BRUEL & KJAER 4184-A, Техническая документация инструкция, Страница: 43 / 52

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Appendix D
Using Microphone Type 4184-A
D.1 Mount Pistonphone Type 4228 onto Type 4184-A
Weatherproof Microphone Unit Type 4184-A should be calibrated with Brüel & Kjær Pistonphone
Type 4228, which has a calibration frequency of 251.2 Hz and a calibration level of approximately
124 dB.
Fig.D.1
Left:
Windscreen
UA-1070 and
Windscreen Holder
UA-1071
Right:
Protection Tube
(Sound Calibrator
Adaptor) UA-1072
and Protection Cap
UA-1073
To mount Pistonphone Type 4228 onto Type 4184-A:
1) Unscrew the windscreen and windscreen holder (Fig.D.1 Left).
2) Screw on Sound Calibrator Adaptor UA-1072 (protection tube without protection cap; Fig.D.1 Right).
3) Insert the sound calibrator adaptor into the pistonphone Type 4228.
NOTE: UA-1072 and the pistonphone must be connected directly without the use of any of the
pistonphone’s adaptors.
In the Calibration setup of the analyzer’s software, select the Details tab and set Calibrator to Custom ,
insert the Sound Pressure Level obtained from the Calibration Chart of Type 4228 and add the ambient
pressure correction in dB, obtained from the barometer supplied with Type 4228.
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