iTuner Manual
40
A complete 360
o
phase sweep can be executed without having to perform a time
consuming ‘return to horizontal zero’ operation during the test that may be required
when the tuner reaches its physical limit or enters a non-calibrated section of its
horizontal axis.
The following summarizes the available VSWR based commands and their operation:
Note: Calibration data must have been previously loaded with the LOADCAL (or LOADFREQ)
command prior to executing the commands below.
4.5.1
VSWR_AUTO command
Syntax:
VSWR_AUTO vswr [ FWD | REV | OPT ]
Parameter:
Vswr
mode
Desired VSWR value
Use one of the three possible options: (REV2.0.32)
FWD -> initialize on DUT side of tuner [default]
REV -> initialize on opposite side of tuner
OPT -> initialize on side closest to current carriage position
Return value:
Remarks:
Initializes horizontal axis to zero, adjust vertical axis to obtain the VSWR specified
(by ‘mag’) in DUT reference plane, and then performs a full 360
o
phase sweep
with maximum horizontal motor speed while continuously adjusting vertical
position to keep VSWR constant. Initializes all axis after phase sweep
Examples:
4.5.2
VSWR_INIT command
Syntax:
VSWR_INIT vswr [ FWD | REV | OPT ]
Parameter:
Vswr
mode
Desired VSWR value
Use one of the three possible options: (REV2.0.32)
FWD -> initialize on DUT side of tuner [default]
REV -> initialize on opposite side of tuner
OPT -> initialize on side closest to current carriage position
Return value:
Remarks:
Initializes horizontal axis to zero, adjust vertical axis to obtain VSWR specified (by
‘mag’) in DUT reference plane
Examples:
