Sequoia / Tahoe Series User Manual California Instruments
292 M447352-01 REV-A
9.2.28 Alignment of Output Current Monitor, AC output
The Isolated Output Current Monitor for getting the scaled-down output current is available in the rear
panel external analog control signal connector: Phase-A current monitor signal output will be obtained at
Pin-6; Phase-B current monitor signal input at Pin-7; Phase-C current signal input at Pin-8; signal return
at Pin-9 (refer to Section 3.8.4). The alignment is performed for 0V to full-scale output current for 0-
7.07V(RMS) monitor signal range.
1. With the external DVM set for AC, monitor the output current monitor (IMON) signal at the
external analog control signal connector pin (Pin- 6 for Phase A, Pin-7 for Phase B, and Pin 8 for
Phase C) with respect to Pin- 9.
2. Enter the calibration password with the SCPI command, CAL:PASS “5000”.
3. Send the following SCPI command to select Phase-A:
INST:NSEL 1
4. Send the following SCPI commands to the power source (166 VAC range selected; ALC ON):
VOLT:ALC ON
MODE AC
VOLT:RANG 166
VOLT 166
FREQ 60
9. Ensure that the load is connected to the output of the power source and set the load resistance:
R = (100*0.90)V / FSC
5. Enable output OUTP 1. Perform the adjustment using the command CAL:MON:CURR:FSC
<numeric value>. The numeric value is in the range of 0 to 255. The default value is 127. Adjust
until the phase A current monitor output reading to 7.07V(RMS) +/- 10mV, where the output
current is full-scale current.
6. Send the SCPI command, INST:NSEL 2, and repeat Step-2 through Step-6 to align Phase-B.
7. Send the SCPI command, INST:NSEL 3, and repeat Step-2 through Step-6 to align Phase-C.
8. Cycle the AC input power off and then on when calibration has been completed to terminate the
alignment routines and have the calibration take effect.
9.3 E-LOAD Mode Calibration Procedures
9.3.1 Preparation for Calibration
WARNING!
Hazardous voltages exist at the rear of the power source. Care must be
taken to avoid contact with the AC input and AC/DC output terminals.
Only authorized personnel should perform these procedures.
Only technically trained personnel, who understand the operation of the power source, and are capable
of taking accurate readings and following the procedure steps, should perform calibration. The calibration
procedures require precision instrumentation to measure voltage and current; when substituting for the
recommended test equipment, ensure that the accuracy is adequate so that excessive error is not
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