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Input
Calibration -
Calibration
Procedure
Release M
DR4500A Classic Series Circular Chart Recorder With or Without Control Product Manual
193
April 2017
Step
Operation
Press
Action/Result
4
Check the Cold Junction
Temperature
W ARNING
The
accuracy of the recorder
is directly affected by the
accuracy of this value.
Change this value only if
the zero and span
calibration procedures did
not bring the recorder
within the specified
accuracy requirements.
FUNC
The calculations for zero and span are now stored and
you will see:
Upper Display:
The cold junction temperature at
the rear terminals
Lower Display:
C-J TEMP
The value in the upper display is in the tenths of a
degree. It is the current reading of the temperature
as measured at the thermocouple terminals
(that is, at J2) and recognized by the recorder.
When using the Ice Bath method, this value should
be the terminal ambient temperature.
You can change this value, if it is in error, using
the ▲ or ▼ key.
5
Exit the Calibration Mode
LOWR
DISP
or
SET
UP
The recorder stores the calibration constants and exit
calibration mode.