1, the infrared machine series of images appear at night poor illumination, white or bright white aperture phenomenon This phenomenon is caused by improper assembly of the machine, the assembly of photosensitive devices (photosensitive resistor) from the hemisphere distance will lead to incomplete infrared lamp startup The nighttime illuminance of the machine is poor. The phenomenon of white or bright white image appears mainly due to the infrared light emitted by the infrared light emitting tube is refracted by the dome cover to the lens, to solve this phenomenon is to avoid the infrared light refracted to the lens surface, usually using a sponge/rubber ring lens and infrared For light isolation, be sure to place the cover/glass against the sponge/rubber ring during assembly to prevent light leakage; the reflection of infrared light from the rain cover will also cause this phenomenon.
2, night vision type infrared waterproof machine normal day image, whitening at night This phenomenon is generally due to the use of the machine reflector or in a very small space, due to reflection of infrared light, to resolve this phenomenon should first determine whether the use of the environment Reflectors, as much as possible to improve the use of the environment, and then check the machine's effective infrared distance and the actual use of the distance; if a long-distance infrared machine is used in a small space will be due to infrared light is too strong resulting in the machine image white. This phenomenon can also occur with a slight fog inside the steamed bread.
3, no image First check the polarity of the external power supply is correct, the output voltage meets the requirements (power error C12V ± 10%, AC24V ± 5%), then check the video connection is good contact; if you use a manual iris lens need to check the aperture is Open, auto iris lens need to adjust the LEVEL potentiometer to make the aperture in the right place
4, color distortion, color cast may be white balance switch (AWB) is not properly set, it may be too much change in ambient lighting conditions, this time should check whether the switch settings in the OFF position, should think of ways to improve the ambient light conditions.
When the monitor is bought back or after it has been used for a period of time, there will be color differences in the four corners, and sometimes the blue color will appear red on the monitor. There are two possibilities for this phenomenon on the monitor screen.
One is unrecoverable. The bad color purity is due to the distortion of the shadow mask inside the phenomenological tube. The electron beam cannot bombard the phosphor of the desired color correctly. Instead, color cast occurs. fixed.
Another phenomenon is that the degaussing problem can be repaired. When the display tube is erroneously magnetized, it also causes the electron beam to deflect when it attacks the phosphor.
5. The image appears distorted or geometrically distorted This phenomenon may be a problem with the camera or the monitor's geometry correction circuit or the problem with the optical lens, or it may be that the characteristic impedance of the video connection cable or device does not match the output impedance of the camera.
When the above phenomenon occurs, please check whether the used optical lens is abnormal and whether the monitor's input impedance switch is set to 75Ω, and then check whether the impedance of the video cable used is 75Ω.
Excessive video amplitude can also cause image distortion. The national standard video output amplitude is 1.0Vp-p.
6, the screen appears several black vertical bars or bars mixed This situation is generally the output voltage ripple of the machine power supply is too large, should strengthen the filter and the use of good performance DC power supply.
7, the use of automatic iris lens image too dark First check the EE / AI function switch is set at the AI ​​end, followed by checking LEVEL potentiometer adjustment is appropriate.
8. Bad image quality a. Check the lens for fingerprints or dirt.
b. Check if the aperture is adjusted.
c. Check for poor video cable contact.
d. Check for any problems with the electronic shutter or white balance settings.
e. Check if the transmission distance is too far.
f. Check if the voltage is normal.
g. Check for nearby sources of interference.
h. Check to ensure that the elevator is insulated from interference when installed in an elevator.
i. Check whether the CS interface is connected.
Infrared camera image is not clear:
The installation of infrared one machine often causes such problems as the image is unclear, rippled, unstable, good or bad, it will be normal, if it is dark, there will be interference, and the image will not be visible. It's a ripple and snow, but it's raining. What's going on?
(1) 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 network, or the shielding network is too thin to be shielded). At the same time, the line resistance of such video lines is too large, which causes the signal to have a large attenuation is also aggravating the cause of the failure. In addition, the characteristic impedance of this kind of video line is not 75 Ω and one of the reasons that causes the trouble is that the parameter is beyond the regulation. Since the above-mentioned interference phenomenon is not necessarily a fault caused by a defective video line, the reason for this failure should be accurate and careful when judging. Only from the point of view of the video line can be considered when other possibilities are excluded. If it is really a cable quality problem, the best way is of course to replace all of these cables and replace them with cables that meet the requirements. This is the best way to completely solve the problem.
