[SENSe:]TEMPerature:TRANsducer:TYPE

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

Syntax

[SENSe:]TEMPerature:TRANsducer:TYPE <probe_type> [, (@<ch_list>)]

[SENSe:]TEMPerature:TRANsducer:TYPE? [(@<ch_list>)]

Description

This command selects the temperature transducer probe type to use for measurements 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
<probe_type>	Discrete	{TCouple|RTD|FRTD|THERmistor}	TCouple
<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.

• Thermocouple measurements directed at the internal DMM (i.e., no <ch_list> specified) require that a fixed reference junction temperature be used (see [SENSe:]TEMPerature:TRANsducer:TCouple:RJUNction:TYPE command).

• For 4-wire RTD measurements (FRTD), 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>).

• The instrument selects thermocouple as the probe type 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 "TC", "RTD", "FRTD", or "THER" for each channel specified. Multiple responses are separated by commas.

Examples

The following command selects the RTD probe type on channels 3 and 13 in slot 1.

TEMP:TRAN:TYPE RTD, (@1003,1013)

The following query returns the probe selections on channels 3 and 13 in slot 1.

TEMP:TRAN:TYPE? (@1003,1013)

Typical Response:  RTD,RTD

See Also

CONFigure:TEMPerature