| 摘要 |
A vibration and acoustic sound diagnostic instrument for use by a professional automotive maintenance mechanic which is capable of discriminating audible vibration sound and noise generated by under-chassis and under-hood parts and devices having mechanical faults. The instrument includes at least one acoustic vibration pick-up device adapted for mounting in contact with an automotive part or device for detecting and converting vibratory acoustic signals and sounds into electromagnetic signals and an electronics housing conformed to be held in the hand of the maintenance mechanic. Pre-amplifier circuitry within the housing is electrically coupled to the acoustic vibration pick-up device and to range selector circuitry for selecting sound level ranges respecting the electromagnetic signals. A decibel meter, mounted to the exterior of the housing, is electrically interconnected to the pre-amplifier for visually indicating changes and peaks in the sound levels detected by the transducer microphone. Operational audio amplifier circuitry within the housing is electrically interconnected to the pre-amplifier circuitry for converting the electromagnetic signals into secondary acoustic signals that may be listened to by the maintenance mechanic through an earphone headset electrically interconnected to the audio amplifier. The instrument is energized by a battery power supply contained within the housing.
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