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36 34980A User’s Guide
2 Features and Functions
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.
• 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.
AC low frequency filter
Input Frequency Default Settling Delay Minimum Settling Delay
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