Bose T5 Manuale di servizio - Pagina 26

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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