[SENSe:]TEMPerature:TRANsducer:FRTD:OCOMpensated
Syntax
[SENSe:]TEMPerature:TRANsducer:FRTD:OCOMpensated <mode> [, (@<ch_list>)]
[SENSe:]TEMPerature:TRANsducer:FRTD:OCOMpensated? [(@<ch_list>)]
Description
Offset compensation removes the effects of any dc voltages in the circuit being measured. The technique involves taking the difference between two resistance measurements on the specified channels, one with the current source turned on and one with the current source turned off. 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
Parameters
|
Name |
Type |
Range of Values |
Default Value |
|
<mode> |
Boolean |
{OFF|0|ON|1} |
OFF|0 |
|
<ch_list> |
Numeric |
One or more channels in the form (@sccc). |
If <ch_list> is omitted, this command applies to the internal DMM. |
Remarks
Applies only to 2-wire and 4-wire RTD measurements on the 100Ω, 1 kΩ, and 10 kΩ ranges. Once enabled, offset compensation is applied to both 2-wire and 4-wire RTD measurements on the specified channels.
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:]TEMPerature:TRANsducer:RTD:OCOMpensated command).
For 4-wire resistance measurements, the instrument automatically pairs channel n in Bank 1 with channel n+20 in Bank 2 (34921A, 34923A) 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).
The CONFigure and MEASure? commands automatically disable offset compensation.
The instrument disables offset compensation 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 enables offset compensation 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.
TEMP:TRAN:FRTD:OCOM ON,(@1003,1013)
The following query returns the offset compensation settings on channels 3 and 13 in slot 1.
TEMP:TRAN:FRTD:OCOM? (@1003,1013)
Typical Response: 1,1