VXi VT1422A 사용자 설명서

Thermocouple measurements are voltage measurements that the EU 
conversion changes into temperature values based on the <sub_type> 
parameter and latest reference temperature value.

•

For Thermocouples the <sub_type> parameter can specify CUSTom, 

E, EEXT, J, K, N, R, S, T  (CUSTom is pre-defined as Type K, no 
reference junction compensation; EEXT is the type E for extended 
temperatures of 800

°

F or above).

To set channels 32 through 40 to measure temperature using type E 
thermocouples:

SENS:FUNC:TEMP TC, E, (@132:140)

(see following section to configure a TC reference measurement)

The isothermal reference temperature is required for thermocouple 
temperature EU conversions. The Reference Temperature Register must be 
loaded with the current reference temperature before thermocouple channels 
are scanned. The Reference Temperature Register can be loaded two ways:

1. By measuring the temperature of an isothermal reference junction 

during an input scan.

2. By supplying a constant temperature value (that of a controlled 

temperature reference junction) before a scan is started.

This operation requires two commands, the [SENSe:]REFerence command 
and the [SENSe:]REFerence:CHANnels command.

The [SENSe:]REFerence <type>, <sub_type>,[<range>,](@<ch_list>) 
command links channels to the reference temperature EU conversion.

•

The <ch_list> parameter specifies the sense channel that are 

connected to the reference temperature sensor.

•

The <type> parameter can specify THERmistor, RTD, or CUSTom. 

THER and RTD, are resistance temperature measurements and use the 
on-board 122 µA current source for excitation. CUSTom is 
pre-defined as a Type E thermocouple which has a thermally 
controlled ice point reference junction.