[SENSe:]FRESistance:RANGe:AUTO

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

Syntax

[SENSe:]FRESistance:RANGe:AUTO <mode> [, (@<ch_list>)]

[SENSe:]FRESistance:RANGe:AUTO? [(@<ch_list>)]

Description

This command disables or enables autoranging for 4-wire resistance measurements on the specified channels. Autoranging is convenient because the instrument automatically selects the range for each measurement based on the input signal detected. 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

• 34922A Armature Multiplexer

• 34923A Reed Multiplexer (differential mode only)

• 34924A Reed Multiplexer

• 34925A FET Multiplexer (differential mode only)

Parameters

Name	Type	Range of Values	Default Value
<mode>	Boolean	{OFF|0|ON|1}	Autorange ON
<ch_list>	Numeric	One or more channels in the form (@sccc).	If <ch_list> is omitted, this command applies to the internal DMM.

Remarks

• For 4-wire resistance measurements, the instrument automatically pairs channel n in Bank 1 with channel n+20 in Bank 2 (34921A, 34923A, 34925A) or n+35 (34922A, 34924A) to provide the source and sense connections. For example, make the source connections to the HI and LO terminals on channel 2 in Bank 1 and the sense connections to the HI and LO terminals on channel 22 (or 37) in Bank 2. Specify the paired channel in Bank 1 (source) as the <ch_list> channel (channels in Bank 2 are not allowed in the <ch_list>).

• Four-wire measurements are not allowed on the multiplexer modules configured for the single-ended mode (see SYSTem:MODule:WIRE:MODE command).

• 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.

• Since 2-wire and 4-wire resistance are related functions, changing a measurement parameter for one function will also change the corresponding parameter for the other function (see [SENSe:]RESistance:RANGe:AUTO command).

• Autorange thresholds:

  Down range at:	<10% of range
  Up range at:	>120% of range

• With autoranging enabled, the instrument selects one of the following ranges based on the input signal detected:
  
       100Ω, 1 kΩ, 10 kΩ, 100 kΩ, 1 MΩ, 10 MΩ, 100 MΩ

• Selecting a discrete range (see [SENSe:]RESistance:RANGe command) will disable autoranging on the specified channels.

• The CONFigure and MEASure? commands automatically enable autoranging.

• The instrument enables autoranging 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 "0" (OFF) or "1" (ON) for each channel specified. Multiple responses are separated by commas.

Examples

The following command disables autoranging on channels 3 and 13 in slot 1. For this 4-wire measurement, the instrument automatically pairs these channels in Bank 1 with the corresponding channels in Bank 2.

FRES:RANG:AUTO OFF,(@1003,1013)

The following query returns the autoranging settings on channels 3 and 13 in slot 1.

FRES:RANG:AUTO? (@1003,1013)

Typical Response:  0,0

See Also

CONFigure:FRESistance

[SENSe:]RESistance:RANGe