Analysis
R&S
®
RTC1000
74
User Manual 1335.7352.02 ─ 02
"Hamming"
The Hamming window is bell shaped. Its value is not zero at the bor-
ders of the measuring interval. Thus, the noise level inside the spec-
trum is higher than Hanning or Blackman, but smaller than the rectan-
gular window. The width of the spectral lines is thinner than the other
bell-shaped functions.
Use this window to measure amplitudes of a periodical signal pre-
cisely.
"Blackman"
The Blackman window is bell shaped and has the steepest fall in its
wave shape of all other available functions. Its value is zero at both
borders of the measuring interval. In the Blackman window, the
amplitudes can be measured precisely. However, determining the fre-
quency is more difficult.
Use this window to measure signals with single frequencies to detect
harmonics and accurate single-tone measurements.
"Rectangle"
The rectangular window multiplies all points by one. The result is a
high frequency accuracy with thin spectral lines, but also with
increased noise.
Use this function for measurements of separation of two tones with
almost equal amplitudes and a small frequency distance.
Y-SCALING
Sets the scale of the amplitude in FFT: logarithmically ("dBm" / "dBV") or linear ("Veff").
The unit dBm (Decibel-Milliwatt) refers to 1 mW. The unit dBV (Decibel-Volt) refers to
1
V
eff
.
FFT OFF
Deactivates the FFT function. Alternatively, you can press the FFT key on the control
panel again.
Frequency Analysis (FFT)
