Features and Functions 3
Keysight 34980A Mainframe User’s Guide 145
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.
Timeouts for Specified Frequency Range Settings:
–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.
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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