Bose AM-30P Посібник з експлуатації - Сторінка 32
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Друкувати сторінку11. Dynamic Equalization (volume control
dependent).
11.1 Apply a 37Hz, 1.0Vrms signal to the
left and right input (in phase). Reference a
dB meter to the applied signal. Set the unit
to test mode D. The bass channel output
should be -24.2 ± 1.5dBr relative to the
input.
11.2 Apply a 9.0kHz, 100mVrms signal to
the left and right channel inputs (in phase).
Reference a dB meter to the applied signal.
Set the unit to test mode D. The center
channel output should be -44.7 ± 1.5dBr
relative to the input.
12. Volume IC Mute Test
12.1 Master Volume Mute
Set the unit to test mode D. Apply a 100Hz,
1.6Vrms signal to the left and right channel
inputs (in phase). The bass channel output
should be ≤ 50mVrms.
12.2 Center Channel Mute
Set the unit to test mode F. Apply a 1.0kHz,
.5Vrms signal to the left and right channel
inputs (in phase). The center channel
≤
output should be
12.3 Surround Channel Mute
Set the unit to test mode F. Apply a 1.0kHz,
.5Vrms signal to the left and right channel
inputs (out of phase). The surround chan-
nel output should be ≤ 30mVrms.
AMPLIFIER TEST
13. Small Signal Distortion (.5 W output)
Note: All resistor loads connected, 30kHz
LPF. See test set-up parameters.
Channel
Input
Bass
14mVrms (L+R)
Left
64mVrms (L)
Right
64mVrms (R)
Center
38mVrms (L+R)
Surround 30mVrms (L+R
180°out of phase)
TEST PROCEDURES
30mVrms.
Freq.
Dist.
100Hz <0.4%
9kHz
<0.2%
9kHz
<0.2%
9kHz
<0.2%
9kHz
<0.2%
14. Large Signal Distortion
Note: Resistor loads connected only to the
channel under test.
Channel
Input
Bass
260mVrms
Left
295mVrms
Right
295mVrms
Center
182mVrms
Surround
156mVrms
15. Compressor Test
Note: Load resistors not connected.
Momentarily connect test mode B. Set the
line voltage to 85Vac.
15.1 Apply a 1.0Vrms, 1kHz signal to the
left and right inputs (in phase). The distor-
tion measured at the center channel output
should be < 10% THD.
15.2 Apply a 520mVrms, 100Hz signal to
the left and right inputs. The distortion
measured at the bass channel output
should be < 5%.
16. DC Offset
Note: No signal connected to the inputs.
Channel
Left
Center
Surround
Right
Bass
17. Noise
Note: All measurements are A-weighted
except for the bass channel. The bass
channel should be loaded. All inputs
shorted.
Channel
Left
Center
Surround
Right
Bass
32
Freq.
Distortion
100Hz
<0.2 %
1kHz
<0.2 %
1kHz
<0.2 %
1kHz
<0.2 %
1kHz
<0.2 %
Output (DC)
< 15mV
< 40mV
< 40mV
< 15mV
< 15mV
Output
< 350uVrms
< 600uVrms
< 450uVrms
< 350uVrms
< 2mVrms