Application Solutions (Electronics and Vision) Ltd. Company Confidential
ASL360 Installation and User Guide
documented; normally this information will be available in the instruction pamphlet accompanying the monitor.
7.4.9 Monitor power supply In a vehicle the available power supply is likely to have noise arising from the alternator and from power convertors. Without taking care, this noise can get superimposed on the video signal, and result in a degraded image on the monitor.
7.4.9.1 Monitor power & ground connections To prevent video noise appearing on the monitor, it is essential that the monitor ground is directly connected to the ECU ground with a low resistance connection. Cables offering ground connect resistance of 0.5 ohm have been know to be the route cause of video interference, therefore a resistance of 0.01 ohm or less is recommended. Note that video/power cables of ‘consumer’ quality are unlikely to be satisfactory. The advice in the following paragraph must be followed. [R7] [R9b] For all video equipment which takes a video feed from the ECU, provide a ground “star” point electrically close to the ECU. The ECU ground connection (VSUPPLY-) must be connected to this “star” point, and ideally the ECU case should also be connected.
7.4.9.2 Monitor power supply conditioning [R9c]
In extreme cases, where the monitor is not capable of dealing with power supply ripple, it may be necessary to condition the monitor’s power supply with a power filter or DC/DC convertor.
7.4.10 Monitor cable installation Ensure the cable is not subject to impact, chaffing and fatigue by suitable routing and providing protection as appropriate. [R16]
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Issue 1.4 - 14th June 2013 Incomplete, approved
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