Instrument Functions
R&S
®
UPP
413
User Manual 1411.1055.32 ─ 10
●
Averaging
Measurement is performed in the same level as the other measurement functions, i.e.
downstream of all filters.
The Function FFT is calculated with double precision using up to 256
k
points, thus
ensuring a very high frequency resolution and dynamic range.
The Function FFT of a measurement channel is displayed in the graphical windows
"FFT, Panel 1" or "FFT, Panel 2" either as a magnitude or phase. Since 2 traces are
displayed in each graphical window, the magnitude and phase of both channels can be
recorded simultaneously.
Function (FFT)
Used to change the measurement function to FFT analysis.
The band-limited and, possibly, filtered RMS is displayed as the function measurement
result. The RMS is calculated by means of integration over all magnitude frequency
lines from "Start" to "Stop".
The frequency and phase value derived from the FFT is displayed as the "Freq/Phase"
measurement result if "Precision" is set as "Meas Time" for the frequency measure-
ment.
With AC coupling (analog) or "DC Suppress" (digital), the DC component (bell-shaped
curve) is not included in the measurement. If a Window function is used, it is 5
bins
wide, so that the bottom 6
bins are not included in the RMS result.
Note:
To include very low frequency signals in the RMS value, either the FFT size
must be selected sufficiently large (so that the desired signal components are above
the 6th
bin) or the rectangular window must be used (which ignores only the DC bin).
The panel segment shown here represents a digital FFT that is band
‑
limited to 12
kHz.
With this FFT, the "Start" value is always 0.0
Hz; the "Stop" value is the resulting band-
width. Resolution and Meas Time depend on the selected FFT size.
Remote command:
FFT
Delay Ch1, Delay Ref Chan
Used to activate the delay compensation.
This compensates delay differences of the DUT.
Two-channel analyzers:
The time by which Channel 1 is to be offset relative to Channel 2 is entered. If the
delay of Channel 2 is shorter than that of Channel 1, this can be compensated by
entering a negative time.
Multichannel analyzers:
FFT Analysis
Summary of Contents for R&S UPP
Page 1: ...R S UPP Audio Analyzer User Manual User Manual Version 10 1411105532 ÅP ...
Page 34: ...Contents R S UPP 18 User Manual 1411 1055 32 10 ...
Page 630: ...Instrument Functions R S UPP 614 User Manual 1411 1055 32 10 Format ...
Page 631: ...Instrument Functions R S UPP 615 User Manual 1411 1055 32 10 Format ...
