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Test of Head Telephone Receivers, Type CAU-49003 (Automatic Electric Company)
The receivers were tested to determine the following characteristics: (a) Compliance with specifications as to dimensions and materials. (b) Operation at high energy input (50 milliwatts). (c) Effect of mechanical shock. (d) D.C. resistance. (e) Impedance at the frequency of primary resonance. (f) Efficiency factor at the frequency of primary resonance. (g) Primary resonance frequency. (h) Magnitude of secondary resonance peak. (i) Band width of primary resonance peak. (j) Band width of secondary resonance peak. (k) Effect of humidity on sensitivity. (l) Effect of humidity on insulation resistance. (m) Effect of humidity on materials.
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