292 Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide
17 Digital Voltmeter and Counter
2 Press Features; then, select Counter.
3 Press Features again to enable the counter.
4 Press the Source softkey and turn the Entry knob to 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 TRIG 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.
5 Press Auto Setup Threshold softkey to have the oscilloscope automatically
determine and set the threshold voltage (trigger) level for the selected analog
channel source.
6 Press the Measure softkey and turn the Entry knob to select what the counter
measures:
• Frequency — the cycles per second (Hz, kHz, or MHz) of the signal.
• Period — the time periods of the signal's cycles.
• Totalize — the count of edge events on the signal.
Frequency and
Period Counter
For frequency and period measurements, press the # of Digits softkey to specify the
resolution of the counter. You can choose from 3 to 8 digit resolutions.
Higher resolutions require longer gate times, which cause the measurement times
to be longer as well.
Totalize Counter For (edge event) totalize measurements, press the Clear Count softkey to zero the
edge event counter.
Press the Totalize softkey to open the Counter Totalize Menu where you can:
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