FFT Comparator CF-4700A New
Highly recommended for the pass/fail judgment by frequency spectrum
The CF-4700A 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-4700A enables pass/fail judgment by extracting the amount of fluctuation of signal size focusing on a specific frequency band.
The CF-4700A 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).
The CF-4700A 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.
Features
4 comparator functions make judgments of OK and NG products
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)
Other functions
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).
* Programmable Logic Controller
Functions
1. Block Comparator (Judging by frequency level)
The Block Comparator Function makes pass/fail judgments using a block area which is set in a certain frequency and level range. The judgment is made in terms of whether a peak value or level of a target signal coincides with the conditions which are set in advance or not. 6 kinds of judgment methods (level, peak level, peak max, inside max, partial overall, areal content rate) are available for each block. The judgment block can be determined by drag operation at a touch of a screen or by directly entering a numeric value on a list screen.
Related function:Block Comparator Function
Assist Function
2. Shape Comparator (Judging by shape of waveform)
The Shape Comparator Function makes pass/fail judgments by waveform shape. By setting a judgment line, this function enables pass/fail judgments on subtle variations in a time waveform or on differences in spectral shapes. In order to avoid misjudgment due to instantaneous noises in a time waveform, if the number of data exceeding the judgment level is equal to or smaller than a set value, they are assumed to be noises and can be excluded from the target data for the judgment
Related function: CF-0472 Shape Comparator Function
3. Shape Comparator (Judging by shape of tracking waveform)
For sound or vibration measures of rotating equipments, it is important to measure or analyze which rotational speeds increase sound or vibration and which parts of rotating machine cause sound or vibration. The CF-4700A FFT Comparator can follow up a change of rotational speed and extract a component of sound or vibration which is based on rotation, and then make pass/fail judgments by its level or changing situation.
Related function: CF-0472 Shape Comparator Function
CF-0471 Tracking Function
4. Amplitude Modulation Component Extraction Function
(Judging by the amount of fluctuation of signal size in a specific frequency band)
The Amplitude Modulation Component Extraction Function is a preprocessing function to extract the amount of fluctuation of signal size in a specific frequency band. This function is effective for making judgments on abnormal sound
or vibration stemming from fluctuations in signal size, and can be used as a preprocessing function for making pass/fail judgments on fuzzy creaks or chattering by a motor-driven device in operation. Also enables measurements
such as 'monitoring of bearing vibrations' using the bandpass filter and envelope functions, and 'auditory inspections of vibrations through headphones' using the monitor function which amplifies inaudible vibrations to audible
sounds.
Related function:CF-0473A Amplitude Modulation Component Extraction Function
5. Power Source Backup Function (Effective countermeasure against accidental power failure)
At the production site, an instantaneous power failure or sudden large drop in the voltage of the production line's main power could occur accidentally. The Power Source Backup Function deactivates the CF-4700A in a normal manner in the event of a main power down of the production line. There is no need to prepare an uninterruptible power supply separately. Moreover, presetting of startup conditions helps a smooth restart at the time of power restoration. This function also allows for centralized power control of the production line. In other words, the CF-4700A can be turned on or off by mere operation of the control panel of the production line's main power.
Related function:CF-0478A Power Source Backup Function
Front & Rear Panel
System Configurations
Irregularity in the rotation of a door mirror drive motor while it is opened or closed may generate unusual fuzzy noises having periodic fluctuation components. These noises can be detected by the amount of periodic fluctuation extracted by the Amplitude Modulation Component Extraction Function from the door mirror motion sound measured with the MI-1235 1/2-inch Measurement Microphone and the MI-3111 Microphone Preamplifier. Using the Amplitude Modulation Component Extraction Function it may be possible to make judgments on sounds that cannot be judged simply by the sound level.
Function used : CF-0473A Amplitude Modulation
Damage of bearings causes abnormal vibrations. The CF-4700A performs diagnosis of bearings by inputted signal from an accelerometer attached on the rolling bearing. A basic frequency analysis according to a damaged part can be performed by optional band pass filter and envelope function (included in the CF-0473A Amplitude Modulation Component Extraction Function), which filters a frequency band in vibration caused from a damaged bearing. The amplitude in a frequency band tells the timing of bearing maintenance. Also the filter can be set while listening to the sounds from bearing through headphones.
Function used : CF-0473A Amplitude Modulation
Component Extraction Function
The CF-4700A can perform quality control of transmission by tracking analysis of vibration signal from a transmission. In this example, the CF-4700A performs tracking analysis with rotational pulses from a rotation controller in a transmission tester. Rotational tracking analysis of meshing order is performed using measured vibration by the NP-3000 Series Accelerometer with Built-in Preamplifier in terms of varying rotational speed from idling to the maximum. Pass/fail judgment of the transmission is made by setting a judgment line along the tracking data.
Function used : CF-0471 Tracking Function + CF-0472 + CF-0472 Shape Comparator Function
The frequency spectrum of a hammering sound is affected by cracks or fractures of a metal part (e.g. a casting part). In this example, the metal part is suspended in free vibration for hammer exciting, and an inspection is made from the hammering sound. The hammering sound is measured by the LA-4441A Integrating Sound Level Meter. Then via AC output, inputted to the CF-4700A which performs a frequency analysis to find the difference in power spectrum shape between OK and NG products. The CF-4700A makes judgments using the Shape Comparator Function with the difference.
Function used : CF-0472 Shape Comparator Function
Sometimes power frequency sound and high frequency sound are generated from electronic parts on a power supply board. In this example, abnormal sound coming from a power board is measured by the MI-1235 1/2-inch Measurement Microphone and the MI-3111 Microphone Preamplifier in an anechoic box to avoid influence of background noise. Then the signal is inputted to the CF-4700A for frequency analysis. The CF-4700A makes pass/fail judgment with areal content rate in power spectrum by setting up of a judgment block around the power frequency caused the abnormal sound.
Function used : Block Comparator Function
A wire harness device inside a sliding door of automobile sometimes makes abnormal sound while the door is in motion. The wire winding sound can be used for inspection. Drive a motor of wire harness device in a sound insulating box and the LA-1411 Integrating Sound Level Meter measures the sound from the device. Then the CF-4700A performs frequency analysis of the AC output signal from the Sound Level Meter to make pass/fail judgment of the partial overall level in a specific frequency band.
Function used: Block Comparator Function
When a turbo fan has imbalance, the signal from a vibration sensor attached on it increases. Therefore, it is effective for imbalance inspection to measure vibrations of the rotating turbofan. By using signals from the NP-3000 Series Accelerometer with Built-in Preamplifier, you can define the target frequency band and the judgment level, then set judgment blocks to the CF-4700A FFT comparator. In this case, the "peak max" is selected as the judgment method. If the maximum value of the waveform exists in the specified block area, it means OK. If not exists, it means NG.
Function used : Block Comparator Function
Digital I/O
Digital I/O | Recommended Connection Circuit / Specifications | |
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DIGITAL INPUT
The following functions are assigned to the connector. • Control by command assignment (max. 9 terminals) |
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Input type : Driven by contact or open collector (shared common, 9 inputs and common are isolated together)
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STATUS OUTPUT
Outputs 4 kinds of statuses. |
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Output type : Open collector (4 outputs are separated, each signal is isolated.) Output withstand voltage : 30 V
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COMP OUTPUTAny 5 judgment setups can be selected from 20 and the results can be outputted. |
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Output type : Open collector (shared common, 5 outputs and common are isolated together)
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Specifications
Input Section
General input | |
Number of input channels | 1 channel |
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Input connector type | C02 type (BNC) |
Input type | Single-ended, isolated |
Input impedance | 1 MΩ±0.5 %, 100 pF or less |
Input coupling | DC or AC (-3 dB±0.3 dB at 0.5 Hz) |
Power supply current for sensor (CCLD) | +24 V、E mA |
TEDS function (* Note) | Accepts accelerometer and microphone conforming to IEEE 1451.4 ver.0.9, ver.1.0.
TEDS ver.0.9 (0: accelerometer, 12: microphone) TEDS ver.1.0 (25: accelerometer, 27: microphone) |
Maximum input voltage | 30 Vrms (42.4 Vpeak) |
Absolute maximum input voltage | 70 Vrms AC 1 minute (50 Hz) |
Input voltage range | 1 Vrms, 31.62 Vrms (2 ranges) |
DC offset | -60 dB full scale or less (When auto zero is on and DC coupling) |
Amplitude flatness | ±0.1 dB |
Harmonic distortion | -90 dB or less (Standard, when optional filter is off) |
Full-scale accuracy | ±0.1 dB (At 1 kHz) |
Aliasing | -90 dB or less |
Amplitude linearity | ±0.0015 % or less (at full scale) |
Input level monitor | Lights up in red LED at excessive input. (Lights up in red for 95% of input voltage range) |
Dynamic range | 110 dB or more |
A/D converter | 24 bits type ⊿Σ |
External trigger input | |
Input connector type | C02 type (BNC) |
Input voltage range | ±12 V |
Input impedance | 100 kΩ |
Input coupling | DC or AC |
Input frequency range | 0 to 300 kHz (out-of-band filter 330 kHz, -3 dB) |
External sample input | |
Input connector type | C02 type (BNC) |
Input voltage range | ±12 V |
Input impedance | 100 kΩ |
Input coupling | DC or AC |
Input frequency range | 0 to 300 kHz (out-of-band filter 330 kHz, -3 dB) |
Analog filter | |
High-pass filter (HPF) | Cut-off frequency (Selectable) 1, 3, 10 Hz |
10 Hz conforms to vibration severity standards filter. (3 order Butterworth, ISO 2954) | |
Low-pass filter (LPF) | Cut-off frequency (Selectable) 1k, 10 kHz |
1 kHz conforms to vibration severity standards filter. (3 order Butterworth, ISO 2954) | |
Digital filter | |
Frequency weighting filter | A, C (Conforms to IEC 61672-1:2013 Class1, ANSI S1.4-2014/Part1 Class1, JIS C 1509-1:2017 Class1 (Compatible in terms of the filter shape)) |
* Note: If a TEDS supported sensor made by other companies is used, TEDS information may not be read depending on the type of a TEDS tip included in a sensor.
1. If you are considering the purchase of a TEDS sensor made by other companies, please consult to the manufacturer or dealer of the TEDS sensor, and perform the operation check.
2. When you want to use a TEDS sensor you already have with the TEDS supported measurement instruments made by Ono Sokki, please perform the operation check with a demonstration product of Ono Sokki. (Please consult your nearest distributor or Ono Sokki sales office nearby.)
Display
Size | 8.4-inch |
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Resolution | 800 x 600 * |
Method | TFT color LCD with resistive film type touch panel |
Brightness adjustment | ON/OFF 2 levels |
Lighting (backlight) | LED |
Analysis Section
Frequency range | 1 Hz to 40 kHz |
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Number of sampling points/analysis points | 256/100, 512/200, 1024/400, 2048/800, 4096/1600, 8192/3200, 16384/6400 |
Real-time analysis | 40 kHz (16384 points or less, at internal sampling) |
Overlap processing | MAX, 75 %, 66.7 %, 50 %, 25 %, 0 %, optional setup |
Window function | Rectangular, Hanning, flat-top |
Time waveform processing function | First and second order differentials, single and double integrals
Absolute value conversion, DC cancel, trend elimination, smoothing |
FFT calculation | 32-bit floating point (IEEE single-precision format) |
Trigger function | |
Trigger level | -99 to 99 (Unit: %) Default value: 25 % |
Hysteresis level | 0 to 99 (Unit: %) Default value: 2 % |
Position | ±8191 |
Trigger mode | Free, repeat, single, one-shot |
Slope | +, -, ± |
Trigger source | CH1, external trigger input |
Averaging function | |
Number of averaging setup | 1 to 65535 times |
Averaging setup time | 0.1 to 999.9 seconds (Interval: 0.1 second) |
Time domain | Arithmetic mean, exponential average |
Frequency domain | Arithmetic mean, exponential average, peak hold, max overall |
Amplitude domain | Histogram addition average |
Averaging control function | A/D over cancel |
Processing Functions | |
Time domain | Time waveform |
Frequency domain | Power spectrum, Fourier spectrum, 1/1 octave (bundled), 1/3 octave (bundled) |
Amplitude domain | Amplitude probability density function, amplitude probability distribution function |
Comparator Function
Judgment mode | Continuous mode, single mode |
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Judgment result output | Total judgment result, individual judgment result of up to 5 specified blocks or shapes |
Automatic data storage | Either NG or all measurement results |
Timer function | Start delay time setting, judgment execution time setting
0 to 255 seconds (Interval: 1 second) |
Block mode | |
Target waveform | Power spectrum, 1/1 octave (bundled), 1/3 octave (bundled), order spectrum |
Maximum number of setup blocks | 20 blocks |
Judgment method | Level, peak level, peak max (maximum value), inside max, partial overall, areal content rate
Judgment method can be specified for each block. |
Judgment criterion | NG for whole block, 1 block |
Shape mode (CF-0472 option) | |
Target waveform | Time waveform, power spectrum, 1/1 octave (bundled), 1/3 octave (bundled), order spectrum, tracking diagram |
Maximum number of setting shape lines | 20 lines |
Judgment criterion | Specified area, specified level |
Memory Function
Recording device | Selectable from internal storage of main unit, USB memory or SD/SDHC card |
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Data file | Number of storable data : 9990 (max.)
