Frequently Asked Questions about Surveillance System-Matrix
1. Whether the programming is correct and whether there are any omissions.
A. When using the sub-control keyboard, whether the programming of the monitor assignment and authorization is correct.
B. When setting up the alarm monitoring and recording, are the alarm devices connected correctly? Whether the programming is reasonable (data conflict of related equipment).
C. Connect external controlled equipment. Pay attention to the data port provided in the manual, such as fast dome, decoder, and alarm equipment. Connect and program correctly.
2. Matrix failure
a. There is no display after starting, please check the fuse.
B. There is no display when starting the matrix box with more than 32 channels. Check whether the self-checking LED of the card works normally. When abnormal, re-insert the board.
C. When there is no output from a certain channel, you can change the normal image of one channel to check whether it is a matrix problem or other problems.
D. The control is invalid, please check whether it is connected to the control port, and whether the controlled device is coded; try another port.
Frequently Asked Questions about Surveillance System-Camera
1. No image output
a. Check whether the power supply is well connected and whether the power supply voltage is sufficient.
B. Whether the BNC connector or video cable is in poor contact.
C. Whether the lens aperture is open.
D. Whether the control line of the auto iris lens driven by video or DC is connected correctly.
2. Poor image quality
a. Whether the lens has fingerprints or is too dirty.
B. Is the aperture adjusted properly?
C. Poor contact of the video cable.
D. Is there any problem with the electronic shutter or white balance setting?
E. Whether the transmission distance is too far.
F. Whether the voltage is normal.
G. Whether there are interference sources nearby.
H. When installing in the elevator, it must be insulated from the elevator to prevent interference.
i. Is the CS interface connected correctly?
Frequently Asked Questions of Surveillance System-Decoder
decoder
1. Turn on the power, the power indicator does not light.
A. Check whether the power supply is added to the terminal.
B. Check whether the power fuse is damaged.
2. Power on burn insurance
a. Check if the common terminal (com) of the terminal is correct.
B. Check if the output voltage selection of the gimbal is correct.
3. Power light is on but cannot be controlled
a. Whether the signal cable is connected correctly.
B. Whether the signal lamp flashes during control.
C. Is it coded correctly?
4. Control is not working
a. Check the control code signal cable.
B. The control line of the same signal line is too long.
C. Too many decoders connected in parallel (parallel) on the same signal line
1. Failure of the gimbal. A pan / tilt does not work well or cannot rotate at all soon after use, which is a common malfunction of pan / tilt. In addition to the factors of product quality, this situation is generally caused by the following reasons:
(1) Only the pan / tilt head where the camera is installed is allowed, and the method of lifting is used when it is used. In this case, the hoisting method leads to increased operating load of the gimbal, so the transmission mechanism of the gimbal will be damaged soon after use, and even the motor will be burned.
⑵ The total weight of the camera and its protective cover exceeds the load-bearing capacity of the gimbal. Especially for gimbals used outdoors, the weight of the protective cover is often too large, and the problem that the gimbal cannot rotate (especially in the vertical direction) often occurs.
⑶ The outdoor gimbal has malfunctioned or even damaged due to the high ambient temperature, low temperature, poor waterproof and anti-freezing measures.
2. When the distance is too far, * The keyboard cannot remotely control the camera (including the lens) and the gimbal through the decoder. This is mainly because the control signal attenuation is too large when the distance is too far, and the control signal received by the decoder is too weak. At this time, a relay box should be installed at a certain distance to amplify the shaping control signal.
3. The image contrast of the monitor is too small and the image is light. If this phenomenon is not a problem of the control host and the monitor itself, or the transmission distance is too far or the video transmission line is too attenuated. In this case, a device for line amplification and compensation should be added.
4. The image clarity is not high, the details are lost, and in severe cases, the color signal will be lost or the color saturation will be too small. This is caused by the excessive loss of the high-frequency end of the image signal, and the basic loss of signals at frequencies above 3MHz. In this case, the transmission distance is too far, and there is no amplification compensation device in the middle; or the distributed capacitance of the video transmission cable is too large; or the concentrated equivalent capacitance appears between the core and the shielding line of the transmission line Caused.
5. Tonal distortion. This is a failure phenomenon that is easy to occur in the long-distance video baseband transmission mode. The main reason is that the high-frequency phase shift of the signal caused by the transmission line is too large. In this case, a phase compensator should be added.
6. * Keyboard failure. This phenomenon can basically be determined to be caused by keyboard "death" when the connection is checked. The instructions of the keyboard * generally have a solution to the "death", such as "whole reset" and other methods, which can be solved by this method. If the problem cannot be solved, the keyboard itself may be damaged.
