[SENSe:]CURRent:AC:BANDwidth

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[SENSe:]CURRent:AC:BANDwidth

Syntax

[SENSe:]CURRent:AC:BANDwidth {<filter>|MIN|MAX}[,(@<ch_list>)]

[SENSe:]CURRent:AC:BANDwidth? [{(@<ch_list>)|MIN|MAX}]

Description

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 (200 Hz) filter based on the input frequency that you specify with this command for the selected channels. If you omit the optional <ch_list> parameter, this command applies to the currently defined scan list.

Used With:

34901A 20 Channel Multiplexer (2/4-wire) Module (channels 21 and 22 only)

Parameters

Name Type Range of Values Default Value

<filter> Discrete {3|20|200} 20

<ch_list> Channel List
One or more channels, as shown:

(@321) - channel 21 on the module in slot 300.

(@221:222) - channels 21 through 22 on the module in slot 200.

(@121:122,222,321:322) - channels 21 and 22 on the module in slot 100, channel 22 on the module in slot 200, and channels 21-22 on the module in slot 300.

Note that the channels must be of the form s21 and s22, where s is the first digit of the slot number.
If you omit the optional <ch_list> parameter, this command applies to the currently defined scan list.

Name	Type	Range of Values	Default Value
<filter>	Discrete	{3\|20\|200}	20
<ch_list>	Channel List	One or more channels, as shown: (@321) - channel 21 on the module in slot 300. (@221:222) - channels 21 through 22 on the module in slot 200. (@121:122,222,321:322) - channels 21 and 22 on the module in slot 100, channel 22 on the module in slot 200, and channels 21-22 on the module in slot 300. Note that the channels must be of the form s21 and s22, where s is the first digit of the slot number.	If you omit the optional <ch_list> parameter, this command applies to the currently defined scan list.

Remarks

This command applies to AC current measurements only.

For the <filter> parameter, 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.

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 default 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.
The settling delay is controlled by the ROUTe:CHANnel:DELay command. You get the default delay with ROUTe:CHANnel:DELay:AUTO ON.

Return Format

The query returns 3 (slow), 20 (medium), or 200 (fast) for each channel specified. Multiple responses are separated by commas.

Examples

The following command selects the slow filter (3 Hz) on channels 21 and 22 in slot 100.

CURR:AC:BAND 3,(@121,122)

The following query returns the AC filter settings on channels 21 and 22 in slot 100.

CURR:AC:BAND? (@121,122)

Typical Response: 3,3

[SENSe:]CURRent:AC:BANDwidth