Chapter 12. Calibration; Precautions Before Calibration; Equipment Needed - Honeywell DCP551 Mark ΙΙ User Manual

Chapter 12. CALIBRATION

This chapter covers the field calibrations procedures for the inputs, outputs and various functions of the DCP551
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 DCP551 mark II use and operation.

Precautions before calibration

Equipment needed

Apply power and allow the controller to warm up for 2 hours before you calibrate the
DCP551 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 DCP551 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.
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 300Ω with a
resolution of more than 0.01Ω)
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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