Freifeld

Freifeldmikrofone werden typischerweise zur Messung von Lautsprechern oder Außengeräuschen verwendet.

Um Messungen im Freifeld ohne reflektierende Objekte durchführen zu können, müssen die Messungen im Freien an der Spitze eines Fahnenmastes (oder eines gleichwertigen Objekts) oder in einer reflexionsarmen Kammer durchgeführt werden.

In einer reflexionsarmen Kammer sind Decke, Boden und alle Wände mit einem stark absorbierenden Material bedeckt, das Reflexionen verhindert. Somit kann der Schalldruckpegel in einer beliebigen Richtung von der Schallquelle aus gemessen werden, ohne dass störende Reflexionen auftreten.

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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.

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