R&S ZVL
GUI Reference
Trace Menu
Operating Manual 1303.6580.32-06
176
All marker formats are available irrespective of the measured quantity. The output values are calculated
by a simple conversion of a complex measurement result, where the marker format defines the conversion
rules. This flexibility in the calculation must be kept in mind when interpreting the results and physical units
displayed; see also Measured Quantities and Display Formats.
Short description of marker formats
The formats of the markers assigned to a trace are independent of each other and of the trace format
settings. The following table gives an overview on how a complex marker value z = x + jy is converted.
Marker Format
Description
Formula
dB Mag
Magnitude of z in dB
|z| = sqrt ( x
2
+ y
2
)
dB Mag(z) = 20 * log|z| dB
Lin Mag
Magnitude of z, unconverted
|z| = sqrt ( x
2
+ y
2
)
Phase
Phase of z
X
(z) = arctan (y/x)
Real
Real part of z
Re(z) = x
Imag
Imaginary part of z
Im(z) = y
SWR
(Voltage) Standing Wave Ratio
SWR = (1 + |z|) / (1 – |z|)
Delay
Group delay, neg. derivative of the phase response*
)
– d
X
(z) / d
Y
dB Mag and Phase
Magnitude of z in dB and phase in two lines
20 * log|z| dB
arctan ( Im(z) / Re(z) )
Lin Mag and Phase
Magnitude of z (unconverted) and phase in two lines
|z|
arctan ( Im(z) / Re(z) )
Real and Imag
Real and imaginary part of z in two lines
x
y
Default (Trace)
Marker format identical with trace format
–
R + j X
Unnormalized resistance and reactance; L or C in three lines
(Smith diagram)
R
X
L or C**
)
G + j B
Unnormalized conductance and susceptance; L or C in three lines
G
