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3. Press the front panel STANDBY switch to its IN position. Check that the output
4. While holding the front panel V/I CHECK switch in, adjust the voltage check
5. Press the STANDBY switch again to its OUT position to resume normal power
Ammeter
1. Connect the DVM across the output current shunt with the negative lead
Calibration
2. Turn on the load and adjust the load until the external DVM reads the maximum
3. Adjust the ammeter full scale adjust potentiometer (R51) until the front panel
4. While holding the front panel V/I CHECK switch in, adjust the current check
5. Turn off the load.
Over Voltage
1. Set the output voltage to the maximum rated output voltage.
Protection
2. Slowly turn the front panel OVP SET screw counter clockwise until the OVP
(OVP)
Calibration
3. Lower the output voltage setting and press the front panel STANDBY switch
4. Increase the output voltage slowly until the OVP circuit just fires. Observe the
5. Press OVP CHECK, and adjust the OVP check calibration potentiometer (R54)
6. Repeat the process to ensure that the OVP preview reading in within 1% of the
7. Turn the OVP SET screw fully clockwise.
Revision A
voltage drops to 0V in less than 2 seconds. Check that the S/D LED turns on.
calibration potentiometer (R53) until the front panel meter reads the maximum
rated output.
supply operation and to reset the output.
connected to the power supply return side of the shunt. Turn the voltage control
knob fully clockwise.
rated output voltage.
ammeter reads the maximum rated output current.
calibration potentiometer (R52) until the front panel ammeter reads the
maximum rated output current.
just fires. Check that the output voltage drops to 0V in less than 2 seconds. Check
that the front panel OVP LED is on.
twice to reset the output.
voltage reading at firing point for future reference.
to match the output voltage setting observed when the OVP circuit fired.
OVP fire point.
Calibration
Front Panel Calibration
77
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