7. The host's switching of images is not clean. The performance of this kind of fault phenomenon is that the screen after the selection and cutting is superimposed with the interference of other screens or the interference of the line sync signal of other images. This is due to the poor quality of the main mechanism matrix switch and the requirement to achieve isolation between images.
If a radio frequency transmission system is used, it may also be caused by excessive crosstalk modulation and intermodulation of the system.
A large-scale TV monitoring system that operates in conjunction with anti-theft alarms is a highly technical and complex system. Although various failure phenomena may occur, as long as the quality of the selected equipment and equipment is properly controlled and the construction is strictly in accordance with the standards and specifications, there will generally be no major problems. Even if it appears, as long as you calmly analyze and think, and do not blindly dismantle and dismantle, you will solve the problem quickly.
1. Equipment failure caused by incorrect power supply. Incorrect power supply generally has the following possibilities: the power supply line or the power supply voltage is incorrect, the power is not enough (or the line diameter of a certain power supply line is not enough, the voltage drop is too large, etc.), the transmission line of the power supply system has a short circuit, open circuit, instant Press and wait. In particular, damage to the equipment due to power supply errors or transient overvoltages has occurred. Therefore, in system debugging, before power supply, it must be carefully and strictly checked and checked, and should never be taken lightly.
2. Because there are many connections for some devices (such as cameras with three variable lenses and gimbals), if the processing is not good, especially the lines connected to the device are not processed well, there will be open circuit, short circuit, line Problems such as poor insulation and incorrect wiring cause equipment damage and performance degradation. In this case, it is necessary to calmly analyze according to the fault phenomenon and determine which lines have the faulty connection on several lines. This will reduce the scope of the problem. It is particularly worth noting that due to the omnidirectional movement of the camera with the gimbal, it takes a long time to cause the connection to fall off and break. Therefore, pay special attention to the connection between the equipment and various lines in this case should meet the requirements of long-term operation.
3. The quality of the equipment or component itself. In theory, all kinds of equipment and components are likely to have quality problems. However, from an empirical point of view, it is purely a quality problem of the product itself, which mostly occurs in devices such as decoders, electric pan-tilts, transmission parts and so on. It is worth pointing out that some devices may not be unusable in terms of quality as a whole, but some technical indicators can not reach the indicators given in the product manual. Therefore, the necessary samples must be tested for the selected products. When it is indeed a product quality problem, the best way is to replace the product, rather than dismantling and repairing it. In addition, the most common problems are due to improper adjustments to the equipment. For example, the adjustment of the camera's back intercept is a very delicate and precise task. If the adjustment is not carried out carefully, problems such as poor focusing or defocusing during various operations of the three variable lens will occur. In addition, whether the positions of some switches and adjustment knobs on the camera are correct, whether they meet the technical requirements of the system, whether the decoder coding switch or other adjustable parts are set correctly will directly affect the normal use of the device itself or the normal performance of the entire system .
4. The problem caused by the incorrect connection between the device (or component) and the device (or component) will generally occur in the following aspects:
â‘´ Impedance does not match.
⑵ The communication interface or communication method does not correspond. This situation mostly occurs between the control host and the decoder or control keyboard and other devices with communication control relationships, that is, the selected control host and decoder or control keyboard are not caused by a manufacturer's product. Therefore, the products of the same manufacturer should be selected for the host, decoder, control keyboard, etc.
⑶ The driving capacity is not enough or exceeds the specified number of device connections. For example, some picture splitters have an alarm input interface. In their product manuals, the system host connected to the alarm probe, long delay recorder, etc. is connected to form a system. If the alarm probe is connected to the alarm of the picture splitter At the input, the alarm signal of the probe will drive both the alarm host and the picture splitter. In this case, the problem of insufficient driving capacity often occurs. The phenomenon shown is that although the picture splitter can alarm, the input alarm signal is weak and the work is stable, resulting in the image of the camera corresponding to the alarm signal being converted to a full-screen image on the monitor. But it is lost (cannot be kept), and the image on the monitor is still the multi-screen before the alarm.
Solutions to problems similar to the above:
One is to connect the signal of the alarm probe to the picture splitter or video switching host through a dedicated alarm interface box. Second, when there is no alarm interface box, you can design and process the signal expansion device or drive device yourself.
The problems mentioned above will also appear in the output and distribution of video signals.
Frequently Asked Questions of Public Broadcasting System 1. Amplifier output overload
a. Check the circuit for short circuit.
B. Check whether the speaker impedance is consistent and whether there is a short circuit.
C. Check whether the input voltage is normal.
Frequently Asked Questions for Alarm System 1. The alarm signal cannot be disarmed.
