GUI Reference
R&S
®
ZNC
167
User Manual 1173.9557.02 ─ 13
wave quantities is 1 Volt. The RMS value has zero phase. The selected trace format is
applied to the unformatted RMS value, which means that the RMS result of a trace does
depend on the trace format.
Remote command:
Phase / El Length
Displays or hides the phase delay ("Delay") and the electrical length ("EL") of the trace
in the selected evaluation range ("Eval Range..."). The parameters are only available for
trace formats that contain phase information, i.e. for the formats "Phase, Unwrapped
Phase", and the polar diagram formats "Polar, Smith, Inverted Smith". Moreover, the
sweep type must be a "frequency sweep", and the evaluation range must contain at least
3 measurement points.
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 calcu-
lated as follows:
f
PD
deg
360
where Δf is the width of the evaluation range and Δ
Φ
is the corresponding phase
change. See also note on transmission and reflection parameters below.
●
"EL" is the electrical length, which is the 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
refer to
chapter 3.3.7, "Delay, Aperture, Electrical Length"
Note:
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 "Length
and delay measurement" in
chapter 3.6.1.3, "Auto Length"
"Tip:" 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 command:
Trace Settings
