Installation & Operation Manual

Wilat_Op_Man_23Oct08.doc CONFIDENTIAL
Aearo Technologies Page 12 of 21 18/07/2007
The instrumentation required includes a Type I Precision Sound Level Meter with 1/3 -1/1 octave
band filters, appropriate condenser microphone, microphone cable, preamp adapter, and one or
more audiometer “analyzer(s)”, each connected and calibrated according to the manufacturer’s
specification. The metal nipple of the transducer case is connected directly or indirectly to the
coupler depending on the type of coupler used (see Figures 3.1 and 3.2). Set the intensity level
of the audiometer to 70dB HL and adjust the output from the audiometer to precisely match the
SPL values given for each of the audiometric test frequencies in Table 3.1. Repeat the procedure
for all available test frequencies, and in the case of a dual channel audiometer, for both channels.
Figure 3.1 Figure 3.2
Table 3.1 - ANSI S3.6-2004 / ISO 389- 2:1994 Calibration Values
ANSI S3.6-2004 / ISO 389-2:1994 Calibration Values (Reference equivalent threshold sound pressure
levels {RETSPLs} {dB re 20µ Pa} plus 70 dB audiometer HL setting for insert earphones)
F
F
r
r
e
e
q
q
u
u
e
e
n
n
c
c
y
y
i
i
n
n
H
H
z
z
C
C
o
o
u
u
p
p
l
l
e
e
r
r
2
2
c
c
c
c
D
D
B
B
-
-
0
0
1
1
3
3
8
8
(
(
H
H
A
A
-
-
2
2
)
)
C
C
o
o
u
u
p
p
l
l
e
e
r
r
I
I
E
E
C
C
6
6
0
0
7
7
1
1
1
1
C
C
o
o
u
u
p
p
l
l
e
e
r
r
2
2
c
c
c
c
H
H
A
A
-
-
1
1
125
96.0 98.0 96.5
250
84.0 87.5 84.5
500
75.5 79.5 76.0
750
72.0 76.0 72.0
1000
70.0 75.5 70.0
1500
72.0 79.5 70.0
2000
73.0 81.5 72.5
3000
73.5 83.0 72.5
4000
75.5 85.0 70.0
6000
72.0 86.0 67.5
8000
70.0 85.5 66.5