Bose T5 Service-Handbuch - Seite 23

Blättern Sie online oder laden Sie pdf Service-Handbuch für Kopfhörer Bose T5 herunter. Bose T5 31 Seiten. Tactical headset

Seite drucken

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.

6. 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

•

Sound Booth Noise Switch - Off

•

Sound Booth Audio Switch - On

6.1 Talk-through (TT) Gain. Listen to the

Talkthrough 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.

Field Repair Light-up-and-Play Tests

1. Intercomm/Radio Communications Test

After repair, connect the headset to a

compatible radio or intercomm system and

verify that all functions work properly. Once

the headset has passed test, it can be

returned to use.

1.1 Connect the headset control module

cable to the radio or intercomm.

TEST PROCEDURES

1.2 Play an audio signal to the headset.

Verify that you can hear the audio being fed

to the headset from the radio or intercomm.

1.3 Speak into the microphone. Verify that

your voice signal is being received by the

radio / intercomm.

1.4 Disconnect the headset from the radio

or intercomm and perform the battery

powered tests located after the below noise

definitions.

Definitions

Background Noises Noise present in the

absence of other excitation, including the

following:

• Hum Constant low frequency signal,

caused by power line interference.

• Hiss Steady, broad mid-to-high frequency

signal caused by noise of headset electron-

ics.

• Static Intermittent crackling signal, caused

by external electrical interference.

• Whine Sharp continuous signal, caused by

narrow overvoltage pulses on power line.

• Ripple Noises caused by interference on

power supply line at various frequencies.

Instability Noises related to acoustic leaks

or malfunctions compromising stability,

including the following:

• Squeal Mid-to-high frequency variable

tone.

• Motor-boating Lower frequency periodic

noise.

• Buzz Harmonic produced by vibration in

the presence of an audio signal. This noise

is usually related to mechanical faults.

Overload Noises related to movement,

pressure or impact on headset as well as

extremely high external noise, including the

following:

• Click Sharp transient caused by collapse

of driver diaphragm. Generally very notice-

able.

• Thump Low frequency transient, caused

by saturation of headset electronics.

• Pop Low frequency transient, caused by

saturation of ANR loop.