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- The Voltage output of the power supply without any load =? Volts.
- The Voltage output of the power supply under full load =? Volts.
- The current available from the power supply =? Amperes or milli-Amperes.
The degree of A.C. power input regulation (how much the output voltage will change when the AC power system voltage changes).
These factors are what determine the first kind of voltage drop limitation. These three factors must provide sufficient voltage to drive the camera, but never exceed the cameras maximum limits under any conditions.
- The maximum input voltage to the camera = ? Volts
- The minimum input voltage to the camera = ? Volts
Since minimum input voltage is such an important voltage, it must be measured when the camera is first installed. Make sure that the camera is fully functioning during the measurement and that any necessary illumination is turned ON during this measurement. Insure that the resultant measurement exceed the minimum voltage the camera is supposed to operate at correctly. If the measurement indicates that the voltage at the camera is too low, then doubling up the power supply wires or installing heavier wire may be necessary to insure correct camera operation.
- The maximum current drawn by the camera =? Amperes or Milli-Amperes.
Factor 4, 5, and 6 determine the second kind of voltage drop limitation. Factor number 2 the Voltage output of the power supply under full load must exceed Factor number 5 or the system will not function correctly. Subtracting Factor 5 from Factor Number 2 will determine the maximum CAMERA RANGE available. Record this voltage for future reference. This is the greatest voltage drop that the system can tolerate and determines the distance a camera can be placed from the source of power.
It is a wise procedure to document all six of these numbers somewhere, so that at a later date they can be consulted to see whether additional cameras can be added and what the CAMERA RANGE is on any given type of installation.
CAMERA RANGE can be extended by using multiple pairs of wires, or larger gauge wires on any given installation doubling the number of wires will double the CAMERA RANGE, and tripling the power delivery wires will triple the CAMERA RANGE and so forth. Also going to a larger wire size does the same thing. Consult the wire gauge table to see how much additional CAMERA RANGE can be obtained in each wire size.