1/4" FREE-FIELD MICROPHONE, EXT. 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.
| Code | 感度 |
|---|---|
| -4939-A-011- | 4 mV/Pa |
| -4939-C-002- | 3.5 mV/Pa |
| -4939-L-002- | 3.5 mV/Pa |
| TEDS Microphones | Data Sheets | English |
| TEDS Microphones | Data Sheets | Japanese |
| Standard | IEC 61094 |
| Sound field | Free field |
| Polarization | Classical |
| Sensitivity | 3.5 mV/Pa, 4 mV/Pa |
| Lower frequency | 4 Hz |
| Higher frequency | 100 kHz |
| Lower dynamic range | 35 dB |
| Higher dynamic range | 164 dB |
| Diameter | 1/4 inch |
| Venting | Side |
| Minimum Temperature | -20 °C |
| Maximum Temperature | 80 °C |
| Minimum Temperature | -4 °F |
| Maximum Temperature | 176 °F |
| Output signal (connectivity) | Passive |
The unit is assembled in a clean-room environment and sealed together, after which it is assigned one single type number and one single serial number. This means that the combined unit has better precision and long-time stability, and is handled as one complete unit.
The unit also contains TEDS, which means that information about the serial number, type and sensitivity is stored within it.
