CCTV Trouble shooting. CCTV Troubleshooting. This information can be viewed by anyone however it is more directed at CCTV system installers. Below you will find hyperlinks to different areas of CCTV trouble shooting. O.jpg' alt='Difference Between Patch Cord And Utp' title='Difference Between Patch Cord And Utp' />To find the area you are searching for, just click the category. That will move the page up to the specific category. Troubleshooting Signal Attenuation In A CCTV System. Producing High Picture Quality On Long CCTV Cables. Aligning a CCTV Twisted Pair System for Maximum Performance a Proposal to Establish a System Quality Measurement Standard. Pre Digital Control what is it and Why is it Needed. How To Create Superior Quality CCTV Pictures On UTP How To Prove Results With The 4. Quality Test. Digital Video Recorder Problem Solving. A Comparison Of Analog Digital Audio Transmission Systems. Difference Between Patch Cord And Utp' title='Difference Between Patch Cord And Utp' />CCTV Video Camera Focus Problem Solving. CCTV Video Ground Loop Problem Solving. CCTV Line Lock Problem Solving Tips. A New Way to Synchronize Video Cameras. How CCTV Terminations Affect Picture Quality. CCTV Video Troubleshooting Tips. Why And How To Measure CCTV Camera Output Impedance. Augmenting CCTV Systems with Audio Surveillance. Over The Coax Audio for CCTV, A sound Investment. LXLH GBICs require a modeconditioning patch cord between the GBIC and MMF. Refer to the ModeConditioning Patch Cord section of the document Connector and Cable. For more details on the different types of cablesconnectors, cabling requirements, optical requirements distance, type, patch cables, etc., how to connect the. Video Multi Meters find Niche in CCTV Market. Standards and Procedures for Video Level Measurement. Miscellaneous. Troubleshooting signal attenuation in a CCTV system. This case history shows how decibel knowledge, a handheld oscilloscope, and intuitive thinking can be used to solve a troublesome problem. Now that we have a somewhat complete understanding of the decibel and how it applies to various types of signals, we can apply this knowledge, along with the many modern test instruments available today, in troubleshooting any electronic equipment operation problems that may come our way. As an example of how this may work, lets review a case history involving closed circuit television, coaxial cable, and shoddy workmanship. Background site information. We were called in by a client who complained about a very poor picture generated by a security camera on a closed circuit television CCTV video monitor on a simple point to point link. The picture had degraded from good to unusable over a short period of time and really got bad in the few days following a recent lightning and rainstorm. The general opinion was that lightning had somehow caused the problem. Upon inspection, we found that the CCTV system consisted of National Television System Committee NTSC standard video generated and displayed in black and white. The main monitoring point of the CCTV system was a loading dock and a weather proofed housed camera located on a 1. The camera was connected to a video monitor in a security shack some 2. Power to the camera was provided via a low voltage DC link on another coaxial cable, which was installed right alongside the coaxial cable used to transport the video signal. Both the monitor and camera low voltage DC supplies were simply plugged into a wall outlet convenient to the operator at the guards shack. Symptom. The picture on the video monitor looked as though someone had turned the contrast control all the way in one direction so that there was no contrast at all the picture looked washed out and was barely visible on the screen, which was a nearly uniform light gray. Testing procedures carried out. Our first task was to go up to the camera at the roof and see what the video signal looked like as it exited the camera. This test was much aided by the fact that our handheld, 5. MHz bandwidth, solid state, digitizing oscilloscope with LCD display had an internal battery pack and did not require any AC power for operation. First test. First, the coaxial cable was disconnected at the camera and a BNC style TEE fitting was installed. This fitting was equipped with a 7. Then, we connected our handheld oscilloscope into the remaining open end of the TEE. The result, as shown in Fig. NTSC composite video signal. Conclusion the camera was clearly putting out a good signal, which was about 1. V peak to peak across the 7. There is also a DC component with the AC video signal. We then placed our handheld oscilloscope into its meter mode and the above signal at the camera into the 7. B reference and stored into memory. This is shown in Fig. BV DC is taken as being close enough to zero to do the job. Now, the good signal right out of the camera was available to be used again and again as a comparison with signals we would measure at different locations. We then would be able to see how much loss of signal occurred along the path, all of which was supposed to be a consistent 7. The TEE was removed and the 7. Second test. The next test was made at the video monitor end of the cable and right at the point where the cable was connected to the monitor. Again, the TEE was used, but this time no 7. TEE was attached to both the monitor and the cable. Thus, there was a fairly good 7. Wpa Handshake Crack. The result of this test was that almost no video signal could be seen on our handheld oscilloscopes screen. We then changed the oscilloscopes vertical scale from 5. Vcm to 1. 00 m. Vcm and another measurement was taken, which is shown in Fig. As you can see, the video signal is simply attenuated but does not appear to be distorted in any way that is easy to see. Conclusion the signal loss was occurring along the 7. Video monitors have been seen to load down a signal due to an internal failure on its input circuit as such, we didnt want to rule this possibility out. A quick test with the TEE and the 7. Fig. 3. Now, we really could conclude that the signals loss was occurring along the 7. Third test. We next placed our handheld oscilloscope into its meter mode, while maintaining the connection to the TEE at the junction of the cable and video monitor. Ls Dyna Software Crack Windows more. This allowed us to take a relative d. B measurement reading, as shown in Fig. Remember, we did this at the camera end to establish a comparison reference. Here we see that a 1. BV DC loss exists. This loss represents a voltage loss ratio of 4. V for every volt put into the cableHow much signal attenuation should you expect on a 2. A quick look at the coaxial cable manufacturers Master Catalogue gave us the approximate answer around 2 d. B of loss at 1. 0 MHz for 2. RG 5. 9U type cable as used in CATV applications. The whole attenuation chart is shown in the accompanying table below. What we were seeing in this path was more than 1. B loss over and above that stated in the manufacturers literature. Also, the baseband video we were looking at shouldnt have a lot of really high frequency in it thus, the cable probably shouldnt attenuate as much as 2 d. B per manufacturers literature for 2. Oh yes, since the manufacturers information was provided only in d. B form, what would we have done if we didnt understand d. B and werent working in terms of d. B on our handheld oscilloscope You guessed it. We would have had no idea what was normal and what was not on a coaxial cable run of the type being investigated. All we would have had was some guesswork, which is not a very good way to go in most cases. Further analysis. What was happening on the cable The BNC connector at the video monitor end was inspected and it looked OK, except that it seemed to be a little wet after it was handled and the cable was flexed. Following this the same examination of the BNC at the camera end also failed to show any problems.