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3.1
System Calibration Method
The TMS 9250 features nine-point linearization and all calibration are achieved using the
following parameters:
•
#CalSteps
•
#CalReset
•
#CalValue1
•
#CalValue2
•
#CalValue3
•
#CalValue4
•
#CalValue5
•
#CalValue6
•
#CalValue7
•
#CalValue8
•
#CalValue9
The minimum number of calibration points is 2. Calibration points can be created in any order
provided that the values they contain are in ascending order starting with #CalValue1.
Therefore, the lowest or the most negative (counter-clockwise) calibration point should be
designated as #CalValue1.
The number of calibration points that are in use is set by the parameter "#CalPoints". Any
change to the value of #CalPoints should be followed by the issuance of a "#CalReset"
command, to clear the old calibration values from the EEPROM memories.
Calibration is achieved by applying known loads at each of the calibration points that are
selected for use and then writing the engineering units value to the appropriate #CalValuex
parameter.
The analog outs are pre-calibrated in the factory, so calibration of the input to the required
output range is automatic and is dependent on the values entered for the parameters:
•
#AnOutHigh
•
#AnOutLow
#AnOutHigh and #AnOutLow are written-to using the engineering unit's value at which the
analog outputs are required to give the maximum and minimum outputs.
Available analog outputs are: Voltage range is –10 to +10 volts.
Current output range is 4 to 20 mA. Frequency range is 5 kHz to 15 kHz or alternatively, 40
kHz to 80 kHz.
Rev B
April 2012
© 2012 – Honeywell International Inc. All rights reserved
3. Calibration
TMS 9250 Product User Manual
3. Calibration
008-0738-00
31
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