BRUEL & KJAER 2209 - Pistonphone 4220

10
•
Free field corrections for type
~0"
r; 4144/45/46 with nose cone UA 0051
Pressure Response -0 dB
o•
./
db
180•
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r,-so. Random Incidence
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Incidence
~
-5
-10
1kHz
2 3 4 5 678910 15 20 30
Frequency (kHz)
Fig.6.24. Free-field corrections for 4145 +Nose Cone UA 0051
6.2. 10. Pistonphone 4220
This is a portable, battery driven
instrument.
It produces 124 dB re
2 x 10-
5
N/m
2
± 0.2 dB at 250 Hz
± 1% sinusoidal waveform. They are
individually calibrated and a barome-
ter, reading direct correction for
changes
in barometric pressure, is
supplied. It fits one inch to eighth
inch microphones.
Fig.6.25. 4220
85