Soundlevel Meter

A sound-level meter includes a microphone, an amplifier, an attenuator, and an indicating meter. The stability of these four elements determines the overall calibration stability of the instrument, so it is important that they hold their initial, factory-calibrated characteristics over long periods of time in field use. Since the attenuators and recti fier-type indicating meters used give very little difficulty at their present stage of development, this discussion deals mainly with the amplifier and the microphone.

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