Measurement microphone 4940

prepolarizedfrequencyoutdoor

Free-field microphone for outdoor and industrial environment measurements and frequency analysis measurements from 2 Hz to 20 kHz. Dyn. range : 14.6 – 146 dB Freq. range : 6.3 – 20000 Hz Polarization : Prepolarized Sensitivity : 50 mV/Pa Standards : IEC 60651 TYPE 1 Prepolarized Free-field ½-inch Microphone Type 4940 offers significant benefits when used with portable instruments. It is particularly suitable for both outdoor and industrial environment measurements. It is also suitable for IEC 60651 Type 1 measurements and frequency analysis measurements. USE SCENARIOS Sound level meters Noise measurements according to IEC and ANSI standards Transport noise measurements FEATURES Wide dynamic range from 14.6 dB(A) – 146 dB (3% distortion limit) Low ambient temperature coefficient IEC 60651 Type 1 approved with Modular Precision Sound Level Meter Type 2231 ROBUSTNESS The microphone is capable of withstanding the IEC 68 232 1 metre drop test. CALIBRATION OF SENSITIVITY AND FREQUENCY RESPONDS The sensitivity can be calibrated at 250 Hz using Pistonphone Type 4228 with ½-inch Adaptor DP 0776. The actuator response can be measured using Actuator UA 0033. The free-field response can be obtained by adding the type-specific, free-field corrections to the actuator response. Robustness: The microphone is capable of withstanding the IEC 68232 1 metre drop test. Ageing and Assembly: Ageing at high temperature and the assembly of the microphone in a clean room environment ensure that the microphone can be used in high humidity environments and still produce reliable results.