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9-5. Wiring and Environment for Input Adjustment
1. Preparation
(1) Turn OFF the power switch and perform the wiring depending on the input signal (see the figure below).
Connect to the input terminal of the adjustment target channel.
(2) Attach the terminal cover.
(3) Turn ON the power switch and select the 1-point display (fixed) mode.
(4) Display the adjustment target channel.
(5) Energize the unit for at least 30 minutes (an hour or more is ideal) and then perform an adjustment.
2. How to adjust
(1) Set a tester (standard DC voltage generator or precision variable resistor) to an input value equivalent to the
adjustment target value.
(2) At this time, read the digital display and check if the error is within the specified accuracy range.
(3) Next, change to the adjustment target channel and adjust it likewise.
(4) Adjust also the trace printing position.
* The accuracy of the unit is rated at an ambient temperature of 23°C ±2°C. Ensure safety of the
surrounding environment.
* When using the shift adjustment function to adjust measured value, the shifted value should be taken into
account.
* When you change the wiring with the terminal cover removed, energize the unit for at least 30 minutes
after attaching the terminal cover and then perform adjustment.
The accuracy of the unit is ±0.1%. Therefore, you
need to use a tester having higher degree of accuracy
to perform proper adjustment. Also, attention should
be paid to the thermocouple error.
Note that a tester requires time to be stabilized to
ensure its accuracy and stability.
Tester accuracy
Note 1
Make sure that the reference junction temperature is
0°C. When using an electronic reference junction
compensator, read its instruction manual. Also, the
compensation accuracy should be checked.
Reference junction compensator
Note 2
When you use thermocouple input and set RJ to
“INT”, perform the type 1 wiring if a reference junction
temperature compensator is not available.
In this case, set RJ to “EXT” during adjustment only.
Note that error correction of reference junction
temperature compensation cannot be performed.
When reference junction temperature
compensator (RJ) is not available
Note 3