Ametek SEQUOIA Series - Page 307

Sequoia / Tahoe Series User Manual California Instruments
284 M447352-01 REV-A
OUTP 0
VOLT:RANGE 166
VOLT 100
FREQ 16
OUTP 1
5. To the Auxiliary unit, enter the calibration password with the SCPI command, CAL:PASS “5000”.
6. Perform the alignment with the SCPI command, CAL:PHASE <numeric value>, where the
numeric value is derived from phase measurement using the phase meter. Initially, set the phase
to zero with the SCPI command, CAL:PHASE 0. Record the phase angle reading from the phase
meter, Reprogram the calibration phase with the same value obtain from the phase meter with
the command CAL:PHASE < numeric value >. You may have to add or subtract 0.2 degrees to
obtain a phase meter reading of a value near zero.
7. Repeat Step-4 through Step-6 for output frequencies in the leader unit of 50 Hz, 100 Hz, 200 Hz,
819 Hz, and 905 Hz (with SCPI command, FREQ <n>), or the highest frequency of the particular
power source model being aligned.
8. The calibration coefficients could be verified with the SCPI query, CAL:PHASE?. First cycle the
AC input power off then on, and then send the command, CAL:PHASE?. The command will
return a command-separated number sequence of calibration coefficients with the following
format: f1,data1,f2,data2,f3,data3,f4,data4,f5,data5,f6,data6,current-cal.
9.2.21 Output Phase-B and Phase-C Alignment Relative to Phase-A
1. Set up the phase meter to make phase measurements of the power supply output of
Phase-B relative to the power supply output of Phase-A as a reference. Using differential voltage
probes for isolation, connect one input of the phase meter to Phase-B and the other input of the
phase meter to Phase-A.
2. Send the following SCPI commands to the power source (200 VAC range selected):
INST:COUP ALL
OUTP 0
VOLT:RANGE 200
VOLT 100
FREQ:MODE INT
FREQ 16
OUTP 1
INST:COUP NONE
3. Enter the calibration password with the SCPI command, CAL:PASS “5000”.
4. Send the following SCPI commands to select Phase-A and set the phase to zero:
INST:NSEL 1
CAL:PHASE 0
5. Send the SCPI command, INST:NSEL 2, to select Phase-B.
6. Perform the alignment with the SCPI command, CAL:PHASE <numeric value>, where the numeric
value is derived from phase measurement using the phase meter. Initially, set the phase to zero
with the SCPI command, CAL:PHASE 0. Record the phase angle reading from the phase meter,