Unusual sound and vibration testing machine

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  • MV-20 / MV-20D

Motor vibrophonic monitor

MV-20 / MV-20D

A very small acoustic vibration during operation can indicate a major defect in a small-sized precision motor. The acoustic vibration is normally detected using a sounding bar applied to the ear of an inspector who judges whether to reject or pass a motor by listening to its sound during operation.
This method produces different judgments according to each individual inspector, and automation is not possible. With this unit, a highly sensitive acceleration-type detector is applied to the bearing area of a motor, to directly defect the acoustic vibration.
The resultant measurement is not influenced by environmental noise, and an absolute and accurate measurement can be made. Automatic judgment of whether to reject or pass a motor is also possible by incorporating an optional comparator.

Features

  • Detects vibration and bearing rumbling due to unbalance of motors, etc.
  • The measurement noise can be heard through loudspeakers and earphones.
  • The external communication function facilitates the introduction of the system into automated production lines.

Name of each unit

  1. Power Switch
  2. Volume
  3. Earphone Jack
  4. Sensor Input
  5. Range Setting Switch
  6. Frequency Band Setting Switch
  7. Comparator Setting Switch
  8. Comparator Level
  9. Comparator NG Lamp
  10. Speaker
  11. Analog Meter
  12. Handle

Sample Application( for MV-20D)

・FFT analysis and frequency response time conversion can be checked based on vibration waveform data.
・Libraries that can be easily programmed to acquire data via USB communication are available.


Specification

 MV-20 MV-20D
Frequency range 3selectable steps1.Full bandwidth 15Hz~10KHz
2.Low range 15Hz~1KHz
3.High range 1KHz~10KHz
Acceleration range measured 0.05G~10G(6 RANGE)
Output (external output) 100mWrms MAX.(at32Ω)
Frequency characteristics 20Hz~8KHz(±0.5dB) 15Hz~10KHz(±1.0dB)
Filter characteristics -12dB/oct
Operating temperature/humidity 0℃~40℃ / 10%~70%(No condensation)
Power source AC100V~AC240V 50/60Hz
Power consumption 5VA以下
Dimensions of main unit 200W×130H×150D
communication port I/O・RS-232C I/O・RS-232C・USB
AD Converter - Resolution16bit Memory1Mword
Acceleration Sensor
Detection Method Piezoelectric Acceleration
Charge Sensitivity 10pC/m/s2
Acceleration MAX. 10000m/s2
Resonant Frequency 20KHz Over
Temperature Humidity -10℃~80℃ / 0%~90%

MV-20

  • Frequency range
    3selectable steps1.Full bandwidth 15Hz~10KHz
    2.Low range 15Hz~1KHz
    3.High range 1KHz~10KHz
  • Acceleration range measured
    0.05G~10G(6 RANGE)
  • Output (external output)
    100mWrms MAX.(at32Ω)
  • Frequency characteristics
    20Hz~8KHz(±0.5dB) 15Hz~10KHz(±1.0dB)
  • Filter characteristics
    -12dB/oct
  • Operating temperature/humidity
    0℃~40℃ / 10%~70%(No condensation)
  • Power source
    AC100V~AC240V 50/60Hz
  • Power consumption
    5VA以下
  • Dimensions of main unit
    200W×130H×150D
  • communication port
    I/O・RS-232C
  • AD Converter
    -
  • Acceleration Sensor
  • Detection Method
    Piezoelectric Acceleration
  • Charge Sensitivity
    10pC/m/s2
  • Acceleration MAX.
    10000m/s2
  • Resonant Frequency
    20KHz Over
  • Temperature Humidity
    -10℃~80℃ / 0%~90%

MV-20D

  • Frequency range
    3selectable steps1.Full bandwidth 15Hz~10KHz
    2.Low range 15Hz~1KHz
    3.High range 1KHz~10KHz
  • Acceleration range measured
    0.05G~10G(6 RANGE)
  • Output (external output)
    100mWrms MAX.(at32Ω)
  • Frequency characteristics
    20Hz~8KHz(±0.5dB) 15Hz~10KHz(±1.0dB)
  • Filter characteristics
    -12dB/oct
  • Operating temperature/humidity
    0℃~40℃ / 10%~70%(No condensation)
  • Power source
    AC100V~AC240V 50/60Hz
  • Power consumption
    5VA以下
  • Dimensions of main unit
    200W×130H×150D
  • communication port
    I/O・RS-232C・USB
  • AD Converter
    Resolution16bit Memory1Mword
  • Acceleration Sensor
  • Detection Method
    Piezoelectric Acceleration
  • Charge Sensitivity
    10pC/m/s2
  • Acceleration MAX.
    10000m/s2
  • Resonant Frequency
    20KHz Over
  • Temperature Humidity
    -10℃~80℃ / 0%~90%