- BrandEFT Sensing System
- Country of manufactureChina
- Microphone typeCondenser
Electret condenser microphones of the CHZ series represent high-quality condenser microphones with pretsizionno exact internal polarization. These microphones are the last achievement of the BAST company in the field of manufacturing techniques of microphones. Microphones of the CHZ series possess the uniform frequency characteristic during the work in severe climatic conditions, at high temperature and humidity. Besides, microphones of the CHZ series have high long-term stability and low temperature coefficient. Electret material of the microphone turns out by means of special process of polarization with high temperature. Each microphone cap is exposed to artificial aging at the high/low temperature and high humidity that provides good long-term stability. The microphone membrane made of nickel on special technology ideally is combined with a cap that allows to reach high mechanical stability. The case of the microphone and its plate of the basis are executed from alloy K-monel representing a nickel alloy with high resistance to corrosion and low coefficient of thermal expansion.
The preamplifier of the YG series has the high entrance resistance, high dynamic range, low noise level, small consumption and high extent of coordination of phases between channels.
Food of a preamplifier can be two types: from a source of a direct current 4 ma and from a source of constant tension. A direct current it is simpler to organize and put food into practice since it is provided by payments of data collection and other equipment having special interfaces for acoustic sensors. The signal is given by means of a coaxial cable with the good screen version from electromagnetic hindrances that allows to transfer him to long distances. Such cables have bayonetny sockets on both ends and provide losses by transfer less than 0,1 dB in the range of signal up to 1 kHz.
In a microphone lattice of ZL — 301/302 the electret microphones 1/2 of inch possessing very good coordination on a phase and long-term stability are used. They have the following characteristics: high sensitivity, low noise level, wide frequency range, stability and good resistance to influence of environment, lack of power supply. These microphones are suitable for acoustic lattices and for acoustic detection. Low-temperature aging and the protection against moisture allowing to use them in conditions both with high and with low humidity, allow to use microphones out of rooms and guaranteeing very high stability of a phase.
The microphone lattice of ZL — 302 with a possibility of adjustment of a phase in the field of low frequencies possesses good coherence of phases at a low frequency and is suitable for low-frequency measurements of a sound.