ECM microphone test

ECM microphone test

The electret microphone consists of two parts: acoustic-electric conversion and impedance conversion. The key component of acoustic-electric conversion is the electret diaphragm. It is a very thin plastic film with a thin metal film evaporated on one side. Then, after passing through the high-voltage electric field electret, the charges of different polarity reside on both sides. The gold-evaporated side of the diaphragm faces outward and communicates with the metal shell. In the electret microphone, there is a field effect tube for preamplification, so the electret microphone needs a certain bias voltage during normal operation. CRY6151B Electroacoustic Analyzer supports multi-channel microphone synchronous acquisition test. The test items include parameters, such as sensitivity, distortion, SNR, and current. It can meet the requirements for laboratory testing and increase production capacity in many aspects.

  • High productivity
  • Supporting multi-channel automation
  • Flexible solution customization
Solution introduction

  • Connect the MIC under test to CRY6151B DUT MIC input port.

  • CRY6151B outputs audio through the MOUTH1 port to make CRY609 Mouth Simulator sound.

  • DUT MIC acquires sounds.

  • Input into CRY6151B analyzer for analysis

Test parameters

ECM microphone test

Frequency Response (FR)

Total Harmonic Distortion (THD)

Microphone current



Sending loudness



Configuration list
CRY6151B Electroacoustic tester X1 Standard Details
CRY609 Mouth Simulator X1 Standard Details
CRY333 Measurement Microphone X1 Standard Details
CRY507 Preamplifier X1 Standard Details
Test cable X1 Standard Details
CRY5611 Sound level calibrator X1 *Optional* Details
PC X1 *Optional* Details
Customized fixture X1 *Optional* Details
Full-automatic turntable X1 *Optional* Details