R&S ZNL, User Manual

Page: 370 / 1135

VNA GUI reference
R&S
®
ZNL/ZNLE
370 User Manual 1178.5966.02 ─ 19
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 Distance to Fault trace.
If "Auto Number of Points" actually modifies the Number of Points , a tooltip is dis-
played:
The required number of points depends on:
●
the frequency span Δf = f
stop
– f
start
(see "Start Frequency / Stop Frequency / Center
Frequency / Span Frequency" on page 311),
●
the stop distance d
stop
(see "Start Distance / Stop Distance" on page 369), and
●
the velocity factor v of the transmission line (see "Cable Type..." on page 371).
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 the required number of sweep points would be higher than 100001 (the maximum
number of sweep points of the R&S
ZNL/ZNLE), the analyzer sets N to 100001 and
displays the following message box:
"OK" reduces the frequency span Δf to
Δf = v · c
0
· 100001 / (2.6 · d
stop
), which makes 100001 sweep points sufficient for
unambiguous display (see the formula above). However, this reduction of the fre-
quency span comes at the cost of coarser distance resolution.
"Cancel" (default) leaves the frequency unchanged.
Remote command:
CALCulate<Chn>:TRANsform:DTFault:POINts
Trace softtool