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3.6 Example 6: Triggering on Pulse Width
Triggering on a Specific Pulse Width
While testing the pulse width of a signal in a circuit, you may need to verify the pulse width is
consistent with the theoretic value. Or even if the edge triggering shows that your signal has the
same pulse width with the specific signal, you still doubt about the result. Then you can follow the
steps below.
1.
Set the Probe option attenuation to 10X.
2.
Push the AUTOSET button to trigger a stable waveform display.
3.
Push the Single Cycle option button in the Autoset menu and read out the signal pulse width.
4.
Push the TRIG MENU button.
5.
Push F1 to select Pulse for the Type option; push F2 to select CH1 for the Source option; turn
the TRIGGER LEVEL knob to set the trigger level at the bottom of the signal.
Push F6 to enter the next page. Select the When option button and Push F4 to select '='.
6.
7.
Push the Set Pulse Width option button. Turn V0 to set the pulse width to the value read out in
Step 3.
8.
Turn the TRIGGER LEVEL knob to set the pulse width to the value read out in Step 3.
9.
Push the More option button and select Normal for the Mode option. Once triggering on
normal pulses, the oscilloscope can give a stable waveform display.
10. If the When option is set to >, < or ≠ and there appear any aberrant pulses that meet the
specified condition, the oscilloscope will trigger. For example, the signal contains such
aberrant pulses as shown below, you may select '≠' or '<' to trigger on the pulse.
As shown in the above figure, you can get a stable waveform display if inputting a square wave at
the frequency of 1KHz, with pulse width set to 500μs.
QC1936 Digital Storage Oscilloscope
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