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CCS800 | Service manual | Chapter 7 | Diagnostics and faultfinding
7.3.6
Audio contribution to audio distribution measurement
Connect a sine-wave generator to one Trunk connectors (X2) M1 and measure the output signal at the other Trunk
connector (X3) M3.
Remarks:
•
Nominal level
•
Maximum level
Input setting G1: X11 p-1 related to M2 (GND), see table below.
Settings for G1
Amplitude
Nominal level
-36dBV (15.8 mVrms)
Overload level
-11dBV (281.8 mVrms)
Bandwidth
-36dBV (15.8mVrms)
Bandwidth
-36dBV (15.8mVrms)
Reference:
M2
M57, 59, X5
M1, X2, 3
Bosch Security Systems | 2005-01| 3922 880 21112
Nominal level of 85dB SPL from unit microphone gives -28dBV at AUDIO-CONTR. Nominal
setting of the Master Gain is at position 6. (Volume control S3). Due to a setting of the Master
Gain at maximum position, for measurements only, the AUDIO-CONTR must be adjusted to -
36dBV, instead of -28dBV.
Maximum level of 110dB SPL from unit microphone gives -3dBV at AUDIO-CONTR
See Ch. 13.4
See Ch. 13.5
See Ch. 13.7
Measurement results for A1
Frequency
Amplification
1kHz
-9.4dBV ± 1dB (85dB SPL)
1 kHz
+3dBV ± 1dB (115dB SPL)
125 Hz
-2dB ± 2dB related to nom. level at 1kHz
12.5 kHz
-1dB ± 1dB related to nom. level at 1kHz.
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