Audio Contribution To Loudspeaker Measurement - Bosch CCS800 Service Manual

CCS800 | Service manual | Chapter 7 | Diagnostics and faultfinding
7.3.5

Audio contribution to loudspeaker measurement

Insert a sine wave signal to the AUDIO-CONTR via M1 related to M2 and measure the output signal between M59 and
M57.
Input setting G1: X11 p-1 related to M2 (GND), see table below.
Settings for G1
Amplitude
Nominal level -36 dBV (15.8 mVrms)
Bandwidth -36 dBV (15.8 mVrms)
Bandwidth -36 dBV (15.8 mVrms)
Reference: M2
M57, 59, X5
M110, 111, 121, 124, 150, 151
M1, X2, 3
Bosch Security Systems | 2005-01| 3922 880 21112
Frequency
1 kHz
125 Hz
12.5 kHz
See Ch. 13.4
See Ch. 13.5
See Ch. 13.6.
See Ch. 13.7
Measurement results for A1
Sound level
-7.8 dBV ± 1.5dB (72 dB SPL)
-6.5 dBV ± 2 dB related to nom level at 1 kHz.
-2.5dB ± 1.0dB related to nom. level at 1kHz.
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