Log In

Log In

Need an Account? Start Here

 

Microphones and Acoustics

Frequently Asked Questions

Get your most commonly asked acoustics questions answered.

Section I: Definitions and Terminology
Section II: Microphone Recommendations
Section III: Calibration and Testing
Section IV: Specification Clarifications
Section V: Specialty Microphone Applications
Section VI: Maintenance and Handling

If you don’t see the answer to your question, call our 24/7 SensorLineSM 716-684-0001 to speak with an application engineer or visit Ask the Acoustics Experts.

Does increased sound pressure cause a positive or negative voltage at the output terminal?

When the incident pressure is positive on a prepolarized microphone, the voltage output should be positive.  Externally polarized microphones are 180 degrees out of phase with prepolarized microphones due to where the charge is stored.  On an externally polarized microphone the voltage output will be negative when the incident pressure is positive.

Does increased sound pressure cause a positive or negative voltage at the output terminal?

When the incident pressure is positive on a prepolarized microphone, the voltage output should be positive.  Externally polarized microphones are 180 degrees out of phase with prepolarized microphones due to where the charge is stored.  On an externally polarized microphone the voltage output will be negative when the incident pressure is positive.