
105
(3) Calibration of Reference Junction Compensation
Calibrate the reference junction compensation in the case of thermocouple input.
(Example) Connecting the input to Channel 1, and setting the calibration when the thermocouple
input value is -0.5
(input 0
), and the measured RJC temperature is 24.5
.
1) Check the Process variable when impressing 0.000 mV 2
V 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) Add the difference (0.5
) to the true value, then set as a correct RJC temperature.
[24.5-(-0.5)=25.0
]
Calibrate RJC according to the instructions in Section 7.2.12 Data Calibration (Calibration of RJC).
(See p.91.)
Thermocouple Wires or Compensation Lead Wires
Precision
Voltage(Current)
Generator
HR-701 (702) Recorder
Input Terminals
Digital Voltmeter
Freezing Point
Cold Junction
Compensator
(Iced Water)
+
+
-
-
-
-
+
+
Be sure to attach a terminal cover.
Copper Wires
Wiring
+
-
+
-
+
-
[Note]
(1) This calibration is conducted when compensation by the recorder's built-in temperature
sensing element (INT: internal compensation) is selected as a reference junction compensation
method.
(2) Wire Channels 1 and 2 to calibrate.
(3) After wiring, attach the terminal covers and wait for 5 minutes or longer. Then, perform
calibration.
Calibration
Summary of Contents for HR-700
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