Rohde & Schwarz R&S UPP, User Manual

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Instrument Functions
R&S
®
UPP
478 User Manual 1411.1055.32 ─ 10
lated time is too short, the filters cannot settle properly before the measurement is star-
ted. This can result in unstable measured values.
The following trick can be used to remedy this problem:
If the
DELAY.COE
file-defined filter (in the
D:\UPV\USER
directory) is selected, a set-
tling time can be entered there, which is added to the settling time of the other filters
when measurement is performed. The
DELAY.COE
filter has no other function.
If a multichannel analyzer is used, the total settling time of all activated analyzer filters
is limited to 150 000
samples (at 40 kHz analog bandwidth, this corresponds to a set-
tling time of approx. 1.5 s). If this is not long enough (e.g. if four very steep-edged fil-
ters are used), an additional delay may be entered under "Start Condition".
With continuous measurement, the filter settling time is added only with the (re)start of
the first measurement. All further measurements in this case are performed without
delay.
If a multichannel analyzer is used, the signal is not monitored continuously during con-
tinuous measurement; the filter settling time is therefore added with each subsequent
measurement as well.
5.41 Weighting Filters
In addition to the user-definable filters, the R&S UPP also offers a large number of
weighting filters which conform to the relevant standards.
The weighting filters and the fixed highpass and lowpass filters are not selected in the
Filter panel. They are selected together with the user-configurable filters in the selec-
tion fields of the analyzer and generator.
Remote-control command:
INPut[1]:FILTer
on page 773
Filters: A Weighting
Standards: DIN 45412, DIN 45633
IEC 179, IEC 651
ANSI S1.4
Application: Weighted
noise measurement
Weighting Filters