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TOPIC: Calibration of UMIK-1

Calibration of UMIK-1 1 year 2 months ago #39794

  • zeroxia
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I've bought a UMIK-1. It seems that the absolute SPL measuring is not accurate when using the sensitivity value from the downloaded calibration files.

First question, why is the diameter of the microphone slightly smaller than half inch? When placing the UMIK-1 into the B&K 4231 calibrator, it's not a tight fit.

The default senstivity value from the calibration file produces SPL of 96.4 dB, although the fit is not tight, the SPL value is still higher than 94 dB.

(You can view the calibration file in the background in the screenshot)

Then I changed the sensitivity value according to the B&K calibrator, the result is as follows:

And verify that with a handheld SPL meter:

So why is the default factory calibrated sensitivity has so big deviation?
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Calibration of UMIK-1 1 year 3 days ago #41010

I agree that the microphone does not fit any 1/2 inch calibrator and would like to know why. Unless it is sealed tightly calibration will not be accurate, so an elastic band can be used around the microphone to form a better seal with the calibrator. This is still not ideal.
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