Rohde & Schwarz R&S UPP, User Manual

Page: 269 / 938

Instrument Functions
R&S
®
UPP
253 User Manual 1411.1055.32 ─ 10
"Anl Trk" The frequency grid is adopted from the FFT set in the analyzer. This
value depends on the sampling rate and the size of the FFT. This set-
ting is only possible if an FFT or Post FFT is selected in the analyzer.
The parameter field where a value would be entered for this setting is
grayed out and the value is displayed.
Note: The finest frequency grid corresponds to an FFT size of 16 k.
ARB files labeled
pseudoRandomxxxk.arb
are available for mea-
suring longer FFTs – and, therefore, smaller frequency grid – in the
"User" folder.
xxx
is the FFT size expressed in k, to which the fre-
quency grid of the generator is dimensioned. The prerequisite is that
the generator and analyzer are operated at the same sampling rate/
same analog bandwidth.
Remote command:
SOURce:RANDom:SPACing:MODE
on page 704
SOURce:RANDom:SPACing:FREQuency
on page 704
Lower Freq
Used to define the lower frequency limit of the noise signal if Shape is set to White or
Pink.
Remote command:
SOURce:RANDom:FREQuency:LOWer
on page 707
Upper Freq
Used to define the upper frequency limit of the noise signal if Shape is set to White or
Pink.
Remote command:
SOURce:RANDom:FREQuency:UPPer
on page 707
Mean Freq
Used to set the center frequency in the case of third-octave noise.
Remote command:
SOURce:FREQuency:MEAN
on page 707
Volt Peak
Used to enter the peak value of the noise signal. The maximum value depends on the
configured DC offset. In the analog generator, the maximum total voltage also depends
on the settings for Output Type and Max Voltage in the Generator Config panel.
The peak value to RMS value ratio of the signal (crest factor) is minimized. If the noise
is defined in the time domain, the selected distribution function for amplitude deter-
mines the crest factor.
Remote command:
SOURce:VOLTage:TOTal
on page 704
Generator Signals