Ametek SEQUOIA Series - Page 306

Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 283
generator output. Using a differential voltage probe for isolation, connect the other input of the
phase meter to the power source output of Phase-A.
3. Enter the calibration password with the SCPI command, CAL:PASS “5000”.
4. Send the following SCPI commands to the power source (166 VAC range selected):
OUTP 0
VOLT:RANGE 166
VOLT 100
FREQ:MODE SENSE
PHASE 0
OUTP 1
5. 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 degree to
obtain a phase meter reading of a value near zero.
6. Repeat Step 4 and 5 for output frequencies of 50 Hz, 200 Hz, 550 Hz, 819 Hz, and 905 Hz (with
SCPI command, FREQ <n>), or the highest frequency of the particular power source model
being aligned.
7. 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.
9.2.20 Output Phase-A Alignment, Auxiliary Unit Relative to Master Unit (LKS Option Only)
1. Connect two power sources in a Master/Auxiliary configuration for multi-phase group. Refer to
Section 3.8.3.
2. Connect the remote voltage sense leads of the Master unit and the Auxiliary unit to their
respective output terminals.
3. Set up the phase meter to make phase measurements of the Auxiliary power supply output of
Phase-A relative to the Master power supply output of Phase-A as a reference. Using differential
voltage probes for isolation, connect one input of the phase meter to the Master unit and the
other input of the phase meter to the Auxiliary unit.
4. Send the following SCPI commands to the power sources (200 VAC range selected):
To the Auxiliary unit:
OUTP 0
VOLT:RANGE 166
VOLT 100
FREQ:MODE EXT
PHASE 0
OUTP 1
To the Master unit: