R&S ZNH, User Manual, Page: 128 / 369

Cable and Antenna Test Mode
R&S
®
ZNH
121 User Manual 1334.5985.02 ─ 02
Calibration also remains valid after turning off the R&S ZNH or changing into another
operating mode as calibration data is saved in the internal memory of the R&S ZNH. If
you save the measurement in a dataset, calibration data is part of that dataset. When
you restore the dataset and perform the same measurement again, you do not have to
recalibrate the R&S
ZNH. See Chapter 5.4, "Presetting the R&S ZNH" , on page 82.
7.1.7.1 Calibration States
The R&S ZNH features several calibration states that it displays on the cabin the status
line. The possible states depend on the calibration state (see below).
●
<no calibration label>
The R&S
ZNH does not display a calibration state when the calibration data uses
the factory calibration. The factory calibration is a "Full 2-port" calibration per-
formed in the factory during production. It is stored in the memory and can be
restored after a preset.
●
(cal)
The calibration data uses the user calibration. To get in this state, a "Full 1-port " or
"Full 2-port" calibration such as "Refl OSM", "TOSM" or "UOSM" is performed.
●
(cal int)
The calibration data uses the interpolated user calibration after a "Full 1-port " or
"Full 2-port" is performed. Interpolation is used when you change one of the fre-
quency parameters (start, stop or center frequency). In that case, the distribution of
the measurement points is different to the distribution during calibration. This could
result in an increasing measurement uncertainty.
●
(norm)
The R&S
ZNH is using normalization. To get in this state, the normalization type of
calibration is performed, such as "Refl Norm Open", "Refl Norm Short", "Refl Norm
P1", "Refl Norm P2" or "Normalization Both". For more information, see
Chap-
ter 8.1.2, "Calibration Methods" , on page 149.
●
(uncal)
No calibration is loaded. The R&S
ZNH is in this state during the calibration proc-
ess.
7.1.7.2 Calibration Methods
The following user calibration methods are available in the antenna and cable test
mode.
●
Full 2-Port ("TOSM" and "UOSM")
Both RF ports are calibrated for a complete set of measurements. The calibration
routine therefore requires the connection of the standards load, open and short to
both test ports, and a through connection of the RF ports. The influences of the test
setup and of the isolation between the RF ports are thereby determined and taken
into account in the subsequent measurement of the device under test.
While this method is the most time-consuming during calibration, it does provides
the greatest accuracy for all measurements at both test ports without recalibration
and is thus the most flexible. For more information on "TOSM" and "UOSM"),
Chapter 8.1.2, "Calibration Methods" , on page 149.
Performing Cable and Antenna Measurements