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Measurement microphone 4939
condenserprepolarizeddynamic

measurement microphone
measurement microphone
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Characteristics

Applications
measurement
Technology
condenser, prepolarized, dynamic
Other characteristics
free-field, 1/4", frequency

Description

¼-INCH FREE-FIELD MICROPHONE, 4 HZ TO 100 KHZ, 200V POLARIZATION Designed for high-level and high-frequency measurements. Free-field ¼" microphone Type 4939 is specially designed for high-level and high-frequency measurements. By using stainless steel diaphragm and protection grid, the microphone is optimised to withstand rough environments and is capable of working at high temperatures up to 150°C (302°F). USE SCENARIOS High level measurements High frequency measurements Model work ROBUSTNESSThe microphone is capable of withstanding the IEC 68-2-32 1 metre drop test.CALIBRATIONThe sensitivity can be calibrated at 250 Hz by using Pistonphone Type 4228 with ¼" Adaptor DP 0775. The actuator response can be measured using Actuator UA 0033 with Adaptor DB 0264. The free-field response can be obtained by adding the type-specific, free-field correction to the actuator response. Specifications Capacitance 6.1 pF Diameter 1/4 Dynamic range 28 – 164 dB Frequency range 4 – 100000 Hz Inherent noise 28 dB A Lower limiting frequency -3dB 3 Hz Optimised Free field Polarization Ext polarized Polarization voltages 200 V

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