B&K Precision 2516 - Manual - Manual (Page 52)

52
Window
(see table
below)
Selects FFT windowing.
FFT Zoom 1X, 2X, 5X, 10X Zoom function of FFT waveform.
Table 11 - FFT Window Options
Window Characteristic Best Use Cases
Rectangular
The best frequency
resolution but the
worst magnitude
resolution. It is
essentially the same as
having no window. Symmetric transients or bursts.
Equal-amplitude sine waves
with fixed frequencies.
Broadband random noise with
a relatively slowly varying
spectrum.
Hanning
Better frequency,
poorer magnitude
accuracy than
rectangular
window Sine, periodic, and narrow-
band random noise.
Hamming
Hamming has a slightly
better frequency
resolution than
Hanning. Transients or bursts pulse. The
ranges of the signals have great
difference from before to after.
Blackman
Best magnitude
resolution but worst
frequency resolution. Single frequency waveforms, to
find higher order harmonics.
Table 12 - FFT Menu 2/2
Menu Option Setting Description
Scale
dBVrms Set unit scale to dBVrms
Vrms Set unit scale to Vrms
Display
CH1 Selects channel 1 as FFT source.
CH2 Selects channel 2 as FFT source.
ToZero Selects FFT windowing.