Filter
Top Products
Calibration
Calibrating for Readback Accuracy
84 Operating Manual for XFR 2.8kW Series Power Supply
Calibrating for Readback Accuracy
The factory calibrates the offset and range of the output voltage and current monitor
circuits to within 1% for the default 0-10 Vdc scales. You may need to recalibrate
when you select the 0-5 Vdc scale or when you switch back to the 0-10 Vdc scale
after previously calibrating for 0-5 Vdc operation.
See Section for instructions to remove the cover and any option card. Follow all
procedure steps in the sequence given.
Output
Voltage
Monitor
Circuit
Calibration
1. Ensure that the power supply is turned OFF. Disconnect any load.
2. Set SW1 switch 5 OPEN to select 0-5 V output voltage monitor range, CLOSED
for 0-10 V.
3. Connect a DVM across the power supply output to read the output voltage.
Connect a second DVM between the rear panel J2 connector terminals 10
(output voltage monitor) and 9 (voltage monitor signal return).
4. Turn the power supply ON.
5. Set the power supply output voltage to 1% of the model-rated output.
6. Adjust the output voltage monitor offset (R397) until the monitor DVM reads
1% of the readback scale. (50 mVdc for 0-5 V readback or 100 mVdc for
0-10 Vdc readback.)
7. Set the power supply output voltage to the model-rated maximum.
8. Adjust the output voltage monitor range (R387) until the monitor DVM reads
100% of the readback scale. (5 Vdc for 0-5 V readback or 10 Vdc for 0-10 Vdc
readback.)
Repeat this procedure until the monitor signal is adjusted to power supply
specifications (see Section 1) or to the accuracy that your application requires.