Bose Acoustimass 3 Series Руководство - Страница 21
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Frequency
20 Hz
55 Hz
100 Hz
200 Hz
400 Hz
11. Bass Channel Dynamic EQ Gain
NOTE: Use the same test setup as Procedure 10.
A. Adjust the oscillator to 100 Hz, 30 mVrms. Use
this as a reference point.
B. Adjust the oscillator to 55 Hz. There should be
a boost of approximately 5 dB. (A 3.0 dB
difference between the 30 mV and the 200 mV
input level). Refer to the chart in the previous
procedure.
12. Woofer Power Output Test
NOTE: Use the same test setup as Procedure 10,
except remove the dB meter. Make sure that any
test equipment connected to the woofer output is
floated or isolated from ground.
Ω
A. Connect a 5
resistive load to the woofer
output. Connect a voltmeter across the load.
NOTE: These measurements can be obtained at
120 and 240 V. Results will vary depending on the
line voltage used.
B. Connect an oscillator to the module's L/R audio
input terminals. Adjust the oscillator to 100 Hz,
345 mVrms.
Relative Response
-18.0 dB ± 2.0 dB
+1.8 dB ± 1.5 dB
0 dB
-0.5 dB ± 1.5 dB
-10.7 dB ± 1.5 dB
±
1.0 dB
21
C. Measure the voltage across the load. It should
be approximately 15.8 volts (50 watts). The signal
should look undistorted when viewed on an
oscilloscope.
Complete System Tests
NOTE: Use these procedures when a complete
AM-3P II system (module and satellites) is to be
serviced.
1. System Phase Test
Use the procedures already listed for the satellites
and the module. Use Procedure 2 under Satellite
Test Procedures and Procedure 9 under Module
Test Procedures.
2. System Sweep Test
Use the procedures already given for the satellites
and the module,except use 220 mVrms for both
parts of the test. Use Procedure 1 under Satellite
Test Procedures and Procedure 2 under Module
Test Procedures. Make sure that the satellites are
connected to the bass module.
3. All Other Tests
All other tests listed under Module Test
Procedures can be used to test a complete
system.