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APPENDIX A – ELECTRICAL CALIBRATION
Note. The instrument is calibrated by the company prior to despatch and an electrical calibration should be carried out
only if the instrument's accuracy is suspect and suitably calibrated test equipment is available.
A1 Equipment Required
a) Millivolt source (cell input simulator), –20.0 to 180.0mV.
b) Millivolt source (temperature input simulator), 10.0 to 40.0mV.
c) Digital voltmeter (current output), 0 to 20mA.
d) Thermometer, to measure ambient temperature.
A2 Preparation
a) Switch off the mains supply. Disconnect the probe and retransmission output terminations from the instrument – see Fig. 4.4
or 4.5.
b) Connect the millivolt sources and the milliammeter to the appropriate terminals – see Fig. 4.4 or 4.5.
c) Switch on the mains supply to the instrument and allow ten minutes for the circuits to stabilize.
d) Select the Electrical Calibration Page and proceed as detailed in Section A3.
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