Bose T5 Manuale di servizio - Pagina 24
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2. Active Noise Reduction (ANR) Opera-
tion, Quiet Environment
Setup Conditions:
•
Talk Through (TT) swith - OFF
•
Power supply input - 3.0 Volts
(2 AA batteries) in control module
•
Headset microphone switch - OFF
•
Headset battery ANR switch - OFF
2.1 In a quiet environment, listen to the ANR
operation as you stand still. Ensure that the
earcups are properly seated on your head.
2.2 Slowly compress the cups against your
head with your hands. Move the earcups
with your hands to simulate rapid head and
jaw movement.
2.3 Lift one of the earcups off of the ear
slightly at the back of the jaw to create a
small air leak. Listen for overload or instabil-
ity conditions. Perform this step for the other
earcup.
PASS/FAIL Criteria. Overload or instability
should not be heard under any test condi-
tions. When creating a leak in the back of
the jaw, short term (less than 1 second)
instability is allowed. If the instability is
sustainable by holding the earcup in the
position where the instability was heard, the
headset has failed this test.
3. Active Noise Reduction (ANR) Opera-
tion, Loud Environment
Setup Conditions:
•
Talk Through (TT) swith - Off
•
Power supply input - 3.0 Volts
(2 AA batteries) in control module
•
Headset microphone switch - Off
•
Headset battery ANR switch - Off
3.1 Listen to ANR operation as you stand
still. Ensure that the earcups are sealed to
your head.
TEST PROCEDURES
24
3.2 Slowly compress the cups against the
head with your hands. Move the earcups
with your hands to simulate rapid head and
jaw movement. Listen for overload or insta-
bility conditions.
PASS/FAIL Criteria. ANR Operation should
be apparent. Overload or instability should
not be heard under any test conditions.
4. Talk -Through (TT) Operation, ANR OFF
This test is to verify talk-through balance
and intelligibility.
Setup Conditions:
•
TT switch - Talk-through ON 0dB
•
Power supply input - 3.0 Volts
(2 AA Batteries) in Control Module
•
Headset Microphone switch - Off
•
Headset Battery ANR Switch - Off
4.1 Talk-through Balance - Listen to an
audio source such as spoken word.
4.2 Block the left talk through microphone
on the earcup with your hand and listen to
the audio signal through the right.
4.3 Uncover the left side and cover the
right side microphone. Listen to the audio
signal through the left side.
PASS/FAIL Criteria. The audio signal
should be heard at the same level in both
sides of the headset and there should be
no noticeable background noise.
4.4 Talk-through Intelligibility. Listen to a
minimum of four words from the audio
source.
PASS/FAIL Criteria. Words should be
heard clearly, and should be recognizable.
4.5 Talk-through Gain Switching. Move the
TT rotary switch to the 5dB position.
PASS/FAIL Criteria. Words should be
heard clearly and be recognizable.