At the moment of design, I have utilised only four switches with the fifth being a switch-over relay. The function of each switches are:
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This is the final layout of the control panel for the tester |
- Activates LCD Monitor
- Activates built-in CCTV Camera (when selected from selector switch)
- Indicates External CCTV power supply Polarity
- Selects video signel from external CCTV source
- Selects video signal from built-in CCTV camera
- Tests for cable status
- Activates cable test circuit
- Selects and activates voltage meter to test internal battery
- Selects and activates voltage meter to test external 12v power supply
- Automatically switches to external power when there is voltage
- In this mode, all monitors, CCTV and Polarity are active
- In battery mode, all testing must be manually activated