Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 289
20. Send the SCPI command, INST:NSEL 2, and repeat Step-19 and Step-20 to align Phase-B.
21. Send the SCPI command, INST:NSEL 3, and repeat Step-19 and Step-20 to align Phase-C.
9.2.25 Alignment of Output Voltage Monitor, DC output
The Isolated Output Voltage Monitor for getting the scaled-down output voltage is available in the rear
panel external analog control signal connector: Phase-A Voltage monitor (VMON) signal output will be
obtained at Pin-11; Phase-B monitor signal input at Pin-12; Phase-C signal input at Pin-13; signal return
at Pin-14 (refer to Section 3.8.4). The alignment is performed for 0V to full-scale output voltage (220 volts
or 440 volts in DC) for a 0-7.07V(RMS) monitor signal range.
1. Ensure that there is no load connected to the output of the power source.
1. With the external DVM set for AC, monitor the output voltage monitor (VMON) signal at the
external analog control signal connector pin (Pin-11 for Phase A, Pin-12 for Phase B and Pin 13
for Phase C) with respect to Pin-14.
2. Enter the calibration password with the SCPI command, CAL:PASS “5000”.
3. Send the following SCPI command to select Phase-A:
INST:NSEL 1
4. Send the following SCPI commands to the power source (220 VAC range selected; ALC OFF):
VOLT:ALC OFF
MODE AC
VOLT:RANG 220
VOLT 0
FREQ 60
OUTP 1
5. Perform the adjustment using the command CAL:MON:VOLT:ZERO <numeric value>. The
numeric value is in the range of 0 to 255. Adjust until the phase A voltage monitor output reading
is 0V(RMS) +/-5mV, where the output voltage is 0V.
6. Send the SCPI command, INST:NSEL 2, and repeat Step-2 through Step-6 to align Phase-B.
7. Send the SCPI command, INST:NSEL 3, and repeat Step-2 through Step-6 to align Phase-C.
8. Send the following SCPI command to select Phase-A:
INST:NSEL 1
9. Send the following SCPI commands to the power source (220 VAC range selected; ALC ON):
VOLT 220
10. Perform the adjustment using the command CAL:MON:VOLT:FSC <numeric value>. The
numeric value is in the range of 0 to 255. Adjust until the phase A voltage monitor output reading
is 7.07V(RMS) +/-10mV, where the output voltage is 220V.
11. Send the SCPI command, INST:NSEL 2, and repeat Step-10 and Step-11 to align Phase-B.
12. Send the SCPI command, INST:NSEL 3, and repeat Step-10 and Step-11 to align Phase-C.
13. Send the following SCPI command to select Phase-A:
INST:NSEL 1
14. Send the following SCPI commands to the power source (440 VAC range selected; ALC ON):
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