BRUEL & KJAER 2305 - Automatic Recording of Directional Characteristics

50
db
40
30
.,
u
c
e
:t
20
"0
W
>
10 .,
Lo
I v 20 50 100 200 C/SSOO 1000 2000 5000 10000
I---- Frequency "" ..
Fig. 6.24. The sound pressure level difference between the two' olfices plotted
down manllally. Th e values are taken from the recorded chart ill Fig. 6.23.
Automatic Recording of Directional Characteristics.
When the Level Recorder is combined with the Turntable Type 3921 a
complete equipment for the automatic measurement of directional char·
_ •. 3' . ~ .2.
~ i '"'
2803
/6184"
Fig. 6.25. Measuring arrangement lor recording directional characteristics 01
loudspeakers.
87