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8.11.5 Calibration Parameters
The user has access to a number of the instrument calibration constants namely
CTO, B0, and BG. These values are set at the factory and must not be altered.
The correct values are important to the accuracy and proper and safe operation
of the calibrator. Access to these parameters is available to the user only so that
in the event that the controller’s memory fails the user may restore these values
to the factory settings. The user should have a list of these constants and their
settings with the manual.
CAUTION: DO NOT change the values of the calibration constants from
the factory set values. The correct setting of these parameters is important
to the safety and proper operation of the calibrator.
The calibration parameters menu is indicated by,
CAL
Calibration parameters menu
Press “SET” five times to enter the menu.
8.11.5.1 CTO
Parameter CTO sets the calibration of the over-temperature cut-out. This is not
adjustable by software but is adjusted with an internal potentiometer. This pa-
rameter should read between 150 and 170.
8.11.5.2 BO and BG
These parameters calibrate the accuracy of the temperature set-point. These are
programmed at the factory when the instrument is calibrated. Do not alter the
value of these parameters. If the user desires to calibrate the instrument for im
-
proved accuracy then calibrate R0 and ALPHA according to the procedure
given in Section 10.
8.11.5.3 SCO
This parameter is used at the factory for testing purposes and should not be al
-
teredbytheuser.
42 Hart Scientific
8 Controller Operation