Frequency and Period
This section describes how to configure frequency and period measurements from the front panel.
Step 1: Configure the test leads as shown.
Step 2: Press [Freq] on the front panel and then use the first softkey to choose either frequency or period
measurement.
Step 3: Press Range and choose the range for the measurement. The autorange feature (Auto) automatically selects
the range for the measurement based on the input. Autoranging is convenient, but it results in slower measurements
than using a manual range. Autoranging goes up a range at 120% of the current range, and down a range below 10%
of the current range.
Step 4: Press AC Filter and choose the filter for the measurement. The instrument uses three different AC filters that
enable you either to optimize low frequency accuracy or to achieve faster AC settling times following a change in input
signal amplitude.
The three filters are 3 Hz, 20 Hz, and 200 Hz, and you should generally select the highest frequency filter whose
frequency is less than that of the signal you are measuring, because higher frequency filters result in faster
measurements. For example, when measuring a signal between 20 and 200 Hz, use the 20 Hz filter.
If measurement speed is not an issue, choosing a lower frequency filter may result in quieter measurements,
depending on the signal that you are measuring.
Step 5: Press Gate Time and choose the measurement aperture (integration time) of 10 ms, 100 ms (default), or
1s.
For accurate displayed statistics of AC measurements in Front Panel mode, the default manual trigger
delay ([Acquire] > Delay Man) must be used.
48 Agilent Truevolt Series DMM Operating and Service Guide
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