R&S ZNL, User Manual

Page: 201 / 1135

VNA concepts and features
R&S
®
ZNL/ZNLE
201 User Manual 1178.5966.02 ─ 19
Marker Format Description Formula
Imp Mag paral-
lel***)
Magnitude of parallel impedance **) |Z
p
| = (R
p
2 + X
p
2 ) 1/2
Adm Mag
or
Adm Mag series***)
Magnitude of (series) admittance
**)
|Y
s
| = (G
s
2
+ B
s
2
)
1/2
Adm Mag paral-
lel***) Magnitude of parallel admittance **) |Y
p
| = (G
p
2 + B
p
2 ) 1/2
Index Index of the current sweep point –
*) The delay aperture is defined in the [Trace] > "Format" softtool.
**) An impedance Z is represented as Z = R + jX, the corresponding admittance as Y =
1/Z = G + jB. For X ≥ 0, we have an inductance L = X/ω, for X < 0 we have a capaci-
tance C = 1/(ωX), where ω denotes the stimulus frequency.
***) Only available for transmission measurements (see Chapter 9.3.3.1, "Converted
impedances" , on page 219)
Marker coupling
It connects the markers of a set of traces.
Marker coupling allows you to compare different measurement results (assigned to dif-
ferent traces) at the same stimulus value. It connects the markers of a set of traces.
Marker coupling can be enabled:
●
Either for all traces in the active channel setup that have the same stimulus vari-
able as the active trace
●
or for all traces in a channel
●
or for all traces in a diagram that have the same stimulus variable as the active
trace
When marker coupling is enabled, the same markers are activated for all related
traces: if a marker was active for some related trace, then it is activated for all related
traces.
While marker coupling is active, the marker sets of the related traces are always kept
in sync, i.e.:
●
If a marker is added to (removed from) one of the related traces, it is also added to
(removed from) the other related traces.
●
If a marker is moved to a particular stimulus value for one of the related traces,
then it is moved to this stimulus value for all related traces.
If the new stimulus value is outside a trace's sweep range, the marker value is
invalid for this trace. The corresponding info field only displays the stimulus value.
Only one kind of marker coupling can be enabled. For instance, it is not possible to
couple markers per channel and per diagram at the same time.
VNA screen elements