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3.
Application
Automatic Recording of Harmonics in
Earphon,
e s.
By using the Artificial Ear Type 4152 together with an oscillator with a low
distortion, such as the B & K Beat Frequency Oscillator Type 1022, and the
Audio Frequency Spectrometer 2112, an equipment is obtained for measuring
harmonics produced in earphones. If the spectrometer and the B.F.O. are
combined with the B
&
K Level Recorder Type 2305 (as in the A.F. Response
'('63753
Fig. 3.1. Measuring arrangement for automatically measuring frequency
characteristics and harmonic distortion of earphones.
17
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