External Microphone Input To Line Out Measurement - Bosch CCS800 Service Manual

CCS800 | Service manual | Chapter 7 | Diagnostics and faultfinding
7.3.7

External microphone input to line out measurement

Connect successively a sine-wave generator to the left and right external microphone input connections, ("MIC-IN+"
(M131) and "MIC-IN-" (M132) ) related to GND (M133).
NOTE: be sure that the gain control potentiometer (R199) of the external microphone input is set to the middle position.
Input setting G1: X130 p-2 related to X130 p-1 (GND) and X130 p-3 related to X130 p-1 (GND), see table below.
Settings for G1
Amplitude
Nominal level -56 dBV (1.6 mVrms)
Maximum level -31 dBV (28.2 mVrms)
Bandwidth -56 dBV (1.6 mVrms)
Bandwidth -56 dBV (1.6 mVrms)
Mute level: set -56dBV (1.6 mVrms)
S2 to chairman
only mode
•
Set S2 back to position AUTO 1.
Reference: M119
M131, 132, 133, R199
Bosch Security Systems | 2005-01| 3922 880 21112
Frequency
1 kHz
1 kHz
125 Hz
12.5 kHz
1 kHz
See Ch. 13.6
See Ch. 13.7
Measurement results for A1
Amplification
-15 dBV ± 2dB (85dB SPL)
+10 dBV ± 2 dB (110 dB SPL)
-3dB ± 2dB related to nom. level at 1kHz
-0.5dB ± 1dB related to nom. level at 1kHz.
< -74 dBV (selective) or < -74 dBV (A-weighted)
en | 26