Sequoia / Tahoe Series User Manual California Instruments
278 M447352-01 REV-A
9. Send the SCPI command, INST:NSEL 2, and repeat Step-4 through Step-8 to align Phase-B.
10. Send the SCPI command, INST:NSEL 3, and repeat Step-4 through Step-8 to align Phase-C.
9.2.12 Output Current Measurement AC High-Range Offset Alignment, AC-Mode
1. Ensure that there is no load connected to the output of the power source.
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 (333 VAC range selected; ALC off):
OUTP 0
CURR:PROT OFF
MODE AC
VOLT:RANGE 333
VOLT 0
FREQ 100
VOLT:ALC OFF
OUTP 1
5. Reset the high-range offset alignment with the SCPI command, CAL:MEAS:CURR:HROF 0.
6. Measure the output current with the SCPI command, MEAS:CURR?.
7. Perform the alignment with the SCPI command, CAL:MEAS:CURR:HROF <numeric value>.
The numeric value is the output current returned by the command MEAS:CURR?. Enter
successive values from MEAS:CURR? until the alignment gives a value of ≤ 1 mA(RMS).
8. Send the SCPI query command, *OPC?, after each numeric value entry to determine when this
alignment has been completed. Ensure alignment has been completed (query returns a 1)
before continuing.
9. Send the SCPI command, INST:NSEL 2, and repeat Step-4 through Step-8 to align Phase-B.
10. Send the SCPI command, INST:NSEL 3, and repeat Step-4 through Step-8 to align Phase-C.
9.2.13 Output Current Measurement DC-Positive Low-Range Gain Alignment, DC-Mode
1. Connect the power analyzer for DC current measurement.
2. Connect the load to the output of the power supply.
3. Set load for 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 (250 VDC range selected; ALC off):
OUTP 0
CURR:PROT OFF
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