Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 279
MODE DC
VOLT:RANGE 250
VOLT 110
VOLT:ALC OFF
OUTP 1
7. Set the output current of the power source to the low range and 90% of the rated current,
appropriate for the model that is to be aligned, using the SCPI command, CURR < 90% of the
rated current>.
8. Perform the alignment with the SCPI command, CAL:MEAS:CURR:DC <numeric value>. The
numeric value for the selected phase is the actual output current derived from the reading of the
external power analyzer.
9. 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.
10. Send the SCPI command, INST:NSEL 2, and repeat Step-6 through Step-9 to align Phase-B.
11. Send the SCPI command, INST:NSEL 3, and repeat Step-6 through Step-9 to align Phase-C.
12. The DC-positive calibration coefficients could be queried using the SCPI command,
CAL:MEAS:CURR:DC?; the command will return a comma-separated number sequence, with
the low-range coefficient followed by the high-range coefficient.
9.2.14 Output Current Measurement DC-Positive High-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 high-range resistance for 90% of the rated current appropriate for the particular
model that is to be aligned.
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 (440 VDC range selected; ALC off):
OUTP 0
CURR:PROT OFF
MODE DC
VOLT:RANGE 440
VOLT 220
VOLT:ALC OFF
OUTP 1
7. Set the output current of the power supply to the high-range and 90% of the rated current,
appropriate for the model that is to be aligned, using the SCPI command, CURR <90% of the
rated current>.
8. Perform the alignment with the SCPI command, CAL:MEAS:CURR:DC <numeric value>. The
numeric value for the selected phase is the actual output current derived from the reading of the
external power analyzer.
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