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ANSI S3.1-1999 - Ears covered: octave band MPANLs using a supra-aural or
insert earphone for three test frequency ranges re: 20µPa to nearest 0.5 dB.
Octave Band
Intervals
125
250
500
1000
2000
4000
8000
The ears covered MPANLs shown in the above table were derived using
mean earphone attenuation values. To decrease the chance that individual
listeners for whom less than average attenuation is obtained will experience
threshold shift, the MPANLs can be lowered by reducing the amount of
earphone attenuation. An appropriate reduction would be equal to the mean
attenuation minus one standard deviation. The net effect would be that the
MPANLs would be lower (more stringent) for ears covered testing. This
reduction would cover about 84% of all subjects. The standard deviations for
Insert Earphones for 125 to 8000 Hz are between three (3) and six (6)
decibels. Please refer to ANSI S3.1 – 1999, Table A.2, for specific standard
deviation values by frequency.
3. Positioning of the E-A-RTONE
While the shape of the E-A-RTONE
instrument, correct insertion of the connected E-A-RLINK
portion in front of the pinna.
block the non-test ear with an E-A-R
4. Cable Assembly
The junction or pod portion of the cable assembly should be supported at or
near the patient's mid chest level to relieve tension on the E-A-RLINK
couplers. This can be accomplished by attaching the Velcro-backed clip to the
pod and then clipping the pod directly to the subject's clothing. Alternatively,
the clip can be attached to the metal ring on the adjustable lanyard that is
worn around the neck.
5. Pure Tone Calibration
When the E-A-RTONE
transducer, the audiometer should be recalibrated using the reference
thresholds provided in ANSI S3.6-1996. The standard presents reference
Supra-aural Earphone
125 -
250 -
8,000 Hz
8,000 Hz
35.0
39.0
25.0
25.0
21.0
21.0
26.0
26.0
34.0
34.0
37.0
37.0
37.0
37.0
Always use E-A-RLINK
®
5A Insert Earphone is to be used as the primary
E-A-RTONE Full Insertion
500 -
125 -
8,000 Hz
8,000 Hz
59.0
49.0
35.0
53.0
21.0
50.0
26.0
47.0
34.0
49.0
37.0
50.0
37.0
56.0
®
®
5A case is similar to that of a small BTE
foam plug.
®
5
250 -
500 -
8,000 Hz
8,000 Hz
67.0
78.0
53.0
64.0
50.0
50.0
47.0
47.0
49.0
49.0
50.0
50.0
56.0
56.0
®
will place the case
®
tips in both ears, or
®
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