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Entry  Sat Aug 18 19:29:56 2012, Den, Update, PEM, EM 172 microphones noise  em172.png
    Reply  Mon Dec 3 16:37:09 2012, Steve, Update, PEM, EM 172 microphones ordered 
Message ID: 7777     Entry time: Mon Dec 3 16:37:09 2012     In reply to: 7226
Author: Steve 
Type: Update 
Category: PEM 
Subject: EM 172 microphones ordered 


I've put EM 172 microphones inside Steve's isolation box to measure their noise. I've attached mics to each other and aligned them using the tape.

At low frequencies (below 1 Hz) the noise is limited by ADC as there is a 10 Hz high-pass filter inside mic readout box.

ADC noise is measured by splitting the signal from 1 mic into 2 ADC channels.


 BT EM172 microphones  are ordered.

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