Bose T5 Service Manual page 26

PASS/FAIL Criteria. The level of sound
heard through the talk-through must not
in-crease dramatically after the sound of
the words stabilizes. If verification is needed
compare ambient sound at increased gain
level to sound heard through the talk-
through system. If headset's compressor
takes longer than 5 words to stabilize, it is a
failure.
7. Talk-Through Operation, ANR OFF,
Quiet Environment
This test is used to verify Talk-through
balance, intelligibility, and compressor
operation.
Set-Up 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
7.1 Talk-through (TT) Gain. Listen to the
Talk-through background noise in a quiet
environment. Exercise the TT Switch to
+5dB and +10dB positions respectively.
PASS/FAIL Criteria. The noise of the TT
circuit should increase for both earcups at
the +5dB position, and then increase for
both earcups again at the +10dB position.
The headset should not oscillate with either
+5 or +10dB gain.
TEST PROCEDURES
26