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フリーフィールド

Free-field microphones are typically used to measure loudspeakers or outdoor sound.

In order to make measurements in a free-field, totally without reflecting objects, the measurements must be made outdoors at the top of a flagpole (or equivalent) or in an anechoic chamber.

In an anechoic chamber the ceiling, floor and all the walls are covered by a highly absorptive material which eliminates reflections. Thus, the sound pressure level in any given direction from the noise source may be measured without the presence of interfering reflections. 

Type 4188-A-021

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Type 4188-L-001 is designed for free-field measurements where an economy microphone with medium sensitivity is required.

USE SCENARIOS

  • Medium class sound level meters
  • Equipment complying with IEC 61672 class 1
  • Random-incidence measurements
  • Portable sound measuring equipment

THIS MICROPHONE SET IS A COMBINATION OF:

  • Microphone Type 4188
  • Preamplifier Type 2669-L

The unit is assembled in a clean-room environment and sealed together, after which it is assigned one single type number and one single serial number. This means that the combined unit has better precision and long-time stability, and is handled as one complete unit.

The unit also contains TEDS, which means that information about the serial number, type and sensitivity is stored within it.

THE BENEFITS OF USING A MICROPHONE-PREAMPLIFIER COMBINATION ARE:

  • Better stability and precision. Because the unit is assembled in clean-room facilities, there is no contamination.
  • Ease of use. Your analyzer front-end and software will automatically detect the type number, serial number and sensitivity because of the built-in TEDS technology. There is no need to enter this manually for every channel. 
  • Calibration integration. The TEDS technology means the microphone is automatically detected and identified by your data acquisition software, allowing it to be easily integrated with your calibration database.
  • Fewer errors. As your data acquisition software automatically knows the microphone type, serial number and sensitivity, manual inputs are greatly reduced – reducing human errors.