CCS800 | Service manual | Chapter 7 | Diagnostics and faultfinding en | 25
Bosch Security Systems | 2005-01| 3922 880 21112
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 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 Maximum level of 110dB SPL from unit microphone gives -3dBV at AUDIO-CONTR
Input setting G1: X11 p-1 related to M2 (GND), see table below.
Settings for G1 Measurement results for A1
Amplitude Frequency Amplification
Nominal level -36dBV (15.8 mVrms) 1kHz -9.4dBV ± 1dB (85dB SPL)
Overload level -11dBV (281.8 mVrms) 1 kHz +3dBV ± 1dB (115dB SPL)
Bandwidth -36dBV (15.8mVrms) 125 Hz -2dB ± 2dB related to nom. level at 1kHz
Bandwidth -36dBV (15.8mVrms) 12.5 kHz -1dB ± 1dB related to nom. level at 1kHz.
Reference: M2 See Ch. 13.4
M57, 59, X5 See Ch. 13.5
M1, X2, 3 See Ch. 13.7
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