238 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
17 Digital Voltmeter and Counters
5 From the Source drop-down list, select the analog channel or Trigger Qualified
Event signal to make counter measurements on.
With the Trigger Qualified Event source (available when the trigger mode is not
Edge), you can see how often trigger events are detected. This can be more
often than when triggers actually occur, due to the oscilloscope's acquisition
time or update rate capabilities. The AUX OUT signal shows when triggers
actually occur. Remember that the oscilloscope's trigger circuitry does not
re-arm until the holdoff time occurs and that the minimum holdoff time is 40 ns;
therefore, the maximum trigger qualified event frequency that can be counted
is 25 MHz.
The selected channel does not have to be on (displaying a waveform) in order
for counter measurements to be made.
6 Select the Threshold field, and enter the threshold voltage (trigger) level for the
selected analog channel source.
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