1/4" High Level Measurement Microphone Capsule The CEL-259 1/4" measuring microphone capsule is designed for specialized acoustical measurements such as high noise levels up to 165 dB that excede the usual 140 dB limit of traditional 1/2" microphones. The microphone capsule is primarily used as an alternative transducer for the CEL-630 series of noise analyzers. It can also be used with the CEL-400 series since it is a pre-polarized design and does not require the normal 200V bias supply. The extended frequency response and high upper limit make the CEL-259 suitable for the investigation of impulsive or impact acoustic signals. Includes 1/4" to 1/2" preamplifier adaptor individual calibration certificate Features industry standard 0.25 inch size free field response 4.0 mV/Pa sensitivity -48 dB re 1 V/Pa frequency response from 4Hz-70kHz measurement of high sound levels up to 165 dB rms. (168 dB peak) with CEL-600 or 400 real time analyzers does not require 200 Vdc power supply each microphone capsule is supplied with an individual frequency response calibration chart and pre- amplifier adaptor nickel diaphragm rear vented design
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