Telephone-In To Line-Out Circuit Measurement - Bosch CCS800 Service Manual

CCS800 | Service manual | Chapter 7 | Diagnostics and faultfinding
7.3.11

TELEPHONE-IN to LINE-OUT Circuit measurement

Remove the interconnections of TELEPHONE -IN and connect successively a sine-wave generator to the TELEPHONE -
IN L connector. Measure the output signal at the LINE-OUT connector.
Input setting G1: M150 related to M151 (GND), see table below.
Settings for G1
Amplitude
Nominal level -14dBV (200mV
Maximum level +11dBV (3.55V
Bandwidth -14dBV (200mV
Bandwidth -14dBV (200mV
Reference: M119
Bosch Security Systems | 2005-01| 3922 880 21112
Frequency
) 1kHz
rms
) 1 kHz
rms
) 125 Hz
rms
) 12.5 kHz
rms
See Ch. 13.6
Measurement results for A1
Amplification
-14dBV ± 1dB (85dB SPL)
+11dBV ± 1dB (110dB SPL)
-0.5dB ± 2dB related to nom. level at 1kHz
-0.5dB ± 1dB related to nom. level at 1kHz.
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