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(3) Thermocouple input
Adjustment is done on three input terminals of each input terminal unit: INPUT CH1, CH6 and
CH12. For thermocouple adjustment, connect to CH1, CH6 and CH12 as shown in the figure below.
The thermocouple input can only become as small as the amount of thermo-electromotive force
equivalent to the temperature at the terminals. The recorder compensates for this amount (called
reference junction compensation). The input used for adjustment comes from the reference junction
compensator (at a standard 0
°
C). In other words, the reference junction compensator is used to subtract
the reference junction compensation amount.
■
INPUT CH1, CH6 and CH12 are used for
adjusting 3 elements for measuring the
terminal temperature.
Input terminals
(+)
(-)
Ice + distilled water
Vacuum bottle
Thermocouple wire*
Test tube
Silicone oil
Reference junction
compensator