At the BNC output connector you get a voltage proportional to the sound pressure independent of the amplification of the headphone amplifier. So the instrument can be used as a front end for analyzers or similar instruments.

The AV11 has been constructed for mobile uses.

AV11 offers you many possibilities to locate disturbance sources. It comes with a permanently mounted 120mm swan-neck and directional Microphone.

The measuring signal can be weighted with the switchable octave filter (9 frequencies) or third octave filter (25 frequencies).

So you can detect the exact frequencies
of the disturbance source.