Quote:
Originally Posted by andrebrito  Ethan
I was talking about making the measurements on the same and exact location with the same sound source and sound level meter.
You get different results. Differences are quite significant when the room is reverberant. |
Folks,
ASTM C423 notes the following in their publication for testing in reverberation chambers:
Quote:
6. Interferences
6.1 Changes in temperature and relative humidity during the course of a measurement may have a large effect on the decay rate, especially at high frequencies and at low relative humidities. The effects are described quantitatively in ANSI S1.26. These effects due to temperature and relative humidity changes
can be accounted for by the procedure in 6.2.
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I've seen this - with some huge swings taking place just due to humidity when everything else is exactly the same as a previous test.
Rod