Bose FREESPACE BMA-125 Servis Kılavuzu - Sayfa 14

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Frequency

Output

(dB)

50Hz

1KHz

ref

20KHz

3.5 Adjust Input Five until 11.2Vrms is

measured across the 8Ω load. Reference a

dB meter to the output.

3.6 Measure the response according to the

following table.

Frquency

Output

(dB)

20Hz

1KHz

ref

20KHz

4. 25 Volt Output

Note: Place a jumper between the output

connector labeled "4Ω" and the output

connector labeled "PRI". Connect a 5Ω

load to the 25V output and the terminal

marked lo.

4.1 Apply a 120mVrms, 1KHz signal to

Input Five. Adjust Input Five to full output

at the 25V output (just before clipping).

4.2 Measure the output. It should be

≥

25Vrms.

4.3 Measure the distortion. It should be

< .5%.

4.4 With the 25V output adjusted to

25Vrms, reference a dB meter to the

output. Measure the response according to

the following table.

Frequency

Output

(dB)

50Hz

1KHz

ref

20KHz

BMA-125 120V Test Procedures

Tolerence

(dB)

-2

-2.8

Tolerence

(dB)

-2

-2.5

Tolerence

(dB)

-2

-2.5

4.5 Adjust Input Five until 8.875 Vrms is

measured across the 8Ω load. Reference a

dB meter to the output.

4.6 Measure the response according to the

following table.

Frequency

Output

20Hz

1KHz

20KHz

5. 70 Volt Output

Note: Place a jumper between the output

connector labeled "4Ω" and the output

connector labeled "PRI". Connect a 40Ω

load to the 70V output and the terminal

marked lo.

5.1 Apply a 105mVrms, 1KHz signal to

Input Five. Adjust Input Five to full output at

the 70 Volt output (just before clipping).

5.2 Measure the output. It should be

≥

70.7 Vrms.

5.3 Measure the distortion. It should be

< .5%.

5.4 With the output adjusted to 70.7Vrms,

reference a dB meter to the output. Mea-

sure the response according to the follow-

ing table.

Frequency

Output

50Hz

1KHz

20KHz

6. Tape Output

6.1 Apply a 100mV, 1KHz signal to Input

Five.

6.2 Adjust Input Five to the full clockwise

position.

Tolerence

(dB)

-2

ref

-2.5

Tolerence

(dB)

-2

ref

-2.5