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Hand-held Analyzer Type 2250
Instruction Manual
24
Fig.4.8 Free-field frequency response of Hand-held Analyzer Type 2250 (including Microphone Type 4189),
Windscreen UA 1650 fitted and sound field at 0
°
angle of incidence to the microphone. Sound Field
Correction parameter set to ‘Free-field’ and the Windscreen Correction parameter set to ‘Auto Detect’ or
‘UA 1650’, see Table A.5.
Fig.4.9 Free-field frequency response of Microphone Type 4189, with sound field at 0
°
angle of incidence to the
microphone and Outdoor Microphone Kit UA 1404 fitted. Sound Field Correction parameter set to ‘Free-
field’ and the Windscreen Correction parameter set to ‘UA1404’. See Table A.6. Reduced IEC 61672–1
limits are also drawn on the graph.
4.6.5 Diffuse-field Frequency Responses
The Diffuse-field frequency responses (also called random-incidence frequency responses) with Z-
frequency-weighting are provided in Fig.4.10 to Fig.4.12.
-4
-2
0
2
4
dB
100 1000 10000
Hz
040168
-4
-2
0
2
4
dB
100 1000 10000
Hz
040170
BE171211.book Page 24 Thursday, May 27, 2004 1:01 PM
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