Sequoia / Tahoe Series User Manual California Instruments
272 M447352-01 REV-A
6. Perform the AC zero alignment using the SCPI command,
CAL:VOLT:LRAN:ZERO <numeric value>. The numeric value is in the range of 0 to 255; the
default value is 127. Align for the lowest AC output voltage reading of the selected phase, but at
least < 200 mV. Ensure that the DVM is at a high enough range (e.g. 10 or 20 VAC) so that
errors are not introduced from output ripple/noise components.
7. Send the SCPI command, INST:NSEL 2, and repeat Step-6 and Step-7 to align Phase-B.
8. Send the SCPI command, INST:NSEL 3, and repeat Step-6 and Step-7 to align Phase-C.
9.2.4 Output Voltage DC Zero Alignment, DC-Mode
1. With the external DVM set for DC, monitor the voltage at the power source output.
2. Ensure that there is no load connected to the output of the power source.
3. Enter the calibration password with the SCPI command, CAL:PASS “5000”.
4. Send the following SCPI command to select Phase-A:
INST:NSEL 1.
5. Send the following SCPI commands to the power source (440 VDC range selected; ALC off):
VOLT:ALC OFF
MODE DC
VOLT:RANGE 440
VOLT 0
OUTP 1
6. Perform the alignment with the SCPI command, CAL:VOLT:DC:ZERO <numeric value>. Start
with a value of zero and increase or decrease for the lowest DC output voltage reading of the
selected phase within the range of 0 5 mV DC. The maximum range of this alignment is ±2000.
7. Send the SCPI command, INST:NSEL 2, and repeat Step-5 and Step-6 to align Phase-B.
8. Send the SCPI command, INST:NSEL 3, and repeat Step-5 and Step-6 to align Phase-C.
9.2.5 Output Voltage Gain Initial Alignment, AC-Mode and DC-Mode
1. With the external DVM set for AC, monitor the voltage at the power source output.
2. Ensure that there is no load connected to the output of the power source.
3. Enter the calibration password with the SCPI command, CAL:PASS “5000”.
4. Send the following SCPI command to select Phase-A:
INST:NSEL 1
5. Voltage Gain Initial Alignment, AC-Mode: Send the following SCPI commands to the power
source (400 VAC range selected; ALC off):
VOLT:ALC OFF
MODE AC
VOLT:RANGE 333
VOLT 250
FREQ 60
OUTP 1
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