Operation
Test environment
Excessive noise in the test environment can reduce test validity by masking test tones. The
test site should be away from conversation, printers, hallway traffic, outside auto traffic,
and other noise producing environments. An acoustically tested room may be required if
room noise at the subject’s ears reaches objectionable levels. Audiocups are available from
GSI as an optional accessory for use with the DD45 Earphones. Insert earphones are
another option in noisy test environments. They provide greater than 30 dB reduction of
external noises. If the test subject is in the same room as the audiometer, it is recommended
that the subject be seated about 1 meter (approximately 3 feet) away from the instrument.
Maximum permissible test environment sound-pressure levels are specified by
American National Standard Criteria for Permissible Background Noise during
Audiometric Testing, S3.1-1977 (revised)
.
Table 1 shows the maximum background
levels that can be present inside the room while a valid hearing test is being conducted
.
For more comprehensive information about hearing testing and hearing conservation,
refer to the
Bibliography
.
Test Tone Frequency (Hz)
*
Test Room -Maximum dB SPL
125
250
500
750
1000
1500
2000
3000
4000
6000
8000
34.5
23.0
21.5
22.5
29.5
29.0
34.5
39.0
42.0
41.0
45.0
Ears covered with earphone mounted in Type 51cushion.
Table 1
1718-0100 Rev. E
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