Section 6 Calibration; Display Offset; Recalibrating To A Remote Standard; Sensor Error Correction (Function .9) - Omega CN9000A Series User Manual

SECTION 6 CALIBRATION

6.1 DISPLAY OFFSET

The CN9000A is not designed to allow field calibration.
A one point "Display Offset" can be programmed from the front of
the unit using Function .9 sensor Error Correction (Display Bias).
This function should not be used in normal operation.
Display Bias can be used to correct for small errors in calibration
of a particular thermocouple or the CN9000A. It should never be
used as a fudge factor to account for temperature gradients in a
system.
Note that this is not a true calibration since the entire curve is
shifted, and although the unit can be recalibrated at one point, the
reading can be off at another temperature since the temperature
curve is not exactly linear. Therefore, the Display Bias should be
attempted as close to the desired setpoint temperature possible.

6.2 RECALIBRATING TO A REMOTE STANDARD

To enable the CN9000A calibration to match an external meter
datalogger etc. (i.e. "Reference" reading).
6.2.1 Sensor Correction (Function .9)
Provides correction at one single temperature.
Temperature
That
'Reference'
Reads
Negative
adjustment
Temperature That CN9000A Reads
Figure 6-1. Sensor Error Graph
Ideal (i.e.
readings
match)
Positive
adjustment
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