AMETEK XHR 1000 Watt Series - Manual (Page 77)

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