1/4" FREE-FIELD MICROPHONE, EXTERNAL POLARIZED
Free-field microphone designed for high-level and high-frequency measurements over a frequency range of 4 Hz to 100 kHz.
TYPE 4939
Using stainless steel diaphragm and protection grid, Type 4939 Microphone is built to withstand rough environments and can be used in high-temperature measurements up to 150°C (302°F).
The microphone requires an external polarization voltage and must therefore be used with a classical preamplifier. Externally polarized microphones can be used at higher temperatures without severe changes in measurement sensitivity.
File |
Description |
Type |
Languages |
Size |
---|---|---|---|---|
4939 - Datasheet (bp1851) | ¼-inch Free-field Microphone Type 4939 Datasheet (bp1851) |
Technical Document | English | 438 KB |
Standard | IEC 61094 |
Sound field | Free field |
Polarization voltage | 200V |
Sensitivity [mV/Pa] | 4 mV/Pa |
Lower limiting frequency | 4 Hz |
Higher limiting frequency | 100 kHz |
Inherent noise | 28 dB(A) |
Upper limiting of dynamic range | 164 dB |
Diameter | 1/2 inch |
Venting | Side |
Minimum Temperature [°C] | -40 °C |
Maximum Temperature [°C] | 150 °C |
Minimum Temperature [°F] | -40 °F |
Maximum Temperature [°F] | 302 °F |
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.