cctv systems n.
Skip this Video
Loading SlideShow in 5 Seconds..
CCTV SYSTEMS PowerPoint Presentation
Download Presentation


309 Vues Download Presentation
Télécharger la présentation


- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript


  2. CCTV SYSTEMS • There are a number of issues that may arise after the installation of a CCTV system. • We will take a look at some of the most common problems that can occur and the procedure to troubleshoot them and correct them.

  3. CCTV SYSTEMS • Picture not Displayed on the Monitor: • The most common cause of this problem is the presence of open or shorts in the wiring cable.

  4. CCTV SYSTEMS • Start by disconnecting the cable at both ends; and test the cable with a digital multi meter or coax tester.

  5. CCTV SYSTEMS • Another possibility is power supply loss, the 18/2 cable supplying the power should be tested for opens and shorts. • The terminals should be checked to ensure they are fully crimped on the wire. • The power supply fuse should be checked and can also be tested for an open.

  6. CCTV SYSTEMS • If all of the channels are blank, no video present on any channel then the video link from the DVR to the monitor should be tested. • The monitor may need to be adjusted, the contrast or brightness settings may be to high or to low.

  7. CCTV SYSTEMS • Presence of “Ghost Effect” in the Monitor • Reflections of the improperly terminated video signals are seen as ghost images.

  8. CCTV SYSTEMS • These are secondary images which cause distorted viewing. • The signal has to be either redirected onto another video product or terminated to solve the issue

  9. CCTV SYSTEMS • Darker Foreground in Bright Background • This is caused when a bright spot in the image makes the iris close or the imager to reduce picture gain. • Hence the unlit region appears darker than the rest.

  10. CCTV SYSTEMS • Adjust the backlight compensation or repositioning the camera seems to be an effective alternative to avoid lighting problems of this sort.

  11. CCTV SYSTEMS • Smearing of Bright Spots on the Monitor • The light reflected from the scene being viewed is captured by the camera. • When the light source is bright, a bright white spot with a vertical line passing through it may be seen on the monitor, It is more common during nights.

  12. CCTV SYSTEMS • Altering the position of the camera so as to avoid bright light in the scene can help to eliminate the bright spot. • Installing the auto iris feature will also help to reduce the bright spots and lines.

  13. CCTV SYSTEMS • Snowy Picture or Scrolling of Snowy Bars on the Screen • When RFI or EMI signals are picked up by coax cables, it results in snowy bars.

  14. CCTV SYSTEMS • Inexpensive cables most often cause this kind of problems especially in long cable runs. • The cables must be re-routed away from sources of EMI. • Another possibility is that the coax has a kink in it somewhere along the route.

  15. CCTV SYSTEMS • Cable quality always plays an important role in the overall performance of any low voltage system and this holds true for CCTV as well. • As mentioned before the coax cable used for CCTV should have a copper braid and not an aluminum braid.

  16. CCTV SYSTEMS • Poor picture quality or no video image can also be a sign of a voltage drop problem. • Voltage drop problems occur over long cable runs and can be solved by installing an amplifier on both ends of the coax link.

  17. CCTV SYSTEMS • Outdoor cameras are subject to all sorts of weather and if a BNC connection gets wet it will cause attenuation problems. • If the connection is getting wet then you will have to waterproof the connection which can be done with a silicon caulk.

  18. CCTV SYSTEMS • After the system has been installed and operating for awhile the monitor may go completely black. • Menu functions may not be accessible anymore as a result, this is an indication that the hard drive has crashed and needs to be replaced with a new SATA hare drive.

  19. CCTV SYSTEMS • Over time outdoor camera enclosures will become dusty and dirty providing a poor image and the lenses will need to be cleaned. • Remember that the sun shield plays an important role in reducing sun glare and they can be adjusted forward more to further reduce glare.

  20. CCTV SYSTEMS • It should be noted here that you start with the most basic of troubleshooting steps. • Is the power to the monitor on, is the power on to the power supply box, is the power on to the power strip etc. • Sometimes the simple stuff eludes us.