User manual

314
Appendix
Frequency Response Corrections at 250 - 20000 Hz
(Refer IEC61672-1 paragraphs 5.2.4, 5.2.5, 5.2.6 und 9.2.4d)
Corrections below 250 Hz are 0.0 dB. No corrections apply for the typical effects of reflections from the case of the sound level
meter and diffraction of sound around the microphone.
The listed uncertainty applies for all here listed measurements and corrections. Its calculated for a level of confidence of 95% with
a coverage factor k=2. It represents the maximum permitted expanded uncertainty in accordance with IEC 62585.
Nominal
Frequency
Actual
Frequency
0° Free-field
Frequency Response
0° Free-field
Correction
Impact of
50 mm Wind Screen
0° Free-field Correction
with Wind Screen
Impact of
90 mm Wind Screen
Measurement
Uncertainty
Hz Hz dB dB dB dB dB dB
250 251.19 0.0 0.0 0.0 0.0 0,0 0.20
315 316.23 -0.1 0.1 0.0 0.1 0,0 0.20
400 398.11 0.0 0.0 0.0 0.0 0,1 0.20
500 501.19 0.0 0.0 0.0 0.0 0,1 0.20
630 630.96 0.1 -0.1 0.0 -0.1 0,1 0.20
800 794.33 0.0 0.0 0.0 0.0 0,2 0.20
1000 1000.00 0.0 0.0 0.0 0.0 0,2 0.20
1060 1059.25 0.0 0.0 0.0 0.0 0,2 0.20
1120 1122.02 0.0 0.0 0.1 -0.1 0,2 0.20
1180 1188.50 0.1 -0.1 0.1 -0.2 0,2 0.20
1250 1258.93 0.1 -0.1 0.1 -0.2 0,2 0.20
1320 1333.52 0.1 -0.1 0.1 -0.2 0,2 0.20
1400 1412.54 0.1 -0.1 0.1 -0.2 0,2 0.20