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).
High level measurements
High frequency measurements
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.
28 – 164 dB
4 – 100000 Hz
28 dB A
Lower limiting frequency -3dB