TB9100 Calibration Software User’s Manual Calibrating the Power Management Unit 29
Calibrating the Power Management Unit
There is only one calibration procedure for the PMU: calibrating its output
voltage.
Calibrating the PMU Output Voltage
Calibrating the PMU output voltage adjusts the voltage to be 28.00 V. This
procedure is only carried out when a replacement control card or
microprocessor is fitted to the PMU. Normally, the output voltage will be
accurate without calibration.
Note: Re-calibrating the PMU output voltage may in fact result in
it failing to meet the published specification of +/- 0.5% accuracy.
This is because control cards are calibrated in the factory under half-
load, giving a voltage that is closer to 28.00 V under varying loads.
To calibrate the output voltage
1. Make sure that the equipment is set up and that the Calibration Software is
connected to the reciter.
2. Select the PMU Calibration tab.
3. Double-click Output Voltage Calibration. The Calibrate Output
Voltage wizard appears.
4. Connect a digital multimeter to the PMU output and read the output
voltage.
5. Enter the voltage into the PMU Voltage box and click Calibrate.
6. When the wizard indicates that the calibration completed successfully, click
Finish.
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