Focus Microwaves ituner - 4.4.20 Gamma_AT? Command; 4.4.21 VSWR? Command

iTuner Manual
36
When calling while the tuner is moving, the probe position at the time of the
query is used to calculate GAMMA. Use the STATUS? Command to make sure
that the tuner has completed a ‘tuning’ movement before calling GAMMA to
obtain the actual reflection coefficient.
The query also returns the LOSS of the tuner and adapter. LOSS calculation
depends on the active tuner mode. (see above)
Examples:
Gamma?
CCMT->gamma?
1000.000MHz: Gamma: 0.8861 12.48 Loss:0.20dB
2000.000MHz: Gamma: 0.9527 163.22 Loss:1.18dB
3000.000MHz: Gamma: 0.9617 -36.28 Loss:2.58dB
4.4.20 Gamma_AT? Command
Call GAMMA? to query reflection coefficient seen by DUT for a given probe position
Syntax:
GAMMA_AT? Xpos Ypos [idx]
Parameter:
Xpos
Ypos
Idx
Horizontal position
Vertical position
Optional frequency index
Return value:
0 -> okay
<0 , no calibration loaded
Remarks:
The GAMMA_AT? Command returns the reflection coefficient seen by the device
for the given probe position, taking into account the ADAPTER and TERM
definitions.
Examples:
Gamma_AT? 500 4500
4.4.21 VSWR? Command
Call VSWR? to query VSWR currently seen by DUT
Syntax:
VSWR?
Parameter:
none
Return value:
0 -> okay