Rohde & Schwarz ZNB20, User Manual

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Command Reference
R&S
®
ZNB/ZNBT
988 User Manual 1173.9163.02 ─ 38
<DelayTimePhase> Optional entry of delay time or phase for UTHRough standard:
AUTO - the analyzer determines the delay time or phase during
the calibration sweep.
<delay or phase> - entry of the delay time in ps (for non-disper-
sive standards) or of the phase at the start frequency of the
sweep in deg (for dispersive standards). If an estimate of the
start phase is entered, the analyzer uses the
calculated value
which is closest to the estimate.
Automatic determination of the phase
The UOSM algorithm provides the transmission factor of the
unknown through standard up to an ambiguous sign. This yields
the two alternative phase values displayed in the calibration wiz-
ard; see Unknown Through Standard.
In remote control, the analyzer performs a plausibility check in
order to determine the correct phase. No manual selection is
necessary. The check starts at the first sweep point, using the
transmission factor with negative phase. The analyzer measures
the phase at the subsequent sweep points, assuming that the
phase difference between any two consecutive points is less
than 90 deg. From these phase values, the analyzer calculates a
linear extrapolation and derives an estimate for the DC phase
limit. If this DC phase is in the vicinity of ... -180 deg, +180
deg, ... then the transmission factor with negative phase is adop-
ted. If the DC phase is in the vicinity of ... 0 deg, +360 deg, ...
then the transmission factor with inverted sign (corresponding to
a 180 deg phase shift) is adopted.
*RST:
AUTO
Example: See
[SENSe<Ch>:]CORRection:COLLect:SAVE:
SELected[:DUMMy]
or Chapter 8.2.5.4, "Adapter Removal" ,
on page 1239
Usage: Setting only
Manual operation: See "Start Cal Sweep" on page 282
[SENSe<Ch>:]CORRection:COLLect:AUTO <Characterization>, <TestPort>,
<TestPort>...
Selects and initiates an automatic calibration for the specified test ports using a single,
auto-detected port assignment.
Tip:
●
If the test setup contains a high attenuation, the analyzer may fail to detect the cal
unit ports connected to each of its ports. In this case use the extended command
[SENSe<Ch>:]CORRection:COLLect:AUTO:PORTs
.
●
Use
[SENSe<Ch>:]CORRection:COLLect:AUTO:TYPE
if you want to specify a
particular calibration type for the automatic calibration.
●
If several calibration units are connected, use
SYSTem:COMMunicate:RDEVice:
AKAL:ADDRess
to select a unit for the calibration.
SCPI Command Reference