<强>1/2"麦克风风，外部偏振
自由场麦克风，用于高精度Electroacoustic测量和需要3 Hz至40 kHz频率范围的普通声学。
TYPE 4191
4191-C-001 型专为需要宽带宽的高精度自由场测量而设计。
| ½-inch Free-field Microphone Type 4191 (bp2212) | Data Sheets | English |
| Standard | IEC 61672 |
| Sound field | Free field |
| Polarization voltage | 200V |
| Sensitivity | 12.5 mV/Pa |
| Lower limiting frequency | 3.15 Hz |
| Higher limiting frequency | 40 kHz |
| Inherent noise | 20 dB(A) |
| Upper limiting of dynamic range | 162 dB |
| Diameter | 1/2 inch |
| Venting | Side |
| Minimum Temperature | -30 °C |
| Maximum Temperature | 300 °C |
| Minimum Temperature | -22 °F |
| Maximum Temperature | 572 °F |
At higher frequencies reflections and diffractions causes a pressure increase in front of the diaphragm of a microphone. If not corrected for, this would result in an increased output voltage. A free-field optimisation means that the frequency response of the microphone has been designed in such a way that the free-field response at 0 degrees incidence is flat. This microphone is optimised for use with the protection grid in place.
Free-field microphones are commonly used for sound measurement in an anechoic chamber or far away from reflecting buildings, etc. Another area for free-field microphones is for general electroacoustic measurements like loudspeaker and microphone measurements.
With an upper frequency of 40 kHz, Type 4191 is especially suited all high-precision electroacoustic measurements as well as general acoustic measurements where a robust and stable free-field microphone is required. Despite the 40 kHz upper frequency, this microphone is optimised to operate with the protection grid in place.
A press-fitted, stainless-steel diaphragm ensures superior long-term stability and mechanical robustness – Type 4191 will withstand the 1 m drop test of IEC 60068-2-32.
Type 4191 requires an external polarization voltage and must therefore be used with a classical preamplifier. Externally polarized microphones may be used at higher temperatures without severe changes in sensitivity.
Type 4191 is available in TEDS combinations with the classical Microphone Preamplifier Type 2669. The TEDS microphone is considered one unit and has been sealed in a clean environment. The TEDS is programmed with the loaded sensitivity of the actual cartridge and the data is therefore readily available. The default TEDS template is to IEEE P 1451.4 but TEDS to IEEE 1451.4 is available on request.
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.
