Features and Functions 4
Keysight 34970A/34972A User’s Guide 143
– Remote Interface Operation: You can enable or disable the automatic input
resistance mode on the specified channels. With AUTO OFF (default), the input
resistance is fixed at 10 MΩ for all ranges. With AUTO ON, the input resistance
is set to >10 GΩ for the three lowest DC voltage ranges. The MEASure? and
CONFigure commands automatically select AUTO OFF.
INPUT:IMPEDANCE:AUTO ON,(@103)
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, medium, or fast filter based on the input frequency that you specify for
the selected channels.
Applies to AC voltage and AC current measurements only.
– The instrument selects the medium filter (20 Hz) when the function is changed
or 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: First, select the AC voltage (or AC current) function on
the active channel. Then, go to the Advanced menu and select the slow filter
(3 Hz), medium filter (20 Hz), or fast filter (200 Hz) for the active channel. The
default is the medium filter.
LF 3 HZ:SLOW
– 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). The MEASure?
and CONFigure commands automatically select the 20 Hz (medium) filter.
SENS:VOLT:AC:BAND 3,(@203)
Input frequency Default settling delay Minimum settling delay
3 Hz to 300 kHz (Slow)
20Hz to 300 kHz (Medium)
200 Hz to 300 kHz (Fast)
7 seconds / reading
1 second / reading
0.12 seconds / reading
1.5 seconds
0.2 seconds
0.02 seconds
Select the slow filter (3 Hz)
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