Rohde & Schwarz 1145.1010.04/05/06, Operating Manual

Page: 388 / 813

Channel Menu R&S
®
ZVA/ZVB/ZVT
1145.1084.12 4.226 E-6
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
r
is needed for the conversion of and ZVR-type
Loss (in units of dB/sqrt(GHz)) into an Agilent-type Offset Loss (in units of G /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
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 and error message.
The offset model parameters are not used except in the context of calibration. The offset
parameterdefinitions (see Mechanical Length) are based on independent
r
values.
Remote control: [SENSe<Ch>:]CORRection:CONNection
Add or View / Modify Standard
Defines, displays or modifies the properties of the calibration standards in a particular calibration kit.
This dialog is opened from the Add or View / Modify Calibration Kit dialog (Add Standard... or View /
Modify Standard... buttons) . Depending on the title, some control elements may not be active.
For an overview of calibration standards and their properties refer to section Calibration standard
types below.
In its upper part the Add Standard or View / Modify Standard dialog contains several controls to do the
following: