ONO SOKKI FFT Comparator CF-4700

• The Block Comparator Function for pass/fail judgment from the level of characteristic frequency signal using a preset judgment block area.

• The Shape Comparator Function for pass/fail judgment by waveform shape. (Option)

• The Tracking Function for pass/fail judgment by capturing level variation in specified order while rotational speed is varied. (Option)

• The Amplitude Modulation Component Extraction Function that enables pass/fail judgment by extracting the amount of periodical fluctuations in sound or vibration caused by buzzing or chattering. (Option)

• The Assist Function for setting the judgment block area from the difference between frequency characteristics of OK and NG products.

• Accepts TEDS sensor for automatic unit calibration. (Accelerometer and microphone that conform to IEEE 1451.4 ver. 0.9 and ver. 1.0)

• The Cable Disconnection Detecting Function for detecting cable disconnection or connector trouble automatically when using constant current line drive (CCLD) type sensor.

• Measurement conditions and data can be stored on a USB memory.

• An open collector output for the judgment results of total and individual blocks to PLC*. The main unit is controllable by command assignment (up to 9 inputs).

• The Power Source Backup Function prevents loss of measurement data in case of a main power down. (Option).

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).

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.