40 34980A User’s Guide
2 Features and Functions
Frequency Measurement Configuration
This section contains information to help you configure the instrument for
making frequency measurements.
Low Frequency Timeout
The instrument uses three different timeout ranges for frequency
measurements. The instrument selects the slow (3 Hz), medium (20 Hz),
or fast (300 Hz) filter based on the input frequency that you specify with
this command for the selected channels.
Applies to frequency measurements only.
• The
CONFigure and MEASure? commands automatically select the 20 Hz
(medium) filter.
• The instrument selects the default 20 Hz (medium) filter after a Factory
Reset (
*RST command). An Instrument Preset (SYSTem:PRESet command) or
Card Reset (SYSTem:CPON command) does not change the setting.
Front Panel Operation: DMM or Channel (Configure) > AC FILTER
Remote Interface Operation: Specify the lowest frequency expected in the
input signal on the specified channels. The instrument selects the
appropriate timeout based on the frequency you specify (see table above).
[SENSe:]FREQuency:RANGe:LOWer {3|20|200} [,(@<ch_list>)]
If you omit the optional <ch_list> parameter, the command applies to the
internal DMM.
Low frequency timeout
Input Frequency Timeout
3 Hz to 300 kHz (Slow)
20 Hz to 300 kHz (Medium)
200 Hz to 300 kHz (Fast)
1 second
100 ms
10 ms
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