Keysight 34420A - Thermocouple Measurements

3 Features and Functions
86 Keysight 34420A User’s Guide
Thermocouple Measurements
– The thermocouple must be connected to the Channel 2 inputs. Be sure to
observe the correct polarity. Thermocouple connections are shown on
page 30.
– Thermocouple measurements require a reference junction temperature. You
can input a known fixed junction temperature, use an external thermistor
temperature, or use the internal thermistor temperature as the reference
junction temperature.
– Front Panel operation: Set T/C as the probe type under the 1: PROBE TYPE
command in the TEMPerature menu.
Select the thermocouple type under the 4: T/C TYPE command in the
Temperature menu.
Set the reference junction temperature source under the 5: COLD JUNCT
command in the TEMPerature menu.
If you used a FIXed reference junction temperature, set the reference
temperature under the 6: JUNCT TEMP command in the TEMPerature menu. The
number entered must be in the range of –1 °C to 55 °C.
– Remote operation: use the following commands for temperature
measurements using thermocouples:
CONFigure:TEMPerature TC,{B|E|J|K|N|R|S|T}[,1,<resolution>]
MEASure:TEMPerature? TC,{B|E|J|K|N|R|S|T}[,1,<resolution>]
SENSe:
FUNCtion "TEMPerature"
TEMPerature:TRANsducer
:TYPE TC
:TCouple
:TYPE {B|E|J|K|N|R|S|T}
:RJUNction:TYPE {FIXed|INTernal|THERmistor}
:RJUNction {<reference>|MIN|MAX}
NOTE
The accuracy of the measurement is very dependent upon the thermocouple
connections and the reference junction temperature. Use a fixed temperature
reference for highest accuracy measurements. The internal thermistor reference
produces the lowest accuracy measurements. See page 290 for a discussion of
the reference junction temperature measurements.