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be used to generate a stable display of complex waveform (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.

Trigger Level

Indicates Trigger Points

Holdoff

Acquisition Interval

2.7.1. Edge Trigger

Edge trigger distinguishes the trigger points by seeking the specified edge (rising, falling, rising & falling) and trigger level.

1. Press the [Trig Menu] button on the front panel to enter the Trigger system function menu.

2. Press the Type softkey, turn the Multifunctional Knob to set select “Edge” and then press the knob to confirm.

3. Press the Source softkey, turn the Multifunctional Knob to select CH1~CH2 or External or Line as the trigger source.

CH1~CH2: Analog channel.

External: External trigger input, it is on the front panel of the oscilloscope. The external trigger signal must be a 0-3.3V

[CMOS] waveform.

Line: Trigger on the 50% level of the AC power signal.

4. Press the Slope softkey, turn the Multifunctional Knob to select the desired trigger edge (rising, falling or rising & falling),

and then press down the knob to confirm.

5. Turn the Trigger Level Knob to adjust the trigger level to obtain stable trigger.

6. Press of 50% softkey to set the trigger level to the vertical midpoint between the peaks of the trigger signal. The trigger

level values are displayed at the upper right corner of the screen.

7. Press the Mode softkey, turn V0 to select the trigger mode (auto, normal), and press V0 to confirm.

Auto: When the oscilloscope meets the trigger condition, it completes a trigger acquisition once; when the trigger condition

is not met, it can run the acquisition waveform freely.

Normal: When the oscilloscope meets the trigger condition, the input waveform is displayed; when the trigger condition is

not met, the original waveform is displayed.

8. Press the Holdoff softkey and turn V0 to set the time that the oscilloscope waits before a trigger to the next trigger, so that

DigiTech QC1938 User Manual

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