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?