American-magnetics 12200PS DC Power Supply (CE-Marked) Bedienungsanleitung PDF herunterladen (Seite 56)

CALIBRATION OPERATING MANUAL

5-4 Release 1.0 (98/07)

5.4 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 0-10Vdc scales. You may need to recalibrate when you select the 0-5Vdc scale or when you switch back

to the 0-10Vdc scale after previously calibrating for 0-5Vdc operation.

See Section 5.2 to remove the cover and any option card. Follow all procedure steps in the sequence given.

5.4.1 Output Voltage Monitor Circuit Calibration

Ensure that the power supply is turned off. Disconnect any load.

Set SW1 switch 5 OPEN to select 0-5V output voltage monitor range, CLOSED for 0-10V.

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).

Turn the power supply on.

Set the power supply output voltage to 1% of the model-rated output.

Adjust the output voltage monitor offset (R397) until the monitor DVM reads 1% of the readback

scale. (50mVdc for 0-5V readback or 100mVdc for 0-10Vdc readback.)

Set the power supply output voltage to the model-rated maximum.

Adjust the output voltage monitor range (R387) until the monitor DVM reads 100% of the readback

scale.

(5Vdc for 0-5V readback or 10Vdc for 0-10Vdc 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.

5.4.2 Output Current Monitor Circuit Calibration

Ensure that the power supply is turned off. Disconnect any load.

Set SW1 switch 6 OPEN to select 0-5V output current monitor range, CLOSED for 0-10V.

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).

Turn the current control fully counter clockwise, then turn on the power supply.

Set the power supply's output current to 1% of the model-rated output. See Note.

Adjust the output current monitor offset (R394) until the monitor DVM indicates 1% of the readback

scale. (50mVdc for 0-5Vreadback or 100mVdc for 0-10Vdc readback.)

Set the power supply output current to the model-rated output.

Adjust the output current monitor range (R383) until the monitor DVM indicates 100% of the readback

scale. (5Vdc for 0-5V readback or 10Vdc for 0-10Vdc 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.

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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American-magnetics 12200PS DC Power Supply (CE-Marked) Bedienungsanleitung Seite 56