1. Overview
  2. Technology
  3. Features
  4. Understanding Microphone Specs
    1. Definitions & Abbreviations
    2. Decibel - How loud is loud!
    3. EMC compliance
    4. Freefield vs Diffusefield
    5. Frequency Response
    6. Large vs Small Signal Performance
    7. Load Impedance
    8. Microphone Classification
    9. Microphone Sensitivity
    10. Phantom Power
    11. Polar Pattern
    12. Principle of Operation
    13. Sound Pressure Level and Clipping Distortion
  5. Specs
  6. Applications
  7. Associated Equipment
  8. Microphone Calibration
  9. Accessories
  10. Order Information
  11. Product Registration
  12. HIGH PERFORMANCE WARNING
  13. Safety Clause
  14. Limited Warranty
  15. Installation & Use
  16. Maintenance
  17. Electronic Waste
  18. Disclaimer
  19. Correction Directory

EMC compliance

 

Measurement microphones and electromagnetic compatibility - no "book with seven seals".

When it comes to EMC nose compliance testing the first question is, what standard is applicable for your measurement microphone?

In our understanding neither the EN55035 Multimedia Standard nor the EN IEC 60268-4 sound system equipment – microphones is not the right choice.

While are talking not only about a microphone but a "Measurement Microphone" we got told what standard to use simply by the name interpretation.

The EN IEC 61326-1 Electrical equipment for measurement, control and laboratory use – EMC requirements is the right one to be fullfilled.

Unfortunately we cannot find well defined  pass/fail criteria in there so why not dig deeper into standards and find the SPL meter standard.The EN IEC 61326-1 is helpful when we say the measurement microphone is used for system setup solely, but how’s about SPL monitoring?
The microphone is used as a pseudo SPL meter together with an audio interface and software. Should it meet or being close to the SPL meter standard?
If so, why not use the well defined "criterion A" from the SPL meter standard. It also tells us about the class 1 and class 2 pass/fail criteria.

 

Criterion A: The device must continue to work as intended without intervention by the operator. An impairment of the function or the operating behavior or a change in the operating status below an operating quality specified by the manufacturer or a functional failure is not permitted. Operational quality may be replaced by a loss of operational quality. If the minimum operating quality or the allowable loss of operating quality is not specified by the manufacturer, either of these two statements may be derived from the product description and the product documentation and from what the user can reasonably expect from the device or facility under normal use.

 

Please find the differences between measurement equipment and multimedia standard as follows:

 

iSEMcon products are developed focusing on the latest product and measurement equipment standards.