Instruction Manual

Sound Level Meter Types 2245 – Instruction Manual Page 76 of 110
Diffuse-field Frequency Responses
Diffuse-field frequency responses with Z frequency weighting. Measured with sounds
at random incidence and the sound level meter’s Sound field set to Diffuse-field , see
section 4.6.
Table A. 4 Diffuse-field frequency response for the sound level meter
Nominal
Frequency
Exact
Frequency
(6 digits)
Microphone
Diffuse-field
Response
Electrical
Response
Acoustical
Response
Expanded
Uncertainty
Hz Hz dB dB dB dB
63 63.0957 0.03 0.04 0.07 0.07
80 79.4328 0.02 0.04 0.06 0.07
100 100.000 0.02 0.04 0.06 0.07
125 125.893 0.01 0.04 0.05 0.07
160 158.489 0.00 0.04 0.04 0.07
200 199.526 -0.01 0.05 0.04 0.07
250 251.189 -0.02 0.05 0.03 0.07
315 316.228 -0.03 0.05 0.02 0.07
400 398.107 -0.03 0.05 0.02 0.07
500 501.187 -0.04 0.06 0.02 0.08
630 630.957 -0.06 0.07 0.01 0.09
800 794.328 -0.07 0.09 0.02 0.10
1000 1000.00 -0.10 0.11 0.01 0.10
1060 1059.25 -0.12 0.12 0.00 0.11
1120 1122.02 -0.14 0.13 -0.01 0.11
1180 1188.50 -0.16 0.14 -0.02 0.11
1250 1258.93 -0.18 0.16 -0.02 0.11
1320 1333.52 -0.21 0.17 -0.04 0.11
1400 1412.54 -0.22 0.19 -0.03 0.11
1500 1496.24 -0.25 0.21 -0.04 0.11
1600 1584.89 -0.28 0.23 -0.05 0.12
1700 1678.80 -0.31 0.25 -0.06 0.12
1800 1778.28 -0.34 0.28 -0.06 0.12
1900 1883.65 -0.37 0.31 -0.06 0.12
2000 1995.26 -0.40 0.34 -0.06 0.12
2120 2113.49 -0.43 0.37 -0.06 0.12
2240 2238.72 -0.48 0.41 -0.07 0.13
2360 2371.37 -0.51 0.46 -0.05 0.13
2500 2511.89 -0.55 0.51 -0.04 0.13
2650 2660.73 -0.59 0.56 -0.03 0.13
2800 2818.38 -0.65 0.62 -0.03 0.13
3000 2985.38 -0.71 0.68 -0.03 0.13
3150 3162.28 -0.77 0.75 -0.02 0.13
3350 3349.65 -0.83 0.83 0.00 0.14
3550 3548.13 -0.91 0.91 0.00 0.14