Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 271
CAUTION!
The AC input power must be cycled off and then on when calibration has been
completed to terminate the alignment routines and have calibration take effect. This
is necessary also if only subsections of the calibration procedure are performed.
9.2.2 Output Voltage DC Zero Alignment, AC-Mode
1. Cycle the AC input power to the unit off and then on.
2. With the external DVM set for DC, monitor the voltage at the power source output.
3. Ensure that there is no load connected to the output of the power source.
4. Enter the calibration password with the SCPI command, CAL:PASS “5000”.
5. Send the following SCPI command to select Phase-A:
INST:NSEL 1
6. Send the following SCPI commands to the power source; the ALC could be either off (333 VAC
range selected):
VOLT:RANGE 333
MODE AC
FREQ 60
VOLT 0
OUTP 1
7. Perform the AC zero alignment using the SCPI command,
CAL:VOLT:AC:LRAN:ZERO <numeric value>. The numeric value is in the range of 0 to 2000;
the default value is 127. Align for the lowest AC output voltage reading of the selected phase,
but at least < 20 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.
8. Send the SCPI command, INST:NSEL 2, and repeat Step-6 and Step-7 to align Phase-B.
9. Send the SCPI command, INST:NSEL 3, and repeat Step-6 and Step-7 to align Phase-C.
9.2.3 Output Voltage AC Zero Alignment, AC-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. Send the following SCPI commands to the power source; the ALC could be either on or off
(333 VAC range selected):
VOLT:RANGE 333
MODE AC
FREQ 60
VOLT 0
OUTP 1
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