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Thread: Test equipment (reference-standard microphones)

  1. #1
    Join Date
    Jan 2006
    South of England, UK

    Default Test equipment (reference-standard microphones)

    As I mentioned recently, we have recently invested several thousand dollars in new test equipment. Although Bruel & Kjaer has always been at the heart of our test set, we have not had the luxury of duplication across the various sites that I may need to measure speakers: on the production line, in the test bunker (for grading drive units), at the Old Dairy (open space for measuing) or The Stable (mini deadroom) or at home. I have made do with 'clone' amateur test equipment - especially microphones, and that has introduced a degree of uncertainly which has wasted valuable time.

    So, back to B&K, the best, the most accurate, with traceable standards and a very long life. For example, here is the actual curve (also supplied as a mini-CD) for the best of the new microphone capsules we have just purchased from B&K Denmark

    As you can see from the curve below the yellow zone reresents +/- 1dB, and this specimen deviates from perfectly flat by a maximum of only about 0.5dB at the very highest frequencies and is, for all practical purpsoses, perfect. Bigger picture here:

    An accurate microphone, a reliable and known acoustic space - even if not a perfelcty relection free one, and a flat amplifier (another sad story) are paramount should you wish to design quality speaker systems.

    We now meet our ISO9001 obligations in this important area.
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    Alan A. Shaw
    Designer, owner
    Harbeth Audio UK

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