A laboratory standard microphone must provide dependable calibration stability, satisfactory performance, and reliability. The rugged construction of the Kellog microphone and a spring-loaded rear electrode assembly are intended to maintain constant diaphragm tension for improved stability. Appropriate modifications of the acoustic controls provide either a pressure-type or a free-field type of microphone. Each microphone has uniform characteristics and meets the ASA performance requirements for its type. Supporting performance data and other information relative to condenser microphones are presented.
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