Casella 1/4" Pre Polarized Precision Measurement Microphone Free Field with 1/2" Adaptor

CEL-302-2 1/4" Pre Polarized Precision Measurement Microphone Free Field with 1/2" Adaptor by Casella

The CEL-302 1/4” measuring microphone capsule is designed for specialized acoustical measurements such as high noise levels exceeding the usual 140 dB limit of traditional ½” microphones.

The microphone capsule is used as an accessory transducer for the CEL-553, 573 & 593 - series of noise meters and real time analyzers.

The extended frequency response and high upper limit make the CEL-302 suitable for the investigation of impulsive signals.

Key Benefits

• industry standard 0.25 inch size
• free field response
• 3.5 mV/Pa sensitivity
• -49 dB re 1 V/Pa
• frequency response from 5Hz-60kHz
• measurement of high sound levels up to 165 dB rms. with CEL-500 real time analyzers
• requires 200 Vdc power supply
• each microphone capsule is supplied with an individual frequency response calibration chart and preamplifier adaptor
• nickel diaphragm
• side vented design

Applications

This ¼” microphone capsule is a high quality transducer that can be used on many popular CEL sound level meters and real time analyzers including the CEL-500 series instruments.

It features a free field frequency response to satisfy the requirements of IEC and other international sound level meter standards.

The microphone requires a 200 Vdc polarization supply and can therefore be used with any sound level meter or measurement system that provides such a bias voltage.

The capsule is supplied with an A67 ¼” to ½” adaptor to allow it to be fitted on the end of standard 1/2 inch instrument preamplifiers.

The lower microphone sensitivity of nominally 3.5 mV/Pa enables the sound level meter to measure sound levels up to a maximum of 165 dB rms (168 dB peak).

This makes it suitable for high level monitoring of transient phenomenon such as gunfire or other very impulsive sources where the peak level may reach up to 170 dB.