[SENSe:]CURRent:AC:BANDwidth

Syntax | Description | Parameters | Remarks | Return Format | Examples

Syntax

[SENSe:]CURRent:AC:BANDwidth {<filter>|MIN|MAX|DEF} [, (@<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 internal DMM, independent of any channels or a scan list.

Used With:

• 34921A Armature Multiplexer (channels 41 through 44 only)

Parameters

Name	Type	Range of Values	Default Value
<filter>	Discrete	{3|20|200} MIN = 3 Hz (slow), MAX = 200 Hz (fast)	20 Hz (medium)
<ch_list>	Numeric	One or more channels in the form (@sccc). Current measurements are allowed only on channels 41 through 44 on the 34921A.	If <ch_list> is omitted, this command applies to the internal DMM.

Remarks

• 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

• If you omit the optional <ch_list> parameter, the configuration applies to the internal DMM, independent of any channels or a scan list (any existing scan list is not redefined). An error is generated if the internal DMM is not installed or is disabled.

• 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.

Return Format

The query command 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 41 and 42 in slot 1.

CURR:AC:BAND 3,(@1041,1042)

The following query returns the ac filter settings on channels 41 and 42 in slot 1.

CURR:AC:BAND? (@1041,1042)

Typical Response:  3,3

See Also

CONFigure:CURRent:AC