Rohde & Schwarz R&S UPP, User Manual

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Instrument Functions
R&S
®
UPP
477 User Manual 1411.1055.32 ─ 10
response of the filter remains within the specified tolerance. This file format allows fil-
ters with tight tolerances to be used over a wide range of sampling frequencies.
Poles and zeros in the
*.XPZ
file are normalized to the sampling frequencies specified
for the individual parameter sets. If a different sampling rate is configured in the R&S
UPP, the pole and zero locations in the allowable frequency range are transformed to
correspond to the actual sampling frequency so the frequency response of the filter
remains unchanged. A reference point for the frequency response, defined in terms of
a reference frequency and the reference gain at this frequency, must be specified in
the file.
5.40.6 Parameters Common to All Filters
Attenuation
Used to specify the desired filter attenuation of the stopband in dB. When the filter is
activated, the attenuation actually implemented must be entered here (this attenuation
is normally greater than the entered value). Filter attenuation in steps of approx. 10
dB
is possible.
Remote command:
SENSe[1]:UFILter<n2>:ATTenuation
on page 774
Delay
Displays the estimated settling time of the filter. This value is only updated after the fil-
ter is activated.
Exception: With file-defined filters, a settling time is calculated and displayed after the
coefficients are read in. This settling time can then be changed manually.
Remote command:
SENSe[1]:UFILter<n2>:DELay
on page 774
Short Name
Displays a short name under which the filter can be called up in the analyzer or gener-
ator. The short name consists of the filter type code (2 letters) and the frequency. (LP =
lowpass filter, HP = highpass filter, BP = bandpass filter, BS = bandstop filter, TZ =
third-octave filter, OC = octave filter, NO = notch filter).
The name of the file is shown here in the case of file-defined filters.
5.40.7 Filter Settling Time
The settling time of the filter can be estimated from the filter parameters. Certain filters
(e.g. filters with steep edges and narrowband bandpass filters) have longer settling
times.
When measurement is started (e.g. by making new settings, pressing the start key or
in the case of a sweep), the R&S
UPP waits until this settling time expires for every
filter before performing the actual signal integration. If (in exceptional cases) the calcu-
User-Definable Filters