Dynamic microphones M-87/AIC and M-101/AIC and earphone H-143/AIC
F. H. Reiff · NASA STI Repository (National Aeronautics and Space Administration)
The electrical characteristics of the M-87/AIC and M-101/AIC dynamic microphone and H-143 earphones were tested for the purpose of establishing the relative performance levels of units supplied by four vendors. The microphones and earphones were tested for frequency response, sensitivity, linearity, impedance and noise cancellation. Test results are presented and discussed.