The calibrated MI19 microphone is suitable for all measurements in technical acoustics, for example for recording machine noise, sound measurements on test benches, use in impedance tubes, sound tests and use as an acoustic camera.
The IEPE microphones MI15, MI17, MI19, RG-50 and MI21 belong to the category of free-field microphones with integrated electronics and are frequently used in scientific research.
Of course, these microphones can also be supplied with tight tolerances of ±0.5 dB. The transmission factors are between 14 mV/Pa and 100 mV/Pa.
Coaxial cables are used as feed lines and the standard microphone configuration includes BNC connectors, which are also optionally available as TNC variants. The microphone can be used with any device that has an IEPE standard compatible supply.
In the following, I would like to present the self-noise of four microphone models, including two 1/2‘ microphones and two 1/4’ microphones.
Following microphones were used for the measurements:
Class 1 | in accordance with IEC 61672 |
|---|---|
Transducer type | Electrete pressure transducer |
Diameter | 1/4″ |
Polar pattern | Omni |
Frequency range | 20 Hz – 20 kHz |
Sensitivity @ 1 kHz | 50 mV/Pa ± 0.5 dB |
Max. SPL for 1% THD at 1 kHz | 130 dB Peak |
Inherent noise | 30 dB(A) |
Output impedance | <50 Ohm |
Current consumption | 2-6 mA |
Power supply | 18 V DC to 30 V DC |
Bias: | 12.5 Volt |
Temperature range, operation | -20°C to +80°C |
Heat resistant | up to 110 °C |
Diameter | 7 mm ± 0.05 mm |
Length | 83 mm 1/4″ sleeve diameter over the entire length |
Weight | 19 g |
Connector | BNC (fem.) |
IP55 splash water resistant
The 19SW microphone has been designed to be IP55 splash water resistant.
The microphone is therefore suitable for use in measurement campaigns in wet and damp weather conditions.
An IP55 water-repellent seal on the membrane at the sound inlet prevents potential damage to the electret capsule caused by water.
The IEPE microphone is suitable for use in standard industrial environments and for all noise measurements with a sound pressure level of up to 130 dB.
Calibration is possible with a commercially available microphone calibrator and a 1/2″ to 1/4″ adapter.
The MI19 microphones are equipped with a BNC socket so that standard BNC cables can be used.
A TNC plug version is also available on request.
