Rohde & Schwarz R&S UPP, User Manual

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Instrument Functions
R&S
®
UPP
395 User Manual 1411.1055.32 ─ 10
Reference value is the un weighted input signal, band-limited to Frq Lim Upp (such
as R&S UPL / UPD without weighting filter).
●
Scenario 2 – Prefilter off , function filter on :
Reference value is the un weighted broadband input signal.
●
Scenario 3 – Prefilter as weighting filter, function filter off :
Reference value is the weighted input signal, band-limited to Frq Lim Upp.
●
Scenario 4 – Prefilter as weighting filter, function filter on :
Reference value is the weighted , broadband input signal.
●
Scenario 5 – Prefilter as lowpass filter with cutoff frequency like Frq Lim Upp, func-
tion filter as weighting filter :
Reference value is the unweighted input signal, band-limited to "Frq Lim Upp " (as
with R&S
UPL / UPD with weighting filter).
For a description of selectable weighting filters, see Chapter 5.41, "Weighting Filters" ,
on page 478.
Note: The previous generation of instruments R&S UPL and R&S UPD did not allow a
prefilter to be selected. Consequently, only measurement scenarios 1 and 5 were pos-
sible with these instruments.
Note: The upper band limit can be limited in the analog analyzer using the "Bandwidth"
parameter field, which has the same effect as an additional lowpass filter.
Remote command:
SENSe[1]:FILTer<n2>
on page 773
For a description of the filters and their setting parameters, see Chapter 5.39.4, "Filter
Table" , on page 468.
Frq Lim Low
Used to enter the lower band limit for calculating the distortion voltage; this limit does
not affect calculation of the total RMS.
Remote command:
SENSe[1]:FREQuency:LIMit:LOWer
on page 760
Frq Lim Upp
Used to enter the upper band limit for calculating the distortion voltage and the total
RMS value.
Note: If the fundamental of the measurement signal is above "Frq Lim Upp", the refer-
enced measurements (THD+N, SINAD and Noise) are not to be performed because
the energy of the fundamental is filtered out in the reference value. An error message
appears in the user info line and the measured value is identified as invalid (---).
Remote command:
SENSe[1]:FREQuency:LIMit:UPPer
on page 760
Fnct Settling
See section Settling for Measurement Functions for description of the settings and
associated remote control commands.
Distortion Measurements