R&S ZNB Series User Manual page 730

®
R&S ZNB/ZNBT
The required number of points depends on:
●
the frequency span Δf = f
Frequency / Span Frequency"
●
the stop distance d
●
the velocity factor v of the transmission line (see
With c
sweep points N to
N = max { ⌈ 2.6 · d
If the required number of sweep points would be higher than 100001 (the maximum
number of sweep points of the R&S ZNB/ZNBT), the analyzer sets N to 100001 and
displays the following message box:
"OK" reduces the frequency span Δf to
Δf = v · c
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
Cable Type...
Opens a dialog that allows to select a preconfigured cable type to be used for the cal-
culation of the Distance to Fault traces on the active channel. A cable type is defined
by its relative permittivity (or its velocity factor), and a frequency-dependent attenuation
table.
User Manual 1173.9163.02 ─ 62
(see
stop
denoting the speed of light in a vacuum, the analyzer sets the number of
0
· Δf / (v · c
stop
· 100001 / (2.6 · d
0 stop
– f (see "Start Frequency / Stop Frequency / Center
stop start
on page 414),
"Start Distance / Stop Distance"
) ⌉ , 201}
0
), which makes 100001 sweep points sufficient for
GUI reference
Applic softtool
on page 729), and
"Cable Type..." on page 730).
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