| The Glossary An all inclusive glossary of security lingo is provided for your convenience. This list will undoubtedly be helpful when delving in to the realm of security. |
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| O: O/P - Output. Objective - The very first optical element at the front of a lens. Ocular - The very last optical element at the back of a lens (the one closer to the CCD chip). Ohm - The unit of resistance. The electrical resistance between two points of a conductor where a constant difference of potential of 1 V applied between these points produces in the conductor a current of 1 A, the conductor not being the source of any electromotive force. Oscilloscope (also CRO, from cathode ray oscilloscope) - An electronic device that can measure the signal changes versus time. A must for any CCTV technician. Over scan - A video monitor condition in which the raster extends slightly beyond the physical edges of the CRT screen, cutting off the outer edges of the picture. Output impedance - The impedance a device presents to its load. The impedance measured at the output terminals of a transducer with the load disconnected and all impressed driving forces taken as zero. |
Courtesy of CCTV Labs and CCTV focus magazine
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