8
Convert the time domain to the frequency domain for analysis
- FFT analysis function -
FFT analysis function
Time domain
The single-channel FFT function is used in spectrum analysis. The two-
channel FFT function analyzes transfer functions. The octave analysis function
is used in acoustic analysis. The signal source for FFT analysis is a section
obtained from the waveforms captured in the MEM function (the required
number of pieces of data for FFT analysis are 1000 to 20,000 points). The
calculation speed for the same condition (when performing the most time-
consuming analysis) is about ten times faster than with the conventional Model
8855.
Frequency domain
n Simultaneously perform up to 16 calculations
Unlike with the conventional HIOKI 8855 and 8841 models that
allow for the simultaneous performing of up to two calculations,
the 8860-50 and 8861-50 models allow for the simultaneous
performing of up to eight (four times more) FFT calculations
for analysis. Furthermore, the analysis channel can be selected
independently.
n Split screen (a total of 14 patterns)
You can select a split screen
format according to your needs.
For example, the MEM and REC
functions allow you to select
a different split screen format
independently for each sheet. Unlike
with, for example, the conventional
8855 and 8841 models, a function
to display superimposed graphs is
also supported (however, the function
depends on the analysis mode).
n A variety of window functions
Unlike with the conventional 8855 and 8841 models that
support only the three window function options “Rectangular,”
“Hanning,” and “Exponential,” the 8860-50 and 8861-50
models include four additional options, thus enabling you
to select a window function from a total of seven options.
Furthermore, a difference in calculation results of line spectrum
between other companies’ FFT analyzers and HIOKI’s analyzer
can be compensated by selecting the energy attenuation
compensation method when using a window function.
n Phase Highlight Display
Phase Highlight emphasizes on the display only those parts of a
waveform that exceed a certain level, in order to acquire a power
spectrum in the midst of phase calculation. The figure shows
power and phase spectra at the same time when the highlighted
display is enabled, so you can easily see important parts of the
waveform that are normally difficult to see because they appear
like noise.
n Change the settings on the DISP screen
The dialog bar on the top of the DISP screen (waveform
monitoring screen) allows you to change the settings.
The frequency resolution and capture time are also displayed.
ASM-SENSOR [ ASM GMBH ]