A. The wire end resistance is not connected properly or the connection is incorrect.
B. Is the input line short-circuited (open)?
C. Whether the probe works normally.
2. No alarm
a. Is it armed?
B. Whether the arming programming is correct.
C. Can you hear the action sound of the probe or the meter in the alarm host.
1. In video transmission, the most common fault phenomenon is that a black bar or white bar appears on the screen of the monitor, and it slowly scrolls up or down. Therefore, when analyzing this type of fault phenomenon, it is necessary to distinguish between two different causes of the fault.
To distinguish between the problem of power supply and the problem of ground loop, a simple method is to connect only the output signal of a camera with no power problem to the control host. If the above interference phenomenon does not appear on the monitor , It means there is no problem with the control host. Next, you can use a portable monitor to connect to the video output of the front camera, and check each camera one by one. If there is, deal with it. If not, the interference is caused by ground loops and other reasons.
2. Wood-like interference appears on the monitor. The appearance of such interference will not overwhelm the normal image when it is slight, and the image cannot be viewed when it is severe (even destroying the synchronization). The reasons for this failure phenomenon are many and complicated. There are roughly the following reasons:
⑴ The quality of the video transmission line is not good, especially the shielding performance is poor (the shielding network is not a good quality copper wire network, or the shielding network is too thin to play a shielding role). At the same time, the line resistance of this type of video cable is too large, so that the signal is greatly attenuated is also the cause of the increased failure. In addition, the characteristic impedance of this type of video cable is not 75 Ω and the parameter is beyond the specification is also one of the reasons for the failure. Because the above-mentioned interference phenomenon is not necessarily a failure caused by a bad video line, the cause of this failure must be accurate and cautious in judgment. Only after excluding other possibilities, can we consider from the perspective of poor video line. If it is really a cable quality problem, the best way is of course to replace all such cables and replace them with cables that meet the requirements. This is the best way to completely solve the problem.
(2) Caused by the power supply system's power supply not being "clean". The power supply here is not "clean", which means that the interference signal is superimposed on the normal power supply (50-cycle sine wave). The interference signals on this kind of power supply mostly come from the equipment using SCR in this power grid. In particular, high-current, high-voltage thyristor equipment has a serious pollution on the power grid, which results in the power supply in the same power grid not being "clean". For example, there are high-power thyristor frequency and speed control devices, thyristor rectifiers, and thyristor AC-DC converters in the power grid, which will pollute the power supply. The solution to this situation is relatively simple, as long as the entire system uses purified power or online UPS power supply can basically be solved.
(3) There are strong interference sources near the system. This can be judged by investigation and understanding. If this is the reason, the solution is to strengthen the shielding of the camera and ground the video cable.
3. The failure caused by short circuit or open circuit of the core wire of the video cable and the shielding network. The manifestation of this kind of failure is that a deep and chaotic large-area network interference is generated on the monitor, so that the image is completely destroyed, and the image and the synchronization signal cannot be formed. This situation often occurs on BNC connectors or other types of video connectors. That is to say, when this kind of fault phenomenon occurs, it is not always that the signals of all channels of the entire system are faulty, but only appears on the channels with bad connectors. As long as the joints are carefully checked one by one, it can be solved.
4. Failure phenomenon caused by mismatch of characteristic impedance of transmission line. The manifestation of this phenomenon is that there are several vertical bars with equal spacing on the screen of the monitor. The frequency of the interference signal is basically an integer multiple of the line frequency. This is due to the impedance mismatch caused by the characteristic impedance of the video transmission line not being 75 Ω. It can also be said that this interference phenomenon is caused by the combination of the characteristic impedance and distribution parameters of the video cable that do not meet the requirements. The method of solution is generally solved by the method of "start-end series resistance" or "terminal-parallel resistance". In addition, it is worth noting that when the video transmission distance is very short (usually within 150 meters), the use of the above-mentioned impedance mismatch and distribution parameters of the video cable is too large will not necessarily cause the above-mentioned interference phenomenon.
5. Space radiated interference introduced by the transmission line. Most of this interference phenomenon occurs because there are strong, high-frequency spatial radiation sources near the transmission system, system front end, or near the central control room. One solution to this situation is to understand the surrounding environment when the system is established, and try to avoid or stay away from the radiation source; the other method is to strengthen the shielding of the front end and central equipment when the radiation source cannot be avoided. The pipeline of the transmission line is made of steel pipe and well grounded.
The fundamental solution to the above problem is to ensure quality when purchasing video cables. If necessary, the cable shall be sampled and tested.
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