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 4939 1/4"

4939 1/4"

4939 - ¼” free-field microphone, 4 Hz to 100 kHz, 200V polarization

Overview:


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).

Uses
• High level measurements
• High frequency measurements
• Model work

Features
• Sensitivity: 4 mV/Pa
• Frequency: 4 – 100,000 Hz
• Dynamic range: 28 – 164 dB
• Temperature: – 40 to 150°C (–40 to 302°F)
• Polarization: 200 V External

Robustness
The microphone is capable of withstanding the IEC 68-2-32 1 metre drop test.
Assembly
The assembly of the microphone in a clean room environment ensures that the microphone can be used in high humidity environments and still produce reliable results.
Calibration
The 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.
 

4939 1/4"

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