CONFigure:TEMPerature

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

Syntax

CONFigure:TEMPerature {<probe_type>|DEF}, {<type>|DEF} [,1 [,{<resolution>|MIN|MAX|DEF}] ] [, (@<ch_list>)]

Description

First, this command resets all measurement parameters on the specified channels to their default values. Then, configures the channels for temperature measurements but does not initiate the scan. If you omit the optional <ch_list> parameter, this command applies to the internal DMM, independent of any channels or a scan list.

The CONFigure command does not place the instrument in the "wait-for-trigger" state. Use the INITiate or READ? command in conjunction with CONFigure to place the instrument in the "wait-for-trigger" state.

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

Parameters

Remarks

• For temperature measurements, the instrument internally selects the range; you cannot select which range is used. In the command syntax, be sure to include "1" as shown for the <range> parameter (preceding the <resolution> parameter).

• 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.

• When you specify a range of channels with this command, any channels that are invalid will be ignored (no error will be generated) but the first and last channel in the range must be valid for the selected function. The Analog Bus relays (numbered s911, s912, s913, etc.) on the multiplexer and matrix modules are ignored if they are included in a range of channels. An error will be generated if an Analog Bus relay is specified as the first or last channel in a range of channels.

• For thermocouple measurements, the instrument internally selects the 100 mV range. For thermistor and RTD measurements, the instrument autoranges to the correct range for the transducer resistance measurement. Specify the paired channel in the lower bank (source) as the <ch_list> channel.

• Thermocouple measurements require a reference junction temperature (see [SENSe:]TEMPerature:TRANsducer:TCouple:RJUNction:TYPE command). For the reference junction temperature, you can use an internal measurement on the module's terminal block (34921A only), an external thermistor or RTD measurement, or a known fixed junction temperature. If you select an external reference, the instrument makes thermocouple measurements relative to a previously-stored RTD or thermistor measurement stored in the reference register. For more information and examples, see the following commands:
  
  [SENSe:]TEMPerature:TRANsducer:FRTD:REFerence
  [SENSe:]TEMPerature:TRANsducer:RTD:REFerence
  [SENSe:]TEMPerature:TRANsducer:THERmistor:REFerence
  
  By default, a fixed reference junction temperature of 0.0 °C is used (see [SENSe:]TEMPerature:TRANsducer:TCouple:RJUNction command).

• If you select autoranging (by specifying "AUTO" or "DEF"), an error will be generated if you specify a discrete value for the <resolution> parameter. When autoranging is combined with a discrete resolution, the instrument cannot accurately resolve the integration time (especially if the input signal is continuously changing). If your application requires autoranging, be sure to specify "DEF" for the <resolution> parameter, or omit the parameter from the command and use the [SENSe:]TEMPerature:NPLC command to specify the desired integration time.  

• Since this command resets all measurement parameters on the specified channels to their default values, be sure to send the CONFigure command before setting any other measurement parameters. For example, to change the sample count, first send the CONFigure command (sets the sample count to "1") and then change the sample count to the desired value (see SAMPle:COUNt 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>).

• Since channels are automatically paired for 4-wire resistance measurements (see previous Remark), attempts to re-configure the paired channel in Bank 2 will result in an error. In addition, if the Bank 2 channel was previously configured to be part of the active scan list (see ROUTe:SCAN command) and is then re-configured to be paired with a Bank 1 channel, an error will be generated and the previous scan list will be cleared. For example:

CONF:VOLT:DC (@1021)  !Configure Bank 2 channel for dc voltage measurements
ROUT:SCAN (@1001:1040)  !Add channels to scan list
CONF:FRES (@1001)  !Generates error and clears scan list

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

• For 4-wire RTD measurements, the instrument automatically enables the autozero function.

• The *RST command will clear the scan list and set all measurement parameters to their factory settings. The Instrument Preset (SYSTem:PRESet command) will not clear the scan list; however, this command will clear reading memory and all stored statistical data.

Examples

The following program segment configures the instrument for B-type thermocouple measurements on channel 4 in slot 3. The READ? command places the instrument in the "wait-for-trigger" state, scans the channel once, and then sends the reading to reading memory and the instrument's output buffer. The default resolution (fixed at 6½ digits) is used for the measurement (assumes default temperature units).

CONF:TEMP TC,B,(@3004)
ROUT:SCAN (@3004)
READ? (@3004)

Typical Response:  +3.65640000E+01

The following program segment configures the instrument for 5 kΩ thermistor measurements on channels 3 and 8 in slot 1. The INITiate command places the instrument in the "wait-for-trigger" state, scans the channels once, and stores the readings in memory. The FETCh? command transfers the readings from reading memory to the instrument's output buffer. This 2-wire measurement is made with 0.1 °C resolution (assumes default temperature units).

CONF:TEMP THER,5000,1,0.1,(@1003,1008)
ROUT:SCAN (@1003,1008)
INIT
FETC?

Typical Response:  +2.47150000E+01,+3.12130000E+01

The following program segment configures the internal DMM for a 2-wire RTD measurement (no <ch_list> is specified). The READ? command places the internal DMM in the "wait-for-trigger" state, initiates a trigger, and then sends the reading to reading memory and the instrument's output buffer. The default resolution (fixed at 6½ digits) is used for the measurement (assumes default temperature units).

CONF:TEMP RTD,85  !Applies to the internal DMM
READ?

Typical Response:  +2.12320000E+01

See Also

CONFigure?

FETCh?

INITiate

MEASure:TEMPerature?

READ?

ROUTe:SCAN

[SENSe:]TEMPerature:NPLC

[SENSe:]TEMPerature:TRANsducer:FRTD:REFerence

[SENSe:]TEMPerature:TRANsducer:RTD:REFerence

[SENSe:]TEMPerature:TRANsducer:TCouple:IMPedance:AUTO

[SENSe:]TEMPerature:TRANsducer:THERmistor:REFerence

[SENSe:]TEMPerature:ZERO:AUTO

SWEep:COUNt

UNIT:TEMPerature