R&S ZVB - Page 483

R&S
®
ZVA / R&S
®
ZVB / R&S
®
ZVT GUI Reference
Channel Menu
Operating Manual 1145.1084.12 – 30 468
assigned to the connector type.
Remote control:
[SENSe<Ch>:]CORRection:CONNection
[SENSe<Ch>:]CORRection:CONNection:DELete
Offset Model of <Standard>
Defines the wave propagation mode in the lines of the standards associated with the connector type. This
dialog is opened from the Available Connector Types dialog ( button in the table).
The Parameters to be selected depend on the Line Type:
 If the calibration kit standards contain lines with transverse electric propagation mode (TEM), then
the Relative Permittivity ε
r
of the dielectric can be defined. The default permittivity is the value for
air. TEM-type lines have no cutoff frequency.
 If the calibration kit standards contain waveguides, then the lowest frequency where a wave
propagation is possible (Cutoff Frequency f
c
) can be defined. The default cutoff frequency if 0 Hz
(propagation at all frequencies). No relative permittivity is needed for waveguides.
The impedance for waveguides is frequency-dependent. If a waveguide line type is selected, various
dialogs (e.g. Add Standard...) will indicate varies instead of a definite impedance value.
Impact of offset model parameters
The offset model parameters are used for the calculation of the S-parameters for the calibration standards
associated with the connector type, provided that they are derived from a circuit model (Add/Modify
Standard dialog).
 For TEM-type lines, the relative permittivity ε
r
is needed for the conversion of a ZVR-type Loss (in
units of dB/sqrt(GHz)) into an Agilent-type Offset Loss (in units of GΩ/s) and vice versa (see
Offset and Load parameters). The Electrical Length and Delay values in the Modify Offset dialog
are directly entered and therefore independent of ε
r
.
 For waveguides, the low frequency cutoff frequency f
c
is important because no wave propagation
is possible at frequencies below f
c
. If a standard is measured in order to acquire calibration data,
the analyzer checks the low frequency cutoff. If the start frequency of the sweep range is below f
c
, then the calibration wizard generates an error message.
The offset model parameters are not used except in the context of calibration. The offset parameter
definitions (see Mechanical Length) are based on independent ε
r
values.
Remote control:
[SENSe<Ch>:]CORRection:CONNection