Sequoia / Tahoe Series User Manual California Instruments
300 M447352-01 REV-A
13. Send the SCPI command, INST:NSEL 1, to select Phase-A.
14. Apply an external DC voltage of 10.0 VDC, ± 0.005 V.
15. Measure the output current of Phase A with an external meter (Power Analyzer), and verify the
measured output current is 100% of full-scale current ±2% FSC.
16. If not Send the command CAL:SOUR:EXT:FSC < numerical value> . to adjust the output current
by reducing or increasing the numerical value. (Where numeric value can be up to 0 to 4095).
17. Send the SCPI command, INST:NSEL 2, and repeat Step-14 to Step-16 to align Phase-B.
18. Send the SCPI command, INST:NSEL 3, and repeat Step-14 to Step-16 to align Phase-C.
19. ADC-RMS Full-Scale alignment, high-range DC output (220 VDC):
20. Send the SCPI command, INST:NSEL 1, to select Phase-A.
21. Apply an external programming DC voltage of 10.0 VDC, ± 0.005 V.
22. Perform the ADC RMS gain alignment with the SCPI command, CAL:MEAS:EXT:FSC <100% of
Full-Scale Current>. 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:CURR:EXT?, and ensure that the returned output current is 100% of full-scale
current ±1A.
23. Send the SCPI command, INST:NSEL 2, and repeat Step-21 and Step-22 to align Phase-B.
24. Send the SCPI command, INST:NSEL 3, and repeat Step-21 and Step-22 to align Phase-C.
9.3.10 Alignment of External Programming Signal for Output Current Amplitude, AC output
The external analog programming signals for setting the output current (RPV) are available in the External
Input/Output Control 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). The alignment is performed with a DC
input: for example, a 0-10 VDC signal would produce a DC output current that would vary from zero to full-
scale current 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 External Input/Output Control connector Pin-1/Pin-2/Pin-3
(signal) and Pin-4 (signal return (refer to Section 3.8.4).
3. Set Voltage Source (connected at SQ unit load side) Mode AC, voltage to 150V, frequency
50Hz, and current maximum limit (should be greater than the SQ unit).
4. Send the following SCPI commands to the power source (166 VAC range selected; ALC off; do
not turn on the output at this time):
INST:COUP ALL
OUTP 0
MODE AC
CURR:ALC OFF
VOLT:RANG 166
SYNC:VOLT 150
SYNC:FREQ 60
CURR:PHASE 0
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