MV-90 Motor Vibrophonic Monitor  FEATURES HOW DOES THE MV-90 WORK? The operator can attach the MV-90's highly sensitive acceleration-type detector to the bearing area or the housing of the motor directly.  The detector then catches the rumbling noise as vibration.  Simultaneously, the meter on the unit indicates the amount of the vibration.  In this case, the operator can listen to the rumbling noise from the speaker while the measurement is not influenced by its environment noise.  Automatic evaluation of OK/NG results is also possible with the optional comparator.   SPECIFICATIONS Frequency Range: 3 Selectable Steps     1. Full bandwidth: 15Hz - 10KHz 2. Low range:      15 Hz - 1KHz 3. High range:      1KHz - 10KHz Acceleration Range Measured 0.05G - 10G: 6 ranges Output (External Output) Max 150mWrms (at 4 Ohms) Frequency Characteristics 20Hz - 8KHz (±0.5 dB) 15Hz - 10KHz (±1.0 dB) Filter Characteristics -12dB/oct Operating Temperature and Humidity 0°C - 60°C, 30% -90% Power Source AC voltage upon your request Power Consumption Max 70VA Dimensions (mm) 200 (W) x 130 (H) x 150 (D)   Vibration Detector VT-5100 Detection Method Piezoelectric acceleration type Electric Charge Sensitivity Approx 100pC/ (m/S²) Resonant Frequency Min 20 kHz Operating Temperature and Humidity -10°C - 80°C, 0%-90%