DAT, TXT, BMP, TRC (Data can be saved simultaneously in four formats. (Data storage in TXT, BMP, and TRC formats can be selected optionally.)) |
Panel condition memory | Memorizes and recalls measurement conditions. (50 types max.) |
Interface
USB | |
Number of ports | 2 USB 3.0 USB memory, keyboards, wireless LAN module* *Please refer to the recommended product. |
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SD card | |
Number of ports | 1 Supports SD/SDHC/SDXC capacity: 128 GB* *Please refer to the recommended product. |
LAN | |
Number of ports | 1 10BASE-T/100BASE-TX/1000BASE-T Remote desktop, external control, file sharing (internal storage) |
RS-232C | |
Number of ports | 1 |
Baud rate | 1,200 to 115,200 bps |
Digital I/O | |
Digital input | |
Number of input signals | 9 inputs and common (Insulation withstand voltage 42.4 Vpeak) |
Applicable connector | FK-MC 0,5/10-ST-2,5 |
Input function | Control by command assignment (max. 9 kinds)
Judgment block changeover (selectable 4 blocks) Panel condition selection (15 kinds) |
Status output | |
Number of output signals | 4 outputs are separated (Each signal is isolated, insulation withstand voltage 42.4 Vpeak) |
Applicable connector | FK-MC 0,5/8-ST-2,5 |
Output function | BUSY, OK, NG, ERR |
Comp output | |
Number of output signals | 5 outputs and common (Insulation withstand voltage 42.4 Vpeak) |
Applicable connector | FK-MC 0,5/6-ST-2,5 |
Output function | Individual judgment output (any 5 outputs) |
General Specifications
Power requirement | 16 VDC, 3.3 A |
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AC adapter | Power requirement: 100 to 240 VAC, 50/60 Hz Power consumption: 65 VA or less / 150 VA or less (When CF-0478A Power Source Backup Function is installed and charging battery) |
Operating temperature range | 0 to 40 °C (Humidity 20 to 80 %RH, with no condensation) |
Storage temperature range | -10 to +50 °C (Humidity 20 to 80 %RH, with no condensation) |
Outer dimensions | 220 (W) x 185 (H) x 220 (D) mm (Excluding handle, stand, and protruded section) |
Weight | Without option Approx. 2.8 kg
With options Approx. 3.3 kg (When CF-0473A Amplitude Modulation Component Extraction Function and CF-0478A Power Source Backup Function are installed, including battery pack) |
Main unit cooling | Naturally air cooling (Fanless) |
Conforming standards | CE marking |
Vibration resistance | 9.8 m/s2 (Frequency 10 to 150 Hz, in each of X, Y and Z direction) |
Shock resistance | 400 m/s2 (11 ms duration) |
Accessories |
·AC adapter x 1 (PS-P20023 + power cable (2 m)) ·Instruction manual x 1 ·CD-ROM x 1 (Reference guide, utility, etc.) ·SD card x 1 (Exclusive for updates, 512 MB) ·3 Connectors for terminal blocks ·Ferrite core x 1 (E04SR301334, made by SEIWA ELECTRIC MFG. CO.,LTD.) |
Optional Functions
CF-0473A Amplitude Modulation Component Extraction Function
(Band pass filter, Envelope and Monitor Function)
Analog filter |
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Headphone output |
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Accessory | Ferrite core x 1 (E04SR200932, made by SEIWA ELECTRIC MFG. CO.,LTD.) |
CF-0478A Power Source Backup Function
Battery | Lithium ion secondary battery mounted in main unit (detachable) |
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Battery Charging time that the Power Source Backup Function becomes available | Approx. 10 to 30 minutes (At battery level 0 %, surrounding temperature range +10 °C to +35 °C) The battery can be charged only when the main unit is on. |
Bttery replacing intervals | Approx. 2 years* ( The battery replacing intervals may be shorter than the above depending on the operating and storage conditions. ) |
Accessory | Battery x 1 |
Product Lineup
Model name | Product name |
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CF-4700A | FFT Comparator |
CF-0471 | Tracking Function |
CF-0472 | Shape Comparator Function |
CF-0473A | Amplitude Modulation Component Extraction Function (Band pass filter, Envelope and Monitor Function) |
CF-0478A | Power Source Backup Function |
CF-0470AJ | Reference guide (Japanese) |
CF-0470AE | Reference guide (English) |
Relationl information
Revised: 2023/09/12