Calibration
Calibrating for Readback Accuracy
Release 3.1
85
Output
Current
Monitor
Circuit
Calibration
1. Ensure that the power supply is turned OFF. Disconnect any load.
2. Set SW1 switch 6 OPEN to select 0-5 V output current monitor range, CLOSED
for 0-10 V.
3. Connect the shunt and DVM across the power supply output to read the output
current. Connect a second DVM between the rear panel J2 connector terminals
12 (output current monitor) and 11 (current monitor signal return).
4. Turn the current control fully counter-clockwise, then turn on the power supply.
5. Set the power supply’s output current to 1% of the model-rated output. See Note.
6. Adjust the output current monitor offset (R394) until the monitor DVM indicates
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 current to the model-rated output.
8. Adjust the output current monitor range (R383) until the monitor DVM indicates
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 specifications (see
Section 1. Features and Specifications) or to the accuracy that your application
requires.
Note
Calculate the required DVM reading using V= IR where V is the DVM reading, I is
the current, and R is the DC shunt resistance.
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