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Video Ground Loop İsolator,Video Groundhog,Video Ground Loop,Video Ground Loop İsolator Schematic,Video Ground Loop İsolator Rca..Since the origin and destination of the video signal may be different potentials are ground loop AC or DC currents March and cause a longitudinal buzz for inclusion in the video signal. It is a video Buzz (mains frequency of 50 or 60 Hz and harmonics) low frequency noise My line was affected by the video signal, degrading the signal visible. Buzz is generally considered vertical video security bar, ears can cause image distortion or tearing of the picture in severe cases. a buzz video can be a problem in all systems in which video sources and display devices are connected to different energy sources, A / C at different ground potentials.Typically, a buzz can be seen gradually moves in the vertical direction of the bar Horizonal video signal standard television. The same type of bar can also be viewed on a computer screen, but generally are not as visible, because the beams are moving so fast that the air strange flicker on the screen.
Here is a real world example of the effects of a ground loop and cause the network cable from the video:Ad you can see the video signal is strong hummign bars and other IT devices. Those who have entered the cable TV signal due to ground loops in the system. video systems, ground-loops can have the following effects:Hum bars: the mains frequency (50 Hz or 60 Hz) can cause stationaly or move the zoom bar appears on the horizon of the video signal (as shown above). If you are on dimmers to close the trendy bars can easily become very serious and can be easily seen.RF Interference: interference spike for the video line is caused by a ground loop (including coaxial cable protection), which acts as an antenna for AM radio. Any loop wire width is a good antenna AM. These antennas are particularly suitable for collecting particulate emissions, although most of the loop is vertical.
Cross-Talk: Ground loops can cause the signal to interfere with another, as each cable is through protection re-ideally equivalent driver, but there is no other route through the conductor caused by voltage differences in protecting unwanted data about the cables.
the ground loop isolation of video lines
Isolation of the video signal is more complicated than audio signals or isolation of the antenna, since the DC level of the video signal is high and the video signal are spectrum very high frequency (standard bandwidth of composite video 50Hz be 6MHz can).the isolation of the video signal generally requires active technology, with input isolation or electro-optical differential amplifier floating ground. These techniques are useful for real-world situations. differential input floating mass works well for small differences in ground potential, and this approach is used in some devices profes video (some video projectors I’ve seen is the differential inputs and the ability to disconnect from the input to ground ). The differential inputs are also used in applications where the video signal to a twisted pair cable (some applications using interface devices CCTV twisted pair circuit) is transmitted.electro insulation works well for applications in which the complete electrical isolation necessary. There are a number of such isolation devices on the market and some special video distribution amplifiers have built such an option.elemination ground loop does not always ask for complete privacy reasons. There are passive dampers transformers hum that very efficiently removes the hum of the video signal (usually about 40 dB lower than the zoom), but do not touch the video signal otherwise. These special to the common mode choke transformer, which stop loop currents in ground shield coaxial calbe boring, but provide a direct path signal in the cable. Such devices are capable of transmitting signals DC to several tens of MHz smoothly. This type of transformer hum suppression have found their way into the application professional video (leasing companies) and applivations comouter video (video projector connections equipment). Transformers of this type are generally called ‘transformers Hum Bug’, ‘dual-winding transformers’,’ video converters with anti-hum ‘or’ buzz preventive transformer. Hum-rogue, the term generally refers to any circuit (often a special coil), which introduces a small amount of route of the transmission line-frequency voltage to cancel the unwanted hum.
In addition, a special isolation transformer, which can isolate the video signal bandwidth. The transformer, which may well move all video frequencies without much distortion is very difficult to produce, what few of them on the market. Part of the isolation transformers are designed exclusively for video surveillance applications where signal distortion is accepted that the broadcasting industry.The starter (Humbugging transformer) is mainly used for TV broadcasting, as it passes the DC component of the signal. It is used in research, and remote ENG. The isolation transformer is mainly used for CCTV: security, manufacturing, avionics, screen, etc.
differential amplifiers video
approach of differential amplifier using an operational amplifier. complete only the difference between the two amplifiers voltage variations. This method will eliminate the noise of the common mode signals A = BC, since only the difference is amplified between A and B. The operational amplifiers to keep the signal through a high system bandwidth while eliminating the problems ground loop resulting power and video. video amplifier inputs Diffeerential used in some video devices (usually a couple of video projectors) and video distribution amplifiers to avoid ground loops problems.video differential amplifiers are limited to the range of input voltage that will give some of the restrictions on the number of common-mode signals of these circuits can tolerate. If the difference between the ground potential is greater than a few volts, insulating materials based operational amplifiers do not work effectively. Too much voltage difference can cause problems video signal, very distorted to a differential video amplifier damaged. If the voltage difference is an important part of the supply voltage DC amplifier, it can be difficult to use a single amplifier.
It’s a good idea to measure the voltage difference between the differential amplifiers before the video can be sure not damagze. The measurement can be performed with a multimeter (measured using AC and DC ranges) or better using a variety of grounding of the electricity grid and place the probe in the video cable in the country. So much potential that many volts, then it is very likely that something is wrong with the building to the ground and you should consult a qualified professional to verify and correct the potentially dangerous electrical problem professional.Good back porch clamp the black level
If the input video signal is a black-hold circuit at high speed level properly designed you can also solve small problems with the sounds of common mode caused by ground loops. clamping circuit ground on the back porch to adjust the black level of a video circuit of the incoming video signal. If the black latch level is an active circuit that samples the level of black saparately each can busbars loop field is removed very efficiently, because the low frequency noise (50 Hz or harmonics) is sampled at the beginning of each scan line, and then removed, the rest of the line. This works very well in these bars or frequency hum, especially when combined with differential video inputs. security system black level back porch does not contribute to the fight against high frequency noise that could be injected into the system through the ground loop video.active video isolators
Insulation passes the video input of the output signal without electrical connection and video is able to offer a complete isolation of the video signal is transmitted through it. Have a way of insulating Video video signal can be connected to standard safety ground all equipment without the problems associated with ground loop. The study, promoted by different buildings are no longer a problem, and it is necessary to complete the technical field..