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■ 1/2 inches 3.15Hz to 40kHz external biased freedom Micro Hon The 4191 type is designed for measuring high -precision free sound fields with a wide bandwidth. Since the 4191 type is an external polar type, it must be used in combination with the conventional preamplifier. ■ Usage examples ・ High -precision acoustic measurement up to 40kHz ・ Use in high quality sound level meters ・ IEC 61672 Equipment based on Class 1 ■ Use of free sound field type microphones In high frequencies, the sound pressure in front of the microphone diaphragm increases due to the effects of reflection and diffraction. If the sensitivity is not corrected, this effect will increase the output voltage. The free sound field optimization means designing the frequency characteristics of the microphone so that the free sound field response at 0 degrees is flattened. The 4191 type has the characteristics of the state with the protective grid is optimized. The free sound field type micro hon is commonly used in a position far from the iconic chamber or a reflector. In addition, it is used in general electrical sound measurement, such as measurement of speakers and microphones. Since the 4191 type is 40 kHz, the upper limit frequency is 40 kHz, so it is particularly suitable for high -precision electrical sound measurement, as well as a general acoustic measurement required for a sturdy, stable free sound field type microphone. Despite the upper limit frequency is 40kHz, this microphone has a characteristic of the protective grid. ■ stability A pressed stainless steel diaphragm guarantees long -term stability and mechanical robustness. The 4191 type can withstand the 1m drop test of IEC 60068-2-32. ■ Union -poles Since the 4191 type requires external polygophy, it must be used in combination with conventional preamplifiers. External molded microphone does not change significantly even at high temperatures. The 4191 type can use TEDS when combined with the conventional 2669 preamplifier. TEDS microphone is considered a single unit and is sealed in a clean environment. TEDS is programmed by the actual cartridge, so you can use data immediately. The default TEDS template is IEEE P1451.4, but IEEE 1451.4 can be used by request.
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4191Handling Company
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