R&S ZNB, Руководство пользователя

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GUI Reference
R&S
®
ZNB/ZNBT
388 User Manual 1173.9163.02 ─ 55
Optimizing the filter settings
A small bandwidth and a high selectivity of the digital IF filter suppress the noise level
around the measurement frequency, and thus increase the dynamic range. However,
the measurement time increases with smaller filter bandwidths and high selectivity. For
small bandwidths, the filter settling time, which is inversely proportional to the band-
width, is responsible for the predominant part of the measurement time.
The characteristics of the high selectivity filter make it particularly suitable for isolating
unexpected spurious responses or known mixer products.
Segmented sweeps
In segmented frequency sweeps, the filter settings can be selected independently for
each segment. see
Chapter 6.10.2.2, "Define Segments Dialog" , on page 399.
Bandwidth
"Bandwidth" the measurement bandwidth of the IF filter. Within the value range, the
entered value is rounded up to 1 · 10
n
Hz, 1.5 · 10
n
Hz, 2 · 10
n
Hz, 3 · 10
n
Hz, 5 · 10
n
Hz, 7 · 10 n Hz (n
≥
0). Values exceeding the maximum bandwidth are rounded down.
The regular bandwidth range is 1 Hz to 1 MHz. Option R&S ZNB-K17/R&S ZNBT-K17
enables bandwidths up to 10 MHz (see Chapter 5.7.5, "Receiver Bandwidth 10 MHz" ,
on page 225).
Remote command:
[SENSe<Ch>:]BANDwidth[:RESolution]
[SENSe<Ch>:]BWIDth[:RESolution]
Selectivity
Selects the shape of the IF filter:
●
Filters with "Normal" selectivity provide the shortest settling time (recommended for
fast measurements).
●
"Medium" selectivity filters have steeper edges but require longer settling times.
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