Agilent Technologies Switch/Measure manual Current Measurement Configuration

2Features and Functions

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.

10 mA

100 mA

1 A

Autorange

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 low frequency filter

Input Frequency	Default Settling Delay	Minimum Settling Delay
3 Hz to 300 kHz (Slow)	7 seconds / reading	1.5 seconds
20 Hz to 300 kHz (Medium)	1 second / reading	200 ms
200 Hz to 300 kHz (Fast)	0.12 seconds / reading	20 ms

•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:]CURRent:AC:BANDwidth {320200} [,(@<ch_list>)]

If you omit the optional <ch_list> parameter, the command applies to the internal DMM.

38 34980A User’s Guide