Sequoia / Tahoe Series User Manual California Instruments
298 M447352-01 REV-A
12. Set Voltage Source (connected at Sequoia unit load side) Mode DC, voltage to 200V, and
current limit Max (should be greater than the Sequoia unit 80% of the DC Low range rated
current).
13. Send the following commands, which also change the voltage mode to DC:
OUTP 0
MODE DC
VOLT:RANGE 220
SYNC:VOLT 200
CURR <80% of the rated current>
14. Perform the synchronization procedure section 9.3.3 and enable the output of Sequoia unit using
command OUTP 1.
15. Send the following SCPI command to select Phase-A:
INST:NSEL 1
16. Verify the existing calibration coefficient by CAL:CURR:DC?.
17. Perform the alignment by adjusting the output current of the selected phase to 80% of the rated
current ±0.2% FSC as indicated on the Power Analyzer by using the SCPI command,
CAL:CURR:DC <numeric value> to increase or decrease the value.
18. Send the SCPI command, INST:NSEL 2, and repeat Step-16 and Step-17 to align Phase-B.
19. Send the SCPI command, INST:NSEL 3, and repeat Step-16 and Step-17 to align Phase-C.
9.3.8 Phase Shift calibration
1. Set Voltage Source (connected at Sequoia unit load side) Mode AC, voltage to 150V, frequency
50Hz, and current maximum limit (should be greater than the Sequoia unit).
2. Send the following SCPI commands to the power source (200 VAC range selected):
CURR:ALC OFF
MODE AC
VOLT:RANGE 166
SYNC:VOLT 150
SYNC:FREQ 50
CURR:PHASE 30
3. Perform the synchronization procedure section 9.3.2 and enable the output of Sequoia unit using
command OUTP 1.
4. Set the current to 50% of rated current by sending the command CURR <50% of rated current>.
5. Enter the calibration password with the SCPI command, CAL:PASS “5000”.
6. Send the following SCPI commands to select Phase-A:
INST:NSEL 1
7. Perform the alignment with the SCPI command, CAL:PHASE <numeric value>, where the
numeric value is derived from phase measurement using the Power Analyzer. You may have to
add or subtract 0.2 degrees to obtain a phase measurement reading of a value near zero.
8. Send the SCPI command, INST:NSEL 2, and repeat Step-7 to align Phase-B.
To Next Page
Loading...
