Acoustic Testing PDF
Acoustic Testing PDF
Acoustic Testing PDF
Acoustic Testing
In Association with
Anderson Mechanical Services
Loughgall,
Armagh
BT61 8HZ
www.andersonmechanical.net
Email: info@andersonmechanical.net
By
Colin Pearson
Head of Condition Monitoring BSRIA
Schools
DnT
B2 Average (Source 2)
110
100
90
80
D, Difference
70
60
50
40
30
20
10
125
250
500
1k
2k
Hz
DnT
T2 Average
2
1.8
1.6
T2, measured
1.4
1.2
T2, correction
1
0.8
0.6
0.4
T2, standard
0.2
0
125
250
500
1k
2k
Hz
dB
110
DnT
B2 Average (Source 2)
DnT
DnTw = 68 dB
90
100
80
90
80
70
Standard curve
moved to fit data
70
60
60
50
Standard curve
50
40
30
40
20
30
10
125
125
250
250
500
500
1k
1k
2k
2k
Hz
Hz
Description and identification of the building construction and test arrangement, direction of measurement:
Wall from plot 108 kitchen/dining room to 109 kitchen dining room
DnT
Frequency
1/3 Octave
f
dB
Hz
50
63
80
100
125
160
47.5
47.4
48.9
200
250
315
48.7
59.5
57.4
400
500
630
63.8
66.6
67.9
800
1000
1250
71.2
72.6
73.0
1600
2000
2500
75.0
78.0
80.4
3150
4000
5000
83.1
90
80
70
60
50
40
30
63
125
250
500
1000
2000
4000
Frequency f, Hz
C 50-3150
= N/AdB; C 50-5000
= N/AdB; C 100-5000
C tr,50-3150
= N/AdB; C tr,50-5000
Date: 22/06/2009
Signature:
= N/AdB;
DnTw
-Ctr
DnTw, + Ctr
dB
Pass
/
fail
61
52
Pass
67
60
Pass