Installation manual
900M050U00 Athena Controls, Inc. 13-1
13. Calibration Function – Not Required for
Configuration
13.1 Introduction
The CaLCaL (calibration) menu does not contain configuration parameters. Instead it is used
to display the values for which a simulated input should be applied to the controller input
terminals during calibration of the zero offset (CALoCALo) and the span adjustment (CAHiCAHi). It
is also used to initiate the calibration operation after the controller has been prepared as
described in Section 18.
Read Section 18 before trying to calibrate the controller.
The calibration menu is available only when the security access level is set to FACtFACt
(factory).
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13.2 Calibration Is Not Usually Required
You do not have to calibrate every new controller. When a controller was ordered, you
specified an input type for which the unit was calibrated at the factory. This is not the
specific type chosen with the input menu tYPEtYPE (type) parameter, such as J
thermocouple, or 0 to 20 mA linear. In the context of ordering the controller, “type” refers
to these choices:
• RTD
• compressed RTD
• thermocouple
• millivolt linear
• volt linear
• current linear input
The controller was calibrated at the factory for the type of input specified. If you use the
controller with a different type of input, you must recalibrate as described in Section 18
unless you ordered the “Calibrate All” input option.
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For example, if you specified when you ordered the controller that you planned to use a
thermocouple as the sensor, then you can use the input menu tYPEtYPE (type) parameter to
choose any thermocouple type: B, C, E, J, K, N, NNM, R, S, T, or Platinel II. The
controller will be calibrated appropriately at the factory. However, if you ordered
thermocouple calibration, but decide to use the controller with an RTD sensor, then you
should recalibrate before using the controller.
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The access level in all new 16C, 18C, and 25C controllers is set to CnF9CnF9 at the factory. Instructions
for changing the access level are in Section 17.
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To determine whether the controller in hand was calibrated at the factory for all input types, check the
model number on the label on the controller. The meaning of each character in the model number is in
the installation manual supplied with the controller.