AMETEK Compact i/iX Series - Manual (Page 99)

User Manual Compact i/iX Series
AMETEK Programmable Power California Instruments 99
6.5 Non-Routine Output Offset and Gain Calibration
WARNING: This requires the top cover to be removed and should be done by qualified service
personnel only. Dangerous Voltages are present inside the AC power source.
First adjust amplifier DC offset as follows:
1. Turn on the front panel power switch.
2. Program the ALC mode to OFF, output mode to DC function, select Low Voltage range and
program 0.0 volts.
3. Use a 100K resistor in series with a 10 uF cap and connect this series network across the
output terminals. Connect an external DVM across the cap. Program the DVM to DC.
4. Close the power source output relay and adjust R70 on the Controller (A4) for zero ±5 mV.
See Figure 6-1 for pot location on the controller board.
5. Remove the series resistor and cap.
To adjust amplifier output gain, proceed as follows:
1. Connect the DVM directly to the output terminals.
2. Program the AC function, Hi range, 240V and 60 Hz. Go to the OUTP CAL screen and adjust
the VOLT FS value for an output of 240 ±1 VAC.
3. Program 10.0 volts AC. Adjust R140 on the controller (A4) for an output of 10 ± 0.2 VAC. See
Figure 6-1 for pot location on the controller board.
4. Program 240 VAC and 500 Hz. Check the output is 240 ± 5 VAC. If the output is not correct it
indicates an amplifier gain problem.