VNA GUI Reference
R&S
®
ZNL/ZNLE
344
User Manual 1178.5966.02 ─ 07
Start Distance / Stop Distance
Define the distance window for the Distance to Fault measurement. "Start Distance"
and "Stop Distance" correspond to the left and right edge of the diagram area and are
displayed in the "Distance Domain" trace info line.
Note:
●
If the "Stop Distance" is so high that for the selected
at "far away discontinuities" would be too small, a warning tooltip is displayed:
●
If the "Stop Distance" exceeds the unambiguous range (for the given frequency
span and number of sweep points), a warning is displayed in the instrument status
bar:
function to adjust the number of sweep points so
that the impulse response becomes unambiguous in the configured distance win-
dow.
Remote command:
CALCulate<Chn>:TRANsform:DTFault:STARt
CALCulate<Chn>:TRANsform:DTFault:STOP
CALCulate<Chn>:TRANsform:DTFault:CENTer
CALCulate<Chn>:TRANsform:DTFault:SPAN
Auto Number of Points
Selects the minimum number of sweep points that are required to provide an unambig-
uous display of fault locations for the active DtF trace.
If "Auto Number of Points" actually modifies the
played:
The required number of points depends on
●
the frequency span
Δf = f
stop
– f
start
"Start Frequency / Stop Frequency / Center
●
the stop distance
d
stop
(see
"Start Distance / Stop Distance"
●
the velocity factor
v
of the transmission line (see
With
c
0
denoting the speed of light in a vacuum, the analyzer sets the number of
sweep points
N
to
N = max {
⌈
2.6 · d
stop
· Δf / (v · c
0
)
⌉
, 201}
If required number of sweep points would be higher than 100001 (the maximum num-
ber of sweep points of the R&S
ZNL/ZNLE), the analyzer sets
N
to 100001 and dis-
plays the following message box:
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