Rohde & Schwarz ZVL series - Page 243

R&S ZVL GUI Reference
Channel Menu
Operating Manual 1303.6580.32-06
228
To account for the propagation in both directions, the phase shift of a reflection parameter due
to a given length offset is twice the phase shift of a transmission parameter. If, at a frequency of
300 MHz, the electrical length is increased by 250 mm (d/4), then the phase of S
21
increases by 90
deg, whereas the phase of S
11
increases by 180 deg. Equivalent relations hold for the loss.
If the trace is displayed in Delay format, changing the offset parameters simply shifts the whole
trace in vertical direction. The sign of the phase shift is determined as follows:
• A positive offset parameter causes a positive phase shift of the measured parameter and
therefore reduces the calculated group delay.
• A negative offset parameter causes a negative phase shift of the measured parameter and
therefore increases the calculated group delay.
The offset parameters can be defined separately for each port.
• Reset Lengths restores the default values for all length offsets, i.e. it resets all values to zero. The
(de-)embedding parameters are left unchanged.
• Electrical Length defines electrical length offsets and loss parameters at all test ports.
• Mechanical Length defines mechanical length offsets and loss parameters at all test ports.
• Delay defines delay times and loss parameters at all test ports.
• Auto Length determines a length offset for the receiving port of the active measured quantity with
the condition that the residual group delay of the active trace is minimized.
• Auto Offset determines a length offset an loss for the receiving port of the active measured
quantity with the condition that the residual group delay of the active trace is minimized and the
measured loss is minimized as far as possible across the entire sweep range.
• De-Embedding and Embedding open configuration dialogs for (de-)embedding transformation
networks.
The Zero Delay at Marker function overwrites the Offset parameters.
Remote control
(for Reset
Offsets):
[SENSe<Ch>:]CORRection:OFFSet<port_no>[:STATe] <numeric
_value>
Electrical Length
Opens a dialog to define the length offset parameters for the physical test ports as electrical lengths. The
dialog also contains the DC loss, the loss at the reference frequency Loss(f
ref
); and the reference
frequency f
ref
; see Loss parameters: Definition above.