Bose FreeSpace 360 보충 설명서 - 페이지 7
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3. Distortion Test
3.1 Apply a 780 mVrms, 1 kHz signal to the
input jack of the amplifier channel under
test.
3.2 Measure the distortion level at the
output of the amplifier. It should be ≤ 0.1%
THD.
FreeSpace
®
360 Surface Loudspeaker
Test Setup Parameters
1. Install the Equalizer card under test into
one of the Equalizer card jacks located on
the Input Module of the Bose
1800 Series amplifier, and perform the
following tests. Refer to the 1800V service
manual supplement part number 181812-
S2 for more information.
2. On the amplifier Input Module, place
switch SW1 to the NORM position. Place
switch S2 to the FULL BANDWIDTH
position.
3. The input voltage shall be the actual
input voltage present at the input, not the
open circuit generator input.
1. Surface Equalizer PCB Frequency
Response Test
1.1 Apply a 100 mVrms, 1kHz signal to the
input jack of the amplifier channel under
test.
1.2 Adjust the amplifier volume controls to
maximum. No EQ card installed.
1.3 Reference a dB meter to the output of
the amplifier.
1.4 Shut off the amplifier and insert the EQ
card according to the assembly procedure.
1.5 Turn on the amplifier and measure the
gain. There should be a +1.0 ± 1.0 dB
change in gain at the output.
TEST PROCEDURES
®
1600 or
7
1.6 Reference a dB meter and measure
the response of the EQ card according to
the Surface Frequency Response chart.
Surface Frequency Response
Frequency
30 Hz
90 Hz
180 Hz
900 Hz
1000 Hz
2000 Hz
5000 Hz
10000 Hz
2. Distortion Test
2.1 Apply a 780 mVrms, 1 kHz signal to the
input jack of the amplifier channel under
test.
2.2 Measure the distortion level at the
output of the amplifier. It should be ≤ 0.1%
THD.
Output Level
-8.8 dB ± 1.5 dB
+7.2 dB ± 1.5 dB
+11.0 dB ± 1.5 dB
+0.2 dB ± 1.5 dB
Reference
+0.4 dB ± 1.5 dB
+6.7 dB ± 1.0 dB
+17.9 dB ± 2.5 dB