Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 287
VOLT:RANG 440
VOLT:ALC OFF
VOLT:REF RPV
INST:COUP NONE
4. Enter the calibration password with the SCPI command, CAL:PASS “5000”.
5. DC Offset alignment, high-range DC output (440 VDC):
6. Send the SCPI command, INST:NSEL 1, to select Phase-A.
7. Perform the DC offset alignment for the selected phase 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;
the query will return a 1 to indicate completion. 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. DC Gain alignment, high-range DC output (440 VDC):
11. Send the SCPI command, INST:NSEL 1, to select Phase-A.
12. Apply an external DC voltage of 10.0 VDC, ± 0.005 V.
13. Perform the output voltage DC 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 1000;
increasing the value would increase the output voltage. Turn on the output with the SCPI
command, OUTP 1. Adjust the numeric value for the closest setting producing an output voltage
of 440 VDC.
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 DC output (440 VDC):
17. Send the SCPI command, INST:NSEL 1, to select Phase-A.
18. Apply an external programming DC voltage of 10.0 VDC, ± 0.005 V.
19. Perform the ADC-RMS gain alignment with the SCPI command, CAL:MEAS:EXT:FSC 440.
Send the SCPI query command, *OPC?, to determine when this alignment step has been
completed; the query will return a 1 to indicate completion. Ensure alignment has been
completed (query returns a 1) before continuing. Verify the measurement with the SCPI
command, MEAS:VOLT:EXT?, and ensure that the returned output voltage value, 440 VDC, 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.
9.2.24 Alignment of External Programming Signal for Output Voltage Amplitude, AC 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). This signal input has a dual
function, and for this alignment is selected for amplitude programming using the SCPI command,
VOLT:REF RPV. The alignment is performed with a DC input: for example, a 0-10 VDC signal would
control the AC output voltage amplitude from zero to full-scale of the selected output voltage range, while
the AC output waveform is programmed through the internal reference generator.
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