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Analysis
R&S
®
RTC1000
73User Manual 1335.7352.02 ─ 04
Active settings are highlighted in white, inactive settings are gray.
The FFT menu provides further settings.
MODE
Sets the display type:
"REFRESH"
Calculates and displays the FFT without additional evaluation or edit-
ing of the captured data. The new input data is captured, displayed
and overwrites previously stored and displayed values.
"ENVELOPE"
The maximum deflections of all spectra are stored separately in addi-
tion to the current spectrum. They are updated with each new spec-
trum. The maximum values are displayed with the input data and cre-
ate an envelope curve. The spectrum is located within the envelope
limits. The envelope forms an area or a sleeve including all occurren-
ces of FFT signal values. If a signal parameter is changed, the enve-
lope curve is reset.
"AVERAGE"
Calculates the mean value from several spectra to reduce noise. The
softkey "AVERAGES" selects the number of spectra used to calculate
the mean value.
POINTS
Selects the maximum number of capture points to be included in the calculation. Possi-
ble values are 2048, 4096, 8192, 16384, 32768, 65536, 131072 points.
WINDOWS
Sets the window type to improve the FFT display. Various window functions are provi-
ded in the R&S RTC1000 to suit different input signals. Each of the window functions
has specific characteristics, including some advantages and some trade-offs. Consider
these characteristics carefully to find the optimum solution for the measurement task.
"Hanning"
The Hann window is bell shaped. Unlike the Hamming window, its
value is zero at the borders of the measuring interval. Thus, the noise
level within the spectrum is reduced and the width of the spectral
lines enlarges.
Use this window to measure amplitudes of a periodical signal pre-
cisely.
Frequency Analysis (FFT)
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