(2) The power supply system is not "clean". The power source referred to here is not "clean," and it means that an interference signal is superimposed on a normal power source (a 50-cycle sine wave). This type of interference signal on the power supply mostly comes from devices that use thyristors in the power grid. In particular, high-current, high-voltage thyristor devices have a very serious pollution to the power grid, which leads to the fact that the power supply in the same power grid is not "clean." For example, in this power grid, there are high-power thyristor frequency modulation speed control devices, thyristor rectifier devices, thyristor AC-DC converter devices, and so on, all of which will cause pollution to the power supply. The solution to this situation is relatively simple, as long as the entire system is powered by a clean power supply or an online UPS.
(3) There is a strong source of interference near the system. This can be judged through investigation and understanding. If this is the reason, the solution is to strengthen the shielding of the camera , as well as to ground the pipeline of the video cable.
(4) The fault caused by the short-circuit and open circuit of the core wire of the video cable and the shield network. This failure manifests itself in a deep and chaotic large-area moire on the monitor, so that the image is completely destroyed and the image and synchronization signals cannot be formed. This often occurs on BNC connectors or other types of video connectors. That is, when this kind of fault phenomenon occurs, it is not always the signal of the entire system that causes problems, but only appears in the number of poorly-connected paths. As long as you carefully check these joints one by one, you can solve.
(5) The fault phenomenon due to the mismatch of the characteristic impedance of the transmission line. The manifestation of this phenomenon is that a number of vertical bars of equal spacing are generated on the screen of the monitor, and the frequency of the interference signal is substantially an integral multiple of the line frequency. This is due to impedance mismatch caused by the characteristic impedance of the video transmission line is not 75 Ω. It can also be said that this interference phenomenon is caused by the fact that the characteristic impedance and distribution parameters of the video cable do not meet the requirements. The solution to this problem is usually solved by means of "connected resistors at the beginning" or "connected resistors at the terminals". In addition, it is worth noting that when the video transmission distance is short (typically within 150 meters), using the above video cable with impedance mismatch and distribution parameters that are too large will not necessarily result in the above-mentioned interference phenomenon.
(6) Spatial radiation interference introduced by the transmission line. This interference phenomenon is mostly caused by strong, high-frequency spatial radiation sources near the transmission system, the system front-end, or the central control room. One of the solutions to this situation is to understand the surrounding environment when establishing the system and try to avoid or keep away from the radiation source; another way is to strengthen the shielding of the front-end and center equipment when the radiation source cannot be avoided. The pipeline of the transmission line adopts steel pipe and is well grounded.
Correction machine:
First, the camera "focus mode" hit MF (manual), after the machine is pulled to 1 times adjust clear, and then press and hold the menu for 3 seconds will pop up (AJDUST SUCCESS) that the calibration was successful, (AJDUST FAIL failure ); then hit 22 times and then adjust the clear (must be clear, or autofocus 22 times will not be clear), then pull 1 times off at boot. Test OK on the line, if not clear, please correct it again.
2, night vision type infrared waterproof machine normal day image, whitening at night This phenomenon is generally due to the use of the machine reflector or in a very small space, due to reflection of infrared light, to resolve this phenomenon should first determine whether the use of the environment Reflectors, as much as possible to improve the use of the environment, and then check the machine's effective infrared distance and the actual use of the distance; if a long-distance infrared machine is used in a small space will be due to infrared light is too strong resulting in the machine image white. This phenomenon can also occur with a slight fog inside the steamed bread.
3, no image First check the polarity of the external power supply is correct, the output voltage meets the requirements (power error C12V ± 10%, AC24V ± 5%), then check the video connection is good contact; if you use a manual iris lens need to check the aperture is Open, auto iris lens need to adjust the LEVEL potentiometer to make the aperture in the right place
4, color distortion, color cast may be white balance switch (AWB) is not properly set, it may be too much change in ambient lighting conditions, this time should check whether the switch settings in the OFF position, should think of ways to improve the ambient light conditions.
When the monitor is bought back or after it has been used for a period of time, there will be color differences in the four corners, and sometimes the blue color will appear red on the monitor. There are two possibilities for this phenomenon on the monitor screen.
One is unrecoverable. The bad color purity is due to the distortion of the shadow mask inside the phenomenological tube. The electron beam cannot bombard the phosphor of the desired color correctly. Instead, color cast occurs. fixed.
Another phenomenon is that the degaussing problem can be repaired. When the display tube is erroneously magnetized, it also causes the electron beam to deflect when it attacks the phosphor.
5. The image appears distorted or geometrically distorted This phenomenon may be a problem with the camera or the monitor's geometry correction circuit or the problem with the optical lens, or it may be that the characteristic impedance of the video connection cable or device does not match the output impedance of the camera.
When the above phenomenon occurs, please check whether the used optical lens is abnormal and whether the monitor's input impedance switch is set to 75Ω, and then check whether the impedance of the video cable used is 75Ω.
