1/2′ Measuring Microphone Preamplifier — climate proof, because of controlled heating The 1/2” measuring microphone preamplifier type MV 205 is a high-impedance transducer for 1/2′ condenser measuring microphone capsules used in weatherproofed measuring microphone units. The MV 205 permits sound level measurements with a dynamic range from 11 dB up to 168 dB. The preamplifier has a low output impedance. This renders a good driver capability possible even for long cables. The preamplifier is equipped with a heating regulation preventing a possible condensation under extremely climatic conditions. The Adaptor A 63.1 allows 1” condenser measuring microphone capsules to be mounted on the 1/2” preamplifier and the Adaptor A 67 makes the same for the 1/4” condenser measuring microphone capsules possible. The thread of the preamplifier confirms to the international standard according to IEC 61094. The measuring microphone preamplifier MV 205 is designed for sound level meters of IEC Type 1 according to IEC 61672. The MV 205 can be optimally combined with the new MK 255 stainless steel capsule and the MN 921 power supply unit. The MK 255 is designed for research, development and industry, including building acoustics and audiometry. A fixed charge carrier layer (backelectret) provides the necessary polarization voltage. The constructive concept guarantees high temporal constancy of the electroacoustic parameters. The counter electrode (carrier of the electrets layer) is isolated from the housing by a quartz glass pane. The protective cap protects the membrane from mechanical damage.
Технические характеристики
CharacteristicsSecondary functionmeasuringOther characteristics1/2 microphoneVoltage
Max.: 130 V
Min.: 28 V
Frequency
Max.: 1,000,000 Hz
Min.: 1 Hz
