Measurement Computing DASYLab User Manual - Manual (Page 66)

Appendix A The Module Groups
A-4 | dasylab.com
The Check Reference Curve checks whether data channels lie within a
tolerance range. The Pulse Analysis module evaluates pulse width
modulated signals statistically.
The Histogram Classification module calculates the single frequencies or
cumulative frequencies of the measurement values within specified classes.
The Rainflow Classification module runs classifications with one parameter
or two parameters. Use the Two Channel Classification module for two-
dimensional counting procedures, for example, to create a diagram of bearing
load rotational frequencies.
The Signal Analysis Modules Group
The signal analysis modules group contains modules for calculating
frequency components of signals or for analyzing the similarity of signals.
The FFT (Fast Fourier Transform) module transfers signals from the time
domain into the frequency domain. You can calculate real FFTs or complex
FFTs, or you can calculate an inverse FFT to transfer a signal from the
frequency domain into the time domain. The FFT Filter module filters
specific frequency components from the results of an FFT, whereas the
modules FFT Maximum and nHarmonic search for maximum values in the
FFT results. Use the Data Window module to multiply data channels with
non-periodic signals with a window function to prepare the data channels for
an FFT.
The Third/Octave Analysis module adds up the amplitude values of the FFT
in standardized logarithmic frequency intervals in order to determine the
volume in frequency ranges instead of the amplitude of each individual
frequency.
The Digital Filter module filters data channels with digital IIR filters. The
Correlation module uses the cross correlation to calculate the statistical
similarity of two data channels and uses auto-correlation to calculate how
well a data channel matches a time-shifted version of itself.
The Period Check module uses a specified zero line or reference line to
search for the first zero crossing of a signal.
The Harmonic Distortion calculates in the frequency range the amplitude
and the phase of the fundamental frequency and up to 48 harmonic
frequencies.