CI Systems ControlMaster SR-800R, Руководство по эксплуатации

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CI Systems SR-800R
10. Appendix A: Calibration Methods
There are two different versions of SR800 extended area blackbodies supported by CI
Systems, with two distinctly different calibration methodologies:
1. The original "fixed probe" SR800 blackbody systems are calibrated via a
standalone calibration instrument (CK80 or CK800 depending on the date of
manufacture). With this methodology, the temperature reading of the sensor
permanently installed in the blackbody emitter plate is referenced to the reading
of the master temperature sensor connected to the CK80/800 as the temperature is
modulated across the entire operating range of the blackbody.
The resultant offsets are programmed into a calibration table that is stored in the
head of the blackbody. Calibration data generated by this method is influenced by
slight thermal gradients that exist between the two physical locations where the
temperature sensors are inserted into the emitter plate during calibration.
2. The newer SR-800R blackbody system is equipped with a removable temperature
sensor. This sensor undergoes a standalone calibration in a thermal bath
generating a new calibration table (resistance,
Ω vs temperature, ºC). The
resultant calibration table is programmed into the blackbody head. Because the
TSC (Temperature Sense Card contained in the blackbody head) is a very
accurate and consistent ohmmeter, a calibrated sensor can be fitted into any
blackbody head and maintain calibration and traceability. With this method we
only use one temperature sensor located in the emitter eliminating the need for a
separate reference sensor located in a different spot on the emitter plate for
calibration.
With this methodology, the resulting temperature reading can be slightly different
from the reading obtained using the original "fixed probe" calibration method due
to the slight temperature gradients that can exist between two different sensor
locations in the emitter plate. This temperature differential is easiest to witness at
high temperatures, while at near ambient temperatures the difference between two
methods is very small. The discrepancy is primarily driven by thermal gradients
between different sensor locations and stays well within the overall system
uncertainty specifications.
605-7040 Operation Manual
Rev D
10-1
June 2013
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