limits??

does any one have details of how they test the dB at track days. I can get a sound level meter from Uni but need details of distance, rev range etc etc. I have read it is either 0.5 or 1m away at a 45 degree angle and 2/3 or 3/4 max revs, so i guess 7 or 8000 rpm for us but this tends to be...