Features and Functions 3
Keysight 34980A Mainframe User’s Guide 143
Current Measurement Configuration
This section contains information to help you configure the instrument for making
current measurements on the 34921A multiplexer module. The module has four
fused channels for direct dc and ac current measurements on the ranges shown
below.
Current measurements are allowed only on channels 41 through 44 on the
34921A module.
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 current and ac voltage measurements only.
AC Filter Settings for Current 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
10 mA 100 mA 1 A Autorange
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
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