Rohde & Schwarz R&S UPP, User Manual

Page: 394 / 938

Instrument Functions
R&S
®
UPP
378 User Manual 1411.1055.32 ─ 10
You can decide whether any DC level which may be present in the RMS value should
be taken into account or suppressed.
This parameter field is not available in the analog analyzer because the suppression
function is already provided by the AC coupling which can be set up using the hard-
ware.
"deactivated" DC suppression deactivated.
The DC component of the measurement signal is
not suppressed
("DC coupling") and is included in the measurement result.
"activated" DC suppression activated.
The DC component of the measurement signal is suppressed ("AC
coupling"); the measurement result includes the AC component only.
For DC suppression in the digital analyzer, the DC level is measured
and subtracted from the total RMS value.
Remote command:
SENSe[1]:FUNCtion:DCSuppression
on page 757
Filter
Activating a digital filter in the test channel. Up to 2 user-defined or weighting filters can
be looped into the measurement path. At least one of the 2 filters in the analog ana-
lyzer should be a highpass or comparable weighting filter in order to filter out the DC
jump when the generator is turned off. For this purpose, HighPass 22
Hz is activated in
Filter #1 by default.
The user-definable filters are configured as filters 01 to 09 in the filter panel (see Chap-
ter 5.40, "User-Definable Filters" , on page 469) and can then be used (repeatedly if
necessary) in the analyzer.
For a description of selectable weighting filters, see Chapter 5.41, "Weighting Filters" ,
on page 478.
The filters chosen in this way work during noise measurement only. During signal mea-
surement they are bypassed. This makes it possible to apply a deliberate weighting to
the noise signal without affecting the other signal level.
Note: The input filter "prefilter" in the configuration part of the analyzer affects both sig-
nal measurement and noise measurement. Thus if there is a need for a filter that also
filters the signal component, it can be chosen as a prefilter. Moreover the analog band-
width can be restricted with the aid of the "Bandwidth" parameter field, which corre-
sponds to an additional lowpass filter.
Signal-to-Noise Measurements