Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 291
10. Send the following SCPI commands to the power source (333 VAC range selected; ALC ON):
OUTP 0
VOLT:ALC ON
MODE AC
VOLT:RANG 333
VOLT 333
FREQ 60
OUTP 1
11. Perform the adjustment using the command CAL:MON:VOLT:FSC <numeric value>. The
numeric value is in the range of 0 to 255. Adjust until the phase A voltage monitor output reading
is 7.07V(RMS) +/-10mV, where the output voltage is 333V.
12. Send the SCPI command, INST:NSEL 2, and repeat Step-10 and Step-11 to align Phase-B.
13. Send the SCPI command, INST:NSEL 3, and repeat Step-10 and Step-11 to align Phase-C.
9.2.27 Alignment of Output Current Monitor, DC output
The Isolated Output Current Monitor for getting the scaled down output current are available in the rear
panel external analog control signal connector: Phase-A current monitor (IMON) 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 (220 VAC range selected; ALC ON):
VOLT:ALC ON
MODE DC
VOLT:RANG 220
VOLT 100
FREQ 60
5. Ensure that the load is connected to the output of the power source and set the load resistance:
R = (100*0.90)V / FSC
6. 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.
7. Send the SCPI command, INST:NSEL 2, and repeat Step-2 through Step-6 to align Phase-B.
8. Send the SCPI command, INST:NSEL 3, and repeat Step-2 through Step-6 to align Phase-C.
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