GUI Reference
R&S
®
ZNB/ZNBT
473
User Manual 1173.9163.02 ─ 38
Properties:
The stimulus variable appears on the horizontal axis, scaled linearly. The
real part Re(C) of the complex quantity C = Re(C) + j Im(C), appears on the vertical
axis, also scaled linearly.
Application:
The real part of an impedance corresponds to its resistive portion.
Tip (alternative formats):
It is possible to view the magnitude and phase of a complex
quantity instead of the real and imaginary part. The magnitude can be displayed on a
linear scale or on a logarithmic scale. Both the real and imaginary parts are displayed
in the polar diagram.
Remote command:
REAL
Imag
Selects a Cartesian diagram to display the imaginary part of a complex measured
quantity.
Properties:
The stimulus variable appears on the horizontal axis, scaled linearly. The
imaginary part Im(C) of the complex quantity C = Re(C) + j Im(C), appears on the verti-
cal axis, also scaled linearly.
Application:
The imaginary part of an impedance corresponds to its reactive portion.
Positive (negative) values represent inductive (capacitive) reactance.
Tip (alternative formats):
It is possible to view the magnitude and phase of a complex
quantity instead of the real and imaginary part. The magnitude can be displayed on a
linear scale or on a logarithmic scale. Both the real and imaginary parts are displayed
in the polar diagram.
Remote command:
IMAGinary
Delay
Calculates the (group) delay from the measured quantity (primarily: from a transmis-
sion S-parameter) and displays it in a Cartesian diagram.
Properties:
The group delay τ
g
represents the propagation time of wave through a
device. τ
g
is a real quantity and is calculated as the negative of the derivative of its
phase response. A non-dispersive DUT shows a linear phase response, which produ-
ces a constant delay (a constant ratio of phase difference to frequency difference).
For more information, refer to
Chapter 4.3.8, "Delay, Aperture, Electrical Length"
Application:
Transmission measurements, especially with the purpose of investigating
deviations from linear phase response and phase distortions. To obtain the delay a fre-
quency sweep must be active.
Tip:
The cables between the analyzer test ports and the DUT introduce an unwanted
delay, which often can be assumed to be constant. Use the Zero Delay at Marker func-
tion, define a numeric length "Offset" or use the "Auto Length" function to mathemati-
cally compensate for this effect in the measurement results. To compensate for a fre-
quency-dependent delay in the test setup, a system error correction is required.
Note:
The delay for reflection factors corresponds to the transmission time in forward
and reverse direction; see "Length and delay measurement" in
Format Softtool