Excessive video amplitude can also cause image distortion. The national standard video output amplitude is 1.0Vp-p.
6, the screen appears several black vertical bars or bars mixed This situation is generally the output voltage ripple of the machine power supply is too large, should strengthen the filter and the use of good performance DC power supply.
7, the use of automatic iris lens image too dark First check the EE / AI function switch is set at the AI ​​end, followed by checking LEVEL potentiometer adjustment is appropriate.
8. Bad image quality a. Check the lens for fingerprints or dirt.
b. Check if the aperture is adjusted.
c. Check for poor video cable contact.
d. Check for any problems with the electronic shutter or white balance settings.
e. Check if the transmission distance is too far.
f. Check if the voltage is normal.
g. Check for nearby sources of interference.
h. Check to ensure that the elevator is insulated from interference when installed in an elevator.
i. Check whether the CS interface is connected.
Infrared camera image is not clear:
The installation of infrared one machine often causes such problems as the image is unclear, rippled, unstable, good or bad, it will be normal, if it is dark, there will be interference, and the image will not be visible. It's a ripple and snow, but it's raining. What's going on?
(1) 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 network, or the shielding network is too thin to be shielded). At the same time, the line resistance of such video lines is too large, which causes the signal to have a large attenuation is also aggravating the cause of the failure. In addition, the characteristic impedance of this kind of video line is not 75 Ω and one of the reasons that causes the trouble is that the parameter is beyond the regulation. Since the above-mentioned interference phenomenon is not necessarily a fault caused by a defective video line, the reason for this failure should be accurate and careful when judging. Only from the point of view of the video line can be considered when other possibilities are excluded. If it is really a cable quality problem, the best way is of course to replace all of these cables and replace them with cables that meet the requirements. This is the best way to completely solve the problem.
(2) The power supply system is not "clean". The power source referred to here is not "clean," and it means that an interference signal is superimposed on a normal power source (a 50-cycle sine wave). This type of interference signal on the power supply mostly comes from devices that use thyristors in the power grid. In particular, high-current, high-voltage thyristor devices have a very serious pollution to the power grid, which leads to the fact that the power supply in the same power grid is not "clean." For example, in this power grid, there are high-power thyristor frequency modulation speed control devices, thyristor rectifier devices, thyristor AC-DC converter devices, and so on, all of which will cause pollution to the power supply. The solution to this situation is relatively simple, as long as the entire system is powered by a clean power supply or an online UPS.
(3) There is a strong source of interference near the system. This can be judged through investigation and understanding. If this is the reason, the solution is to strengthen the shielding of the camera , as well as to ground the pipeline of the video cable.
(4) The fault caused by the short-circuit and open circuit of the core wire of the video cable and the shield network. This failure manifests itself in a deep and chaotic large-area moire on the monitor, so that the image is completely destroyed and the image and synchronization signals cannot be formed. This often occurs on BNC connectors or other types of video connectors. That is, when this kind of fault phenomenon occurs, it is not always the signal of the entire system that causes problems, but only appears in the number of poorly-connected paths. As long as you carefully check these joints one by one, you can solve.
(5) The fault phenomenon due to the mismatch of the characteristic impedance of the transmission line. The manifestation of this phenomenon is that a number of vertical bars of equal spacing are generated on the screen of the monitor, and the frequency of the interference signal is substantially an integral multiple of the line frequency. This is due to impedance mismatch caused by the characteristic impedance of the video transmission line is not 75 Ω. It can also be said that this interference phenomenon is caused by the fact that the characteristic impedance and distribution parameters of the video cable do not meet the requirements. The solution to this problem is usually solved by means of "connected resistors at the beginning" or "connected resistors at the terminals". In addition, it is worth noting that when the video transmission distance is short (typically within 150 meters), using the above video cable with impedance mismatch and distribution parameters that are too large will not necessarily result in the above-mentioned interference phenomenon.
(6) Spatial radiation interference introduced by the transmission line. This interference phenomenon is mostly caused by strong, high-frequency spatial radiation sources near the transmission system, the system front-end, or the central control room. One of the solutions to this situation is to understand the surrounding environment when establishing the system and try to avoid or keep away from the radiation source; another way is to strengthen the shielding of the front-end and center equipment when the radiation source cannot be avoided. The pipeline of the transmission line adopts steel pipe and is well grounded.
Correction machine:
First, the camera "focus mode" hit MF (manual), after the machine is pulled to 1 times adjust clear, and then press and hold the menu for 3 seconds will pop up (AJDUST SUCCESS) that the calibration was successful, (AJDUST FAIL failure ); then hit 22 times and then adjust the clear (must be clear, or autofocus 22 times will not be clear), then pull 1 times off at boot. Test OK on the line, if not clear, please correct it again.