Rohde & Schwarz ZNB20, User Manual

Page: 336 / 1332

GUI Reference
R&S
®
ZNB/ZNBT
321 User Manual 1173.9163.02 ─ 38
Line Type / Rel. Permittivity εr / Cutoff Freq. fc
"Line Type" describes the wave propagation mode (offset model) in the transmission
lines of the standards associated with the connector type.
●
If the calibration kit standards contain lines with transverse electric propagation
mode (TEM, e.g. coax cables), then the "Rel. Permittivity εr" 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 Freq. fc") can be defined. The
default cutoff frequency if 0 Hz (propagation at all frequencies). No relative permit-
tivity is needed for waveguides.
Note: The impedance for waveguides is frequency-dependent. If a waveguide line type
is selected, various dialogs will indicate "varies" instead of a definite impedance value.
Impact of line type parameters
The line type parameters are used for the calculation of the S-parameters for the cali-
bration standards associated with the connector type, provided that they are derived
from a circuit model (see
"View / Modify Cal Kit Standards Dialog" on page 325).
●
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
"View / Modify Cal Kit Standards Dialog"
on page 325). The "Electrical Length" and "Delay" values in the View / Modify Cal
Kit Standards 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
, an error message is generated.
The offset model parameters are not used except in the context of calibration. The off-
set parameter definitions are based on independent ε
r
values; see Chapter 5.7.2, "Off-
set Tab" , on page 411.
Remote command:
[SENSe<Ch>:]CORRection:CONNection
Add / Delete
Adds or deletes a user-defined connector type. The parameters of a user-defined con-
nector type can be modified in the table.
Note: Deleted/Missing Connector Types.
●
Deleting a connector type will also delete all calibration or adapter kits assigned to
it.
●
Deleting a connector type that is used by a loaded recall set resets the affected
ports to the instrument's connector type and gender.
●
A setup can only be loaded if all its connector types (identified by their names) are
configured at the target instrument.
Remote command:
[SENSe<Ch>:]CORRection:CONNection
[SENSe<Ch>:]CORRection:CONNection:CATalog?
[SENSe<Ch>:]CORRection:CONNection:DELete
Cal Softtool