope triggers the sweep. This ensures that the display will not disappear if the signal drops to small voltages. It is also the best mode to use if you are looking at many signals and do not want to bother setting the trigger each time.
? Normal The oscilloscope only sweeps if the input signal reaches the set trigger point; otherwise the screen is frozen on the last acquired waveform. Normal mode can be disorienting since you may not see the signal at first if the level control is not adjusted correctly.
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7. Press Coupling and continue pressing the softkey to select the components of the trigger signal applied to the trigger circuitry:
?AC Blocks DC components and attenuates signals below 10Hz.
?DC Passes all components of the signal.
?Noise Reject Eliminating noise from the trigger signal to prevent false triggering.
?HF Reject Attenuates the high-frequency components above 80kHz.
?LF Reject Blocks DC components and attenuates the low-frequency components below 8kHz.
NOTE Trigger coupling only affects the signal passed through the trigger system. It does not affect the bandwidth or coupling of the signal displayed on the screen.
Author: WisdomAugust Time: 2016-12-6 09:06
5.2.2 To set up video triggers
Video triggering is used to trigger on fields or lines of NTSC, PAL, or SECAM standard video waveforms.
When the video trigger mode is selected, the trigger coupling is set to AC.
1. Press TRIG MENU.
2. In the Trigger menu, press Type.
3. Continue pressing the Type softkey to select “Video”.
4. Press Source and continue pressing the softkey to select the waveform to trigger on:
? CH1 - CH2 The oscilloscope input channel.
? EXT The external trigger input.
? EXT/5 The (5:1) attenuated external trigger input.
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5. Press Polarity to toggle between:
?Normal trigger on the negative edge of the sync pulse.
?Inverted trigger on the positive edge of the sync pulse.
NOTE Normal Polarity Sync triggers always occur on negative-going horizontal sync pulses. If the video waveform has positive-going horizontal sync pulses, use the Inverted Polarity selection.
6. Press Standard to toggle between:
? NTSC Trigger on an NTSC video waveform.
? PAL/SECAM Trigger on a PAL or SECAM video waveform.
Author: WisdomAugust Time: 2016-12-8 09:09
7. Press Sync and continue pressing the softkey to select what to trigger on:
? All Lines Trigger on all lines.
? Line Num Trigger on a selected line.
If you select “Line Num”, turn the V0 knob to select the line number.
? Odd Field Trigger on an odd field.
? Even Field Trigger on an even field.
? All Fields Trigger on all fields.
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5.2.3 To set up pulse width triggers
A pulse width trigger occurs when a pulse that matches the pulse definition is found in a waveform.
1. Press TRIG MENU.
2. In the Trigger menu, press Type.
3. Continue pressing the Type softkey to select “Pulse”.
4. Press Source and continue pressing the softkey to select the waveform to trigger on:
? CH1 - CH2 The oscilloscope input channel.
? EXT The external trigger input.
? EXT/5 The (5:1) attenuated external trigger input.
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6. Press Mode and continue pressing the softkey to select the sweep to trigger on:
? Auto Cause the oscilloscope to sweep, even without a trigger.
? Normal The oscilloscope only sweeps if the input signal reaches the set trigger point; otherwise the screen is frozen on the last acquired waveform.
7. Press Coupling and continue pressing the softkey to select the components of the trigger signal applied to the trigger circuitry:
? AC Blocks DC components and attenuates signals below 10Hz.
? DC Passes all components of the signal.
? Noise Reject Eliminating noise from the trigger signal to prevent false triggering.
? HF Reject Attenuates the high-frequency components above 80kHz.
? LF Reject Blocks DC components and attenuates the low-frequency components below 8kHz.
8. Press When and continue pressing the softkey to select the type of pulse to trigger on:
? ＝ Pulse is equal to the width setting ±5%.
? ≠ Pulse is not equal to the width setting ±5%.
? > Pulse is greater than the width setting.
? < Pulse is leass than the width setting.
NOTE The pulse width of the source must be ≥5ns so that the oscilloscope can detect the pulse.
9. Press Pulse Width and turn the multi-functional knob to adjust the width setting from 20 ns to 10 s.
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5.2.4 To set up slope triggers
1. Press TRIG MENU.
2. In the Trigger menu, press Type.
3. Continue pressing the Type softkey to select “Slope”.
4. Press Source and continue pressing the softkey to select the waveform to trigger on:
? CH1 - CH2 The oscilloscope input channel.
