AMETEK XFR 2800 Watt Series - Manual (Page 85)

Calibrating for Readback Accuracy
TM-F2OP-C1XN-01 5-7
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 “Calibration Setup” on page 5–2 for instructions to remove the cover
and any option card. Follow all procedure steps in the sequence given.
Output Voltage Monitor Circuit Calibration
To perform 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 Appendix A, “Specifications”) or to the accuracy that
your application requires.