BRUEL & KJAER 2206 - Effect of Vibrations; Use with Pink Noise Test Record or 2011

The curve resulting from this calculation is shown in Fig. 3. 7.
Relative
Response
(dB)
5
0
- 5
10
20
50 100 200
-
-
'
\
\
'
500 1 000 2000
5000
1 0000 20000
Frequency (Hz)
169063 / 1
Fig. 3. 7. Random incidence response of complete instrument
with microphone attached
3.7.4. Effect of Vibrations
Fig . 3 .8. shows a typical vibration response of a meter clamped and vibrated in the man-
ner shown in the inset. The maximum sensitivity to vibration is 90 dB (A) at 1 g.
Equivalent
C weighted
SPL (dB)
90
80
70
60
50
-
f--
-
f--
-
f--
10
20
~
(
I
I
l.J
50
Ill
II ::::::::o
_,))-""
I
'
1\
n
J
'V
100 200
'
I
J ~
~
Jf'l I
1\ ..
I•
I~
~·
[
'
500
1 k 2 k
Fig. 3. 8. Typical response to vibration
3.8. USE WITH PINK NOISE TEST RECORD QR 2011
~
~
5 k 10 k 20 k
Frequency (Hz) 169021
The Pink Noise Test Record OR 2011 contains 31 third octave bands of pink weighted
random noise covering the 20Hz to 20kHz frequency range. The record used in conjunc-
tion with Precision Sound Level Meter Type 2206 permits measurement of a hi-fi sys-
tem's frequency characteristics.
1. Position yourself in the normal listening position and point the 2206 towards the
loudspeakers.
2 .
Set the WEIGHTING NETWORK SELECTOR to "Lin." and the Power Switch to
"Slow".
15