? EXT The external trigger input.
? EXT/5 The (5:1) attenuated external trigger input.
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6. Press Mode and continue pressing the softkey to select the sweep to trigger on:
? Auto Cause the oscilloscope to sweep, even without a trigger.
? Normal The oscilloscope only sweeps if the input signal reaches the set trigger point; otherwise the screen is frozen on the last acquired waveform.
7. Press Coupling and continue pressing the softkey to select the components of the trigger signal applied to the trigger circuitry:
? AC Blocks DC components and attenuates signals below 10Hz.
? DC Passes all components of the signal.
? Noise Reject Eliminating noise from the trigger signal to prevent false triggering.
? HF Reject Attenuates the high-frequency components above 80kHz.
? LF Reject Blocks DC components and attenuates the low-frequency components below 8kHz.
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8. Press Vertical to select the desired vertical window:
? V1 Adjust the trigger level 1.
? V2 Adjust the trigger level 2.
Use Multifunction Knob to adjust the trigger level. During the adjustment, two green trigger level lines and two trigger marks appear on the screen and move up and down with the rotation of the knob, while at the same time, the trigger level value is displayed at the lower left corner of the screen. When stopping turning the knob, the trigger level lines disappear in about 2 s.
9. Press When and continue pressing the softkey to select the type of slope time to trigger on:
? ＝ Slope time of the input signal is equal to the specified time.
? ≠ Slope time of the input signal is not equal to the specified time.
? > Slope time of the input signal is greater than the specified time.
? < Slope time of the input signal is less than the specified time.
10. Press Time and turn the Multifunction Knob to adjust the slope time to trigger on. The range available is from 20 ns to 10 s.
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6. Press Mode and continue pressing the softkey to select the sweep to trigger on:
? Auto Cause the oscilloscope to sweep, even without a trigger.
? Normal The oscilloscope only sweeps if the input signal reaches the set trigger point; otherwise the screen is frozen on the last acquired waveform.
7. Press Overtime and turn the Multifunction Knob to adjust the overtime to trigger on. The range available is from 20 ns to 10 s.
8. Press Coupling and continue pressing the softkey to select the components of the trigger signal applied to the trigger circuitry:
? AC Blocks DC components and attenuates signals below 10Hz.
? DC Passes all components of the signal.
? Noise Reject Eliminating noise from the trigger signal to prevent false triggering.
? HF Reject Attenuates the high-frequency components above 80kHz.
? LF Reject Blocks DC components and attenuates the low-frequency components below 8kHz.
Author: WisdomAugust Time: 2017-1-3 16:46
7. Press Overtime and turn the Multifunction Knob to adjust the overtime to trigger on. The range available is from 20 ns to 10 s.
8. Press Coupling and continue pressing the softkey to select the components of the trigger signal applied to the trigger circuitry:
? AC Blocks DC components and attenuates signals below 10Hz.
? DC Passes all components of the signal.
? Noise Reject Eliminating noise from the trigger signal to prevent false triggering.
? HF Reject Attenuates the high-frequency components above 80kHz.
? LF Reject Blocks DC components and attenuates the low-frequency components below 8kHz.
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5.2.6 To set up alternate triggers
The Alternate trigger mode splits the display horizontally and lets you trigger on two, non- synchronized signals.
1. Press TRIG MENU.
2. In the Trigger menu, press Type.
3. Continue pressing the Type softkey to select “Alternate”.
4. Press Select to select the channel to set up triggering on, either “CH1” or “CH2”.
At this point, the remaining items in the Trigger menu let you set up independent triggers for the selected channel.
For each source, you can set up edge, video, pulse width, or overtime triggering.
You can also specify other trigger setup options, except trigger sweep.
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5.2.7 To specify a trigger holdoff
Trigger holdoff can be used to stabilize a waveform. The holdoff time is the oscilloscope's waiting period before starting a new trigger. The oscilloscope will not trigger until the holdoff time has expired.
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5.2.8 Using the External Trigger Input
You can trigger on external inputs by selecting “EXT” or “EXT/5” (5:1 attenuated) as the trigger source in all trigger modes except Overtime and Alternate.
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