Calibration Of Reference Junction Compensation - Toho Electronics TRM-10C Instruction Manual

(3) Calibration of Reference Junction Compensation

Conduct this calibration in case of thermocouple input.
Wiring
◯
Digital Voltmeter
◯
◯
Precision
Voltage(Current)
Generator
◯
Copper Wires
Example) Connect the input to Channel 1 and setting the calibration when the thermocouple
input value (TRM-10C measurement) is -0.5 (input 0℃), the measured RJC
temperature is 24.5℃.
1) Check the Process variable when impressing 0.000mV±2μV to Channel 1 by the voltage
generator beforehand. (In this example, it is -0.5℃.)
2) Check the terminal temperature of Channel 1 at the data calibration in the engineering
mode (Reference junction compensation). (In this example, it is 24.5℃.)
3) Setup the value which added a part for the difference with true value (0.5℃) as the right
RJC temperature.
［24.5－（－0.5）＝25.0℃］
Conduct calibration according to the instructions in 7.2.12 Data Calibration (Calibration of reference
junction compensation).(See page 84)
[Note]
① This calibration is conducted when compensation by the recorder's built-in temperature sensing
element (INT: internal compensation) is selected as the reference junction compensation
method.
② Wire to Channels 1 and 4 to conduct calibration.
③ After wiring, attach the terminal covers and wait for 5 minutes or more. Then, conduct
calibration.
＋
－
＋
－
Freezing Point
Cold Junction
Compensator
(Iced Water)
―101―
Thermocouple Wires or Compensation Lead Wires
Be sure to attach a terminal cover.
◯
＋ ＋ ＋
＋
＋
－ －
－
－
◯
－
TRM-10C Recorder
Input Terminals
HXPRM10mnCT001E