The electret microphone, which is widely used in electrical appliances such as radio cassette recorders and telephones, directly affects the performance of voice transmission and recording. The sensitivity of this type of microphone can be easily tested with a multimeter.
Dial the multimeter to the R & TImes; 100 position, the two test leads are respectively connected to the two electrodes of the microphone (be careful not to be wrongly connected to the ground electrode of the microphone). Even), observe the swing amplitude of the hands while blowing air. At the moment of blowing, the greater the amplitude of the needle swing, the higher the microphone sensitivity, and the better the speech delivery and recording effects. If the swing amplitude is not large (fine movement) or does not swing at all, it means that this microphone has poor performance and should not be used.
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