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 valuesare 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 eventthat the controller’s memory fails the user may restore these values
to the factorysettings. 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 indicatedby,
CAL Calibration parameters menu
Press “SET” fivetimes to enter the menu.
8.11.5.1 CTO
ParameterCTO sets the calibration of the over-temperaturecut-out. This is n ot
adjustable by software butis adju sted with an internal potentiometer.This pa-
rameter shouldread between 150 and 170.
8.11.5.2 BO and BG
These parameters calibrate the accuracyof the temperatureset-point. These are
programmed atthe factory when the instrument is calibrated. Do not alter the
valueof these parameters. If the user desires to calibrate the instrument for im-
provedaccuracy then calibrate R0 and ALPHA according to the procedure
givenin Section 10.
8.11.5.3 SCO
This parameteris used at the factory for testing purposes and should not be al-
teredbytheuser.
42 HartScientific
8Controller Operation