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The AGND pin serves as a reference for the SPL and
temperature measuring input circuitry. To keep this
ground signal as clean as possible, the AGND wires
together with the MIC and the NTC signal should be
run through a shielded cable. The shield should be
connected to the GND pin of this terminal block.
• AGND should not be connected to any other
ground pin (GND or DGND) on the chassis.
Fig 8 Ground configuration of the Intellivox chassis.
Fig 9 Standard grounding configuration
• Because safety is a very important issue, the safety
ground pin of the IEC mains connector should
always be connected to a low impedance ground
network.
If the standard solution is chosen to be connected the
audio (line level) inputs the grounding situation is
according to Fig 9.
Intellivox DDC | Installation Manual | Appendix
Bosch Security Systems | July 2003
EN
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