
Hand-held Analyzer Type 2250 –
Instruction Manual
22
4.6.3 Low-frequency Responses
Fig.4.3 Low-frequency response of Hand-held Analyzer Type 2250 (including Microphone Type 4189)
4.6.4 Free-field Frequency Responses
The Free-field Frequency responses for plane progressive sinusoidal sound waves incident from the
reference direction with Z-frequency-weighting are provided in Fig.4.4 to Fig.4.9.
Fig.4.4 Free-field frequency response of Microphone Type 4189 only, with 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 ‘None’, see Table A.2. Reduced IEC 61672–1 limits are also drawn on the graph.
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Normal 2250+ZC0032+4189
Extended 2250+ZC0032+4189
Normal Electrical Input Socket
Extended Electrical Input Socket
IEC Class 0
IEC Class 0
Response (dB)
Frequency (Hz)
1 10
100
2
1
0
-1
-2
-3
-4
-4
-2
0
2
4
dB
100 1000 10000
Hz
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BE171211.book Page 22 Thursday, May 27, 2004 1:01 PM
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