Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 275
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.
9.2.8 Output Voltage Measurement DC-Negative 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:NEG <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.
9.2.9 Output Current Measurement AC Low-Range Gain Alignment, AC-Mode
1. Connect the power analyzer for AC current measurement.
2. Connect the load to the output of the power source.
3. Set load to the low-range resistance for 90% of the rated current, appropriate for the model that
is to be aligned. Ensure that the load setting maintains the power source in the constant-voltage
(CV) mode of operation.
4. Enter the calibration password with the SCPI command, CAL:PASS “5000”.
5. Send the following SCPI command to select Phase-A:
INST:NSEL 1
6. Send the following SCPI commands to the power source (166 VAC range selected; ALC off):
OUTP 0
CURR:PROT OFF
MODE AC
VOLT:RANGE 166
VOLT 88
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