Keysight 34980A - AC Low Frequency Filter

Features and Functions 3
Keysight 34980A Mainframe User’s Guide 141
If you omit the optional <ch_list> parameter, the command applies to the
internal DMM.
AC Low Frequency Filter
The instrument uses three different ac filters which enable you to either optimize
low-frequency accuracy or achieve faster ac settling times. The instrument selects
the slow (3 Hz), medium (20 Hz), or fast (300 Hz) filter based on the input
frequency that you specify for the selected channels or the internal DMM.
Applies to ac voltage and ac current measurements only.
AC Filter Settings for Voltage Measurements:
–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
filter based on the frequency you specify (see table above).
[SENSe:]VOLTage:AC:BANDwidth {3|20|200} [,(@<ch_list>)]
If you omit the optional <ch_list> parameter, the command applies to the
internal DMM.
Input Frequency Default Settling Delay M i n i m u m S e t t l i n g D e l ay
3 Hz to 300 kHz (Slow)
20 Hz to 300 kHz (Medium)
200 Hz to 300 kHz (Fast)
7 seconds / reading
1 second / reading
0.12 seconds / reading
1.5 seconds
200 ms
20 ms