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■ 1/2 inch 8Hz to 12.5kHz biased polar freedom Micro hon The 4188 type is designed for measurement in the free sound field that requires a medium sensitivity with moderate sensitivity. Because it is a bias, it can be used in both CCLD and conventional preamplifiers. ■ Usage examples ・ Intermediate class sound level meter (noise meter) ・ Measurement according to IEC 61672 class 1 ・ Random incision measurement ・ Pable -type acoustic measurement device ・ Because of the uneven polar type, the 4188 type is suitable for battery -driven measurement devices and in a high -humid environment. ■ Use of free sound field type microphones In high frequency, the sound pressure in front of the microphone diaphragm increases due to the effects of reflection and diffraction. If the sensitivity is not corrected, the output voltage will increase as a result. 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 4188 type is optimized for the characteristics of the protective grid. 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. The 4188 type is suitable for combining with the IEC 61672 class 1 sound level meter. In addition, a general sound measurement that requires a durable and stable free sound field microphone is suitable when the upper limit frequency is 12.5 kHz enough. By using a DZ-9566 type random incident correction device, it can also be used for random incision measurement according to the ANSI standard. ■ stability Type 4188 is a press -processed stainless steel diaphragm and a back plate attached in a special way, making it a particularly sturdy micro -hon that does not sacrifice long -term stability. Type 4188 can withstand IEC 60068-2-32 1m fall test. ■ TEDS Micro Hon TEDS can be used for both CCLD or conventional preamplifier for the 4188 type. TEDS microphone is considered a single unit and is sealed in a clean environment. TEDS has the actual load on the actual cartridge, so you can use the data immediately. The default TEDS template is IEEE P1451.4, but IEEE 1451.4 can be used by request.
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