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> (greater than a time value): trigger when the positive or negative pulse time of the input signal is
greater than the specified time value.
!= (not equal to a time value): trigger when the positive or negative pulse time of the input signal is not
equal to the specified limit of time.
= (equal to a time value): trigger when the positive or negative pulse time of the input signal is equal to
the specified limit of time.
6. Press the Time softkey and turn V0 to set the reference value of the time.
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 complex waveforms are displayed stably.
2.7.9. Under Amp Trigger
The Under Amp trigger looks for pulses that cross one threshold but not another as shown in the
picture below.
⚫ A positive under Amp pulse across through a lower threshold but not an upper threshold.
⚫ A negative under Amp pulse across through an upper threshold but not a lower threshold.
To trigger on under Amp pulse:
1. Press the [Trig Menu] button on the front panel to enter the Trigger system function menu.
2. Press the Type softkey, then turn the Multifunctional Knob to select Under Amp and push down the
knob to confirm.
3. Press the Source softkey, turn the Multifunctional Knob to select CH1~CH2 as the trigger source.
4. Press the Polarity softkey to select Positive or Negative pulse to trigger.
5. Press the When softkey, turn the Multifunctional Knob to select the desired condition (<, >, != or =).
6. Press the Width softkey, and then turn the Multifunctional Knob to select the desired value.
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