Rohde & Schwarz R&S ZVA 8 - Page 391

R&S
®
ZVA/ZVB/ZVT Channel Menu
1145.1084.12 4.229 E-6
The default delay is 0 s, the default step width is 1 ns, corresponding to a step width of 299.792
mm for the electrical length. The relations hold for one-port and 2-port standards.
• Z
0
is the Characteristic Impedance of thestandard. If the standard is terminated with Z
0
, then its
input impedance is also equal to Z
0
. Z
0
is not necessarily equal to the reference impedance of
the system (depending on the Connector Type) or the terminal impedance of the standard. The
characteristic impedance of the standard is only used in the context of calibration.
The default characteristic impedance is equal to the reference impedance of the system.
• The Loss is the energy loss along the transmission line due to the skin effect. For resistive lines
and at RF frequencies the loss is approximately proportional to the square root of the
frequency.
In Agilent mode the Offset Loss is expressed in units of /s at a frequency of 1 GHz. The
following formula holds:
To determine an offset loss value experimentally, measure the delay in seconds and the loss in
dB at 1 GHz and use the formula above.
The default Loss or Offset Loss is zero.
The impedance for waveguides is frequency-dependent. If a waveguide line type is selected in
the Offset Model dialog, the Char. Impedance field is disabled and indicates "varies" instead of a
definite impedance value. Moreover no Loss or Offset Loss can be set.
Offset parameters and standard types
Offset parameters are used to describe all types of standards except the Sliding Match and the
Attenuation.
• The Sliding Match is a one-port standard with variable load parameters (sliding load) and
unspecified length. The reference impedance is fixed and equal to the characteristic impedance
of the connector type. No load and offset parameters need to be set.
• The Attenuation is a two-port standard which is fully matched in both directions (the reflection
factor at both ports is zero). No load and offset parameters need to be set.
Remote control:
[SENSe<Ch>:]CORRection:CKIT:<conn_type>:<std_type>
Modify Load
Specifies the load parameters for a particular calibration standard describing its terminal impedance.
This dialog is opened from the Add or View / Modify Standard... dialog (Modify Load... button).