Calibration of the Accelerating Rate Calorimeter is necessary such that a stable isothermal temperature will exist during the Seek mode. It is not a calibration in the usual sense of the word as it is more of an instrument setup, however the term calibration has historically been used.
The calibration test uses a specific method to measure the isothermal stability and minimise the temperature drift. It is usual to calibrate over the temperature range 50 - 400°C to obtain a stability of greater than 0.01°C/min. This is appropriate when standard tests are required.
The calibration is required because in use the Accelerating Rate Calorimeter compares the temperature of the “bomb thermocouple” with that of the “side zone” thermocouple. Though at an isothermal temperature these will read the same temperature, the output in mV will be unlikely to be the same.
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Reference:
ARC Technical Information Sheet No. 70, Thermal Hazard Technology, UK
