AMETEK BPS Series Programming Manual - Manual (Page 46)

AMETEK Programmable Power BPS / MX / RS Series SCPI Programming Manual
46 Manual P/N 7003-961 Rev AA
4.2.5 Output Phase
CALibrate:PHASe
The MX/RS Series AC/DC power source controller can be operated using its internal
timebase reference, an external clock or in external sync mode. (See FREQ:MODE
command on page 81. When using in external clock or sync mode, it may be desirable to
shift the phase output with respect to the external reference. The feature may be used to
create a deliberate phase offset or to compensate for phase delays that may occur in the
external sync signal path. The phase calibration command can be used to program a
negative or positive phase offset for phase in degrees with respect to the external sync. Note
that this calibration adjustment only applies to the external clock or sync for phase A. Phase
B and C are always programmed with respect to phase A and their calibration offset is with
respect to phase A. The phase to be calibrated can be selected using the INST:NSEL
command.
The phase offset is expressed in degrees and can range from -360.0 to +360.0 degrees.
The resolution of the phase angle adjustment (0.1°) is the same as the one for programming
phase angles (See [SOURce:]PHASe command).
Command Syntax CALibrate:PHASe
Parameters (a value between -360.0 and +360.0)
Examples CAL:PHAS -2.3
Query Syntax CAL:PHAS?
Returned Parameters (value range -180.0 to +180.0)
Related Commands FREQ:MODE [SOURce:]PHASe INST:NSEL
4.2.6 Output Calibration Command Sequence
Note that the ALC mode normally interferes with the full scale output voltage calibration. As such, to
perform full scale output voltage calibration over the bus, the ALC mode must be off. This is done
automatically by sending the CAL:PASS command. However, to use the ALC mode to obtain the
correct output voltage, it must be on while the outputs are set. The specific sequence that has to be
followed is shown below:
CAL:PASS "nnnnn" /* Turns the calibration mode on.
INST:COUP ALL /* Couples all phases in three mode. (Not needed in 1
phase mode)
VOLT nnn /* Set desired calibration voltage level. See user manual.
FREQ nn /* Set desired calibration frequency. See user manual.
ALC ON /* Enable ALC to adjust output based on measurement
data. Note that the voltage measurement calibration must
be done first.
CAL:PASS "nnnnn" /* Cal mode has been disabled by ALC ON command so it
must be turned on again.
INST:NSEL 1 /* Select phase A. (Not needed for single phase mode).
CAL:VOLT:AC:LRAN nnn
CAL:VOLT:AC:LRAN? /* Optional. Returns coefficient between 0.9 and 1.1
/* Repeat last three commands for phase B and C using
INST:NSEL 2 and INST:NSEL 3 respectively.
CAL:SAVE /* Saves coeffient
This procedure applies to both AC and DC modes and high and low voltage ranges.