Chapter 2 Operating Your Frequency Counter
Using CHANNEL 1 Input Conditioning Keys
2-44 Operating Guide
2
The sensitivity specification is given in terms of volts rms for applications that
involve measuring a sine wave signal, though it should be noted that a different
waveform with the same rms voltage may not trigger a count.
Since the Counter input does not respond to the rms value of the waveform but only to
the peak-to-peak value, the sensitivity specification is also given for volts peak-to-
peak with a minimum pulse width.
As previously mentioned, the sensitivity of the Counter can be changed by using the
SENSTVTY: MED, HI, or LOW menu choices in the Trigger/Sensitivity key
menu for optimum sensitivity for certain measurement applications. For example, low
sensitivity setting is very useful when measuring noisy signals.
To Use the Trigger/Sensitivity Key to Adjust Counter’s Trigger
Voltage and Sensitivity Levels
1Turn POWER key OFF then ON again (cycle POWER key) to preset the Counter.
2 Connect a signal to CHANNEL 1 input, and press Freq Ch 1 key to measure the
frequency of the signal.
3 Press CHANNEL 1 Trigger/Sensitivity key.
AUTO TRG: ON is displayed.
Note that the Trigger/Sensitivity LED indicator is on, corresponding to AUTO TRG:
ON.
4 Press any one of the arrow keys to toggle to the auto trigger off mode.
AUTO TRG: OFF is displayed.
Note that the Trigger/Sensitivity LED indicator is off, corresponding to AUTO TRG:
OFF.
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