R&S ZVL
GUI Reference
Trace Menu
Operating Manual 1303.6580.32-06
138
Inverted Smith
. Moreover, the sweep type must be a
frequency sweep.
Definition of phase parameters
The phase parameters are obtained from an approximation to the derivative of the phase with respect to
frequency in the selected evaluation range.
•
Delay
is the phase delay, which is an approximation to the group delay and calculated as follows:
,
where
Q
f is the width of the evaluation range and
is the corresponding phase change. See
also note on transmission and reflection parameters below.
•
EL
is the electrical length, which is product of the phase delay times the speed of light in the
vacuum.
If no dispersion occurs the phase delay is equal to the group delay. For more information see
mathematical relations.
If a dispersive connector type (i.e. a waveguide; see
Offset Model
dialog) is assigned to a test port related
to a particular quantity, then the dispersion effects of the connector are taken into account for the
calculation of the phase delay and the electrical length.
To account for the propagation in both directions, the delay and the electrical length of a reflection
parameter is only half the delay and the electrical length of a transmission parameter. The formula
for PD above is for transmission parameters. See also introduction to section Channel – Offset.
The phase parameters are available only if the evaluation range contains at least 3 measurement
points.
The phase evaluation can cause misleading results if the evaluation range contains a 360 deg phase
jump. The trace format
Unwrapped Phase
avoids this behavior.
Remote control:
CALCulate<Chn>:STATistics[:STATe]
CALCulate<Chn>:STATistics:RESult? ELENgth | PDELay
CALCulate<Chn>:STATistics:EPDelay[:STATe]
Eval Range
Opens a dialog to define the range for the statistical and phase evaluation. The evaluation range is a
continuous interval of the sweep variable.
