UNIT:TEMPerature

34980A

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UNIT:TEMPerature

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

Syntax

UNIT:TEMPerature <units> [, (@<ch_list>)]

UNIT:TEMPerature? [(@<ch_list>)]

Description

This command selects the temperature units (°C, °F, or Kelvins) on the specified channels. If you omit the optional <ch_list> parameter, this command applies to the internal DMM, independent of any channels or a scan list.

The following table shows which temperature transducers are supported by each of the multiplexer modules.

 

Thermocouple

RTD
2-Wire

RTD
4-Wire

Thermistor

 

34921A
Armature
Multiplexer

 Yes1

Yes

Yes

Yes

 

34922A
Armature Multiplexer

Yes2

Yes

Yes

Yes

 

34923A
Reed Multiplexer
(2-Wire)

Yes2,3

Yes4

Yes4

Yes5

 

34923A
Reed Multiplexer
(1-Wire)

Yes2,3

Yes4

No

Yes5

 

34924A
Reed Multiplexer

Yes2,3

Yes4

Yes4

Yes5

 

34925A
FET Multiplexer
(2-Wire)

Yes2

No

Yes5

No

 

34925A
FET Multiplexer
(1-Wire)

Yes2

No

No

No

 

1 Optional 34921T Terminal Block is required for thermocouple measurements with built-in internal reference junction.
2 A fixed or external reference junction temperature is required for thermocouple measurements with this module.
3 Impact of higher offset voltage specification (< 50 µV) must be taken into consideration.
4 1 kΩ or higher range used unless 100Ω series resistors are bypassed on module.
5 10 kΩ or higher range used for loads over approximately 300Ω due to series resistance of FET channels.

Parameters

Name

Type

Range of Values

Default Value

<units>

Discrete

{C|F|K}

C (Celsius)

<ch_list>

Numeric

One or more channels in the form (@sccc).

If <ch_list> is omitted, this command applies to the internal DMM.

Remarks

  • 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.

  • You can mix temperature units on different channels within the instrument and on the same module.

  • Setting the Mx+B (see CALCulate:SCALe:UNIT command) measurement label to °C, °F, or K has no effect on the temperature measurement units currently selected.

  • The CONFigure and MEASure? commands automatically select °C.

  • The instrument sets the temperature units to °C 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 "C", "F", or "K" for each channel specified. Multiple responses are separated by commas.

Examples

The following command sets the temperature units to °F on channels 12 and 13 in slot 7.

UNIT:TEMP F,(@7012,7013)

The following query returns the temperature units selected on channels 12 and 13 in slot 7.

UNIT:TEMP? (@7012,7013)

Typical Response:  F,F

See Also

CALCulate:SCALe:UNIT

CONFigure:TEMPerature

MEASure:TEMPerature?

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