Honeywell DCP552 Mark II - Manual (Page 191)

Chapter 12. CALIBRATION
This chapter covers the field calibrations procedures for the inputs, outputs and various functions of the DCP550
mark II controller after shipment from the factory. When calibration is made in the field, the original factory data
is erased, and so the specified input/output accuracies of the controller cannot be assured. This manual is for users
who are conversant with DCP550 mark II use and operation.
■ Precautions before calibration
Apply power and allow the controller to warm up for 2 hours before you calibrate
the DCP550 mark II. Confirm that the test equipment needed for calibration has
stabilized.
Factory calibration has been made at a stable temperature of 23.0 °C (±2°C).
Calibrate the DCP550 mark II in this range, and where there are no significant
fluctuations in air temperature.
You must write newly calibrated data to EEPROM before exiting from calibration
mode, otherwise all new data will be lost.
If calibration equipment of a lower grade than specified below is used, calibration
results may be unsatisfactory.
■ Equipment needed
(1) Standard input source with ±0.02% accuracy (having more than 5 effective
digits and capable of generating both voltage and current outputs)
(2) Decade resistance box with ±0.02% accuracy (having a range of 10 to 300W
with a resolution of more than 0.01W)
(3) Digital ammeter with ±0.02% accuracy (measurable in the range of 4 to 20mA
with assured resolution of more than 0.01mA)
(4) Thermometer with ±0.1 °C accuracy (resolution of more than 0.1°C)
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