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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

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What is the difference between a PCB® array microphone and PCB’s 377B02 microphone? Both models 130E20 & 377B02 appear to be free-field ICP® microphones with BNC connectors.

PCB® model 130E20 is a value-oriented microphone sold for array applications or for customers who want a quality microphone but can’t justify the purchase of an IEC 61094-4 working standard microphone. When compared to a working standard microphone, model 130E20 has a narrower frequency capability and higher noise floor. They are well-suited for trending, performing general frequency and amplitude testing, but are more sensitive to changes in temperature and humidity. They offer a cost effective alternative to the 377 series. The 377B02 is capable of being used in Class 1sound level meter systems. The IEC 61094-4 standard was created so that users can be assured of the shape, size and quality specifications of a microphone used in a test and measurement system. The IEC 61072 (Class 1) is a system standard, as used with Sound Level Meters. A 377B02 is designed to output sound pressure levels very accurately and consistently. It is very stable over a wide range of environmental conditions and is very linear over a wide frequency range. 

What is the difference between a PCB® array microphone and PCB’s 377B02 microphone? Both models 130E20 & 377B02 appear to be free-field ICP® microphones with BNC connectors.

PCB® model 130E20 is a value-oriented microphone sold for array applications or for customers who want a quality microphone but can’t justify the purchase of an IEC 61094-4 working standard microphone. When compared to a working standard microphone, model 130E20 has a narrower frequency capability and higher noise floor. They are well-suited for trending, performing general frequency and amplitude testing, but are more sensitive to changes in temperature and humidity. They offer a cost effective alternative to the 377 series. The 377B02 is capable of being used in Class 1sound level meter systems. The IEC 61094-4 standard was created so that users can be assured of the shape, size and quality specifications of a microphone used in a test and measurement system. The IEC 61072 (Class 1) is a system standard, as used with Sound Level Meters. A 377B02 is designed to output sound pressure levels very accurately and consistently. It is very stable over a wide range of environmental conditions and is very linear over a wide frequency range.