4/26/2023 0 Comments Darkwood digital level meter![]() Note the snug fit now achieved between emm6 and ND9Įmm6 properly sealed into ND9 cavity. Be very careful to keep adhesives from contaminating the microphone calibrator cavity. ![]() ![]() A post-it note could be used as an alternative with only a minor degradation in result obtained. This strip of gaffer tape is approximately 6 to 7 cm in length. Measurement is 97.12 dB when it should be 93.98:Ī shim will be improvised to fit the Dayton emm6 properly into the ND9. ![]() From the examples above Dayton's emm6 is 0.10 inch small and a typical 6 mm mic capsule is going to need an adapter.ĪCO Pacific 7046 properly inserted into ND9 calibration cavity:ĭayton emm6 has a loose fit to ND9 calibration cavity: Without a proper fit into the calibrator cavity resulting sound pressure experienced by the microphone may easily be 3 dB or more in error. Inches - outside diameter of microphone tip:Ġ.236 - typical 6 mm omni capsule from digikey Less expensive mics do not adhere to the dimensional precision. Professional and laboratory equipment have precise specifications for measurement microphone dimensions ensuring this interface is maintained properly. Obtaining accurate results using a microphone calibrator requires a controlled interface between the measurement microphone tip and calibrator cavity.
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