Sequoia / Tahoe Series User Manual California Instruments
274 M447352-01 REV-A
9.2.6 Output Voltage Measurement AC Gain Alignment, AC-Mode
1. With the external DVM set for AC, monitor the voltage at the power source output.
2. Ensure that there is no load connected to the output of the power source.
3. Enter the calibration password with the SCPI command, CAL:PASS “5000”.
4. Send the following SCPI command to select Phase-A:
INST:NSEL 1
5. Send the following SCPI commands to the power source (400 VAC range selected; ALC off):
VOLT:ALC OFF
MODE AC
VOLT:RANG 333
VOLT 250
FREQ 60
OUTP 1
6. Perform the alignment with the SCPI command, CAL:MEAS:VOLT <numeric value>. The
numeric value for the selected phase is the actual output reading from the external DVM
connected to the power source output.
7. Send the SCPI query command, *OPC?, to determine when this alignment section has been
completed. Ensure alignment has been completed (query returns a 1) before continuing.
8. Send the SCPI command, INST:NSEL 2, and repeat Step-5 through Step-7 to align Phase-B.
9. Send the SCPI command, INST:NSEL 3, and repeat Step-5 through Step-7 to align Phase-C.
9.2.7 Output Voltage Measurement DC-Positive Gain Alignment, DC-Mode
1. With the external DVM set for DC, monitor the voltage at the power source output.
2. Ensure that there is no load connected to the output of the power source.
3. Enter the calibration password with the SCPI command, CAL:PASS “5000”.
4. Send the following SCPI command to select Phase-A:
INST:NSEL 1
5. Send the following SCPI commands to the power source (500 VDC selected; ALC off):
OUTP 0
VOLT:ALC OFF
MODE DC
VOLT:RANG 440
VOLT 350
OUTP 1
6. Perform the alignment with the command CAL:MEAS:VOLT:DC <numeric value>. The numeric
value for the selected phase is the actual output reading from the external DVM connected to the
power source output.
7. Send the SCPI query command, *OPC?, to determine when this alignment section has been
completed. Ensure alignment has been completed (query returns a 1) before continuing.
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