American Magnetics 12200PS DC Power Supply (CE-Marked) - Manual (Page 55)

OPERATING MANUAL CALIBRATION
Release 1.0 (98/07) 5-3
5.3 Calibrating for Programming Accuracy
The factory calibrates the offset and range of the voltage and current programming circuits to within 1% for the
default 0-10Vdc programming signals. You may need to recalibrate when you use 0-5Vdc programming or when
you switch back to 0-10Vdc programming after previously calibrating for 0-5Vdc programming.
See Section 5.2 to remove the cover and any option card. Follow all procedure steps in the sequence given.
5.3.1 Voltage Programming Circuit Calibration
1. Ensure that the power supply is turned off. Disconnect any load.
2. Connect the program source between J2 connector terminals 6 (output voltage program input) and 5
(voltage program signal return).
3. Connect the DVM across the power supply output.
4. Turn the power supply on.
5. Apply 1% of program voltage.
6. Adjust the voltage program offset potentiometer (R472) until the DVM reads 1% of the model-rated
output voltage.
7. Apply 100% of program voltage.
8. Adjust the voltage program range potentiometer (R462) until the DVM reads the model-rated output
voltage.
Repeat this procedure until output levels are adjusted to power supply specifications (see Section 1) or to the
accuracy that your application requires.
5.3.2 Current Limit Programming Circuit Calibration
1. Ensure that the power supply is turned off. Disconnect any load.
2. Connect the program source between J2 connector terminals 8 (output current limit programming
input) and 7 (current program signal return).
3. Connect the shunt and DVM across the power supply output.
4. Turn the power supply on.
5. Apply 1% of program voltage.
6. Adjust the current limit program offset (R469) until the shunt/DVM indicates 1% of the model-rated
output current. See Note.
7. Apply 100% of program voltage.
8. Adjust the current limit program range (R459) until the shunt/DVM indicates the model-rated output
current. See Note.
Repeat this procedure until output levels are adjusted to power supply specifications (see Section 1) 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.