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DR4300 Circular Chart Recorder
148 DR4300 Circular Chart Recorder Product Manual 12/03
5.4.3 Thermocouple Inputs Using an Ice Bath or Ice Point Reference
Refer to Figure 5-3 and wire the recorder according to the procedure given in Table 5-6.
Table 5-6 Set Up Wiring Procedure for Thermocouple Inputs Using an Ice Bath
Step Action
1
Connect the copper leads to the calibration source (see Figure 5-3).
2
Connect a length of thermocouple extension wire to the end of each copper lead and insert the
junction points into the ice bath.
3
Connect the other end of the thermocouple extension wires to the TB2 terminals on the printed
circuit assembly for the input channel being calibrated.
Main PCA
Pen 2
Main PCA
Pen 1
7
TB2
TB1
7
TB2
TB1
TB2
+
R
–
-
+
mV source
Copper
wires
Thermocouple
extension wires
Containers of
crushed ice
24092
Figure 5-3 Calibration Set Up Diagram for Thermocouple Inputs Using an Ice Bath