Sequoia / Tahoe Series User Manual California Instruments
286 M447352-01 REV-A
7. Perform the DC offset alignment with the SCPI command, CAL:MEAS:EXT:OFFS:DC 0, with the
output off and the external analog input at 0 VDC. Send the SCPI query command, *OPC?, to
determine when this alignment step 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-7 to align Phase-B.
9. Send the SCPI command, INST:NSEL 3, and repeat Step-7 to align Phase-C
10. Output Voltage AC Gain alignment, high-range AC output (333 VAC):
11. Send the SCPI command, INST:NSEL 1, to select Phase-A.
12. Apply an external sine wave AC voltage of 10.000 V(PK), ±0.005 V at 60 Hz.
13. Perform the output voltage AC gain alignment with the SCPI command, CAL:SOUR:EXT:FSC
<numeric value>. The numeric value is in the range of 0 to 4095. Start with a value of 1500;
increasing the value would increase the output voltage. Turn on the output with the SCPI
command, OUTP 1. Adjust the numeric value with SCPI command, CAL:SOUR:EXT:FSC
<numeric value>, for the closest setting producing an output voltage of 333 V(RMS).
14. Send the SCPI command, INST:NSEL 2, and repeat Step-12 and Step-13 to align Phase-B.
15. Send the SCPI command, INST:NSEL 3, and repeat Step-12 and Step-13 to align Phase-C.
16. ADC-RMS Full-Scale alignment, high-range AC output (333 VAC):
17. Send the SCPI command, INST:NSEL 1, to select Phase-A.
18. Apply an external programming sine wave AC voltage of 10.000 V(PK), ± 0.005 V at 60 Hz.
19. Perform the ADC-RMS gain alignment with the SCPI command, CAL:MEAS:EXT:FSC 333.
Send the SCPI query command, *OPC?, to determine when this alignment step has been
completed. Ensure alignment has been completed (query returns a 1) before continuing. Verify
the ADC-RMS measurement with the SCPI command, MEAS:VOLT:EXT?, and ensure that the
returned output voltage value, 333 V(RMS), is within specification limits.
20. Send the SCPI command, INST:NSEL 2, and repeat Step-18 and Step-19 to align Phase-B.
21. Send the SCPI command, INST:NSEL 3, and repeat Step-18 and Step-19 to align Phase-C
9.2.23 Alignment of External Programming Signal for Output Voltage Amplitude, DC Output
The external analog programming signals for setting the output voltage amplitude (RPV) are available in
the External Analog Control signal connector: Phase-A signal input at Pin-1; Phase-B signal input at Pin-2;
Phase-C signal input at Pin-3; signal return at Pin-4 (refer to Section 3.8.4). These signal inputs have a
dual function, and for this alignment is selected for amplitude programming (RPV) using the SCPI
command, VOLT:REF RPV. The alignment is performed with a DC input: for example, a 0-10 VDC signal
would produce a DC output voltage that would vary from zero to full-scale of the selected output voltage
range.
1. Connect the signal inputs for Phase-A (Pin-1), Phase-B (Pin-2), and Phase-C (Pin-3) together for
connection to the same function generator output in Step-2.
2. Connect a DC reference voltage to the External Analog Control signal connector in-1/Pin-2/Pin-3
(signal) and Pin-4 (signal return); refer to Section 3.8.4.
3. Send the following SCPI commands to the power source (440 VDC range selected; ALC is off;
do not turn on the output at this time):
INST:COUP ALL
OUTP 0
MODE DC
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