FFT Analyzer Data Processing
FFT Comparator
CF-4700
Overview
The CF-4700 FFT comparator is a pass/fail judgment machine used on production lines that is highly effective in accurate quality inspection by analyzing sound or vibration from products. As being incorporated our accumulated FFT technology over the years, the CF-4700 enables pass/fail judgment by extracting the amount of fluctuation of signal size focusing on a specific frequency band.
The CF-4700 comparator has newly adopted the Amplitude Modulation Component Extraction Function, besides inheriting the frequency level- or waveform shape-based judgment functions from the existing CF-4500 FFT model. The new function enables judgment on the basis of the amount of periodical fluctuation of extracted sounds or vibrations. This function is effective for making judgments on fuzzy creaks or chattering sound by a motor-driven device in operation. Moreover, two functions which are included in the Amplitude Modulation Component Extraction Function enable measurements such as 'monitoring of bearing vibrations' (by using the band pass filter and envelope functions), as well as 'auditory inspections of vibrations through headphones' (by using the monitor function which amplifies inaudible vibrations to audible sounds).
Components necessary for Performance and Endurance test are included, such as front wheel holding unit, Driver’s Display & Driver’s Aid.
Application software necessary for emission test is optional, such as emission data processing.
For users getting started on pass/fail judgment by frequency spectrum
The CF-4700 comparator comes with a new assist function that enables users to set a judgment range by a simple operation.
This assist function reads differences in levels of sounds or vibrations from passed and failed measurement data files respectively, which makes it easier to set a judgment range, even when conducting a pass/fail judgment by frequency spectrum for the first time.