First, the principle of security gate by the crystal oscillator 3.5-4.95M sinusoidal oscillation, frequency divider by 7.8K or so sine wave, after the transistor and the coil for power amplification input door (7 area) large coil electromagnetic emissions, from The coils in the 1-6 zone of the door are received separately. After receiving, the received signal is compared with the reference signal. After the change is found, the output level of the acquisition card is changed. The CPU scans the data of the 6-bit acquisition card within 300 milliseconds to determine the location of the metal and display the output. Metal gates regroup the original spherical edged, less stable magnetic field into a new, more stable magnetic field, which means that the metal gate has greater stability than other materials. This is the advantage of metal doors: with gold, increase sensitivity and stability.
Second, the structure:
1. Door structure: It consists of a large coil, 6 small coils, compensation coils and graphite. 2, the chassis structure.
Third, the detection workflow:
CPU detection → A group of infrared is blocked → Detect whether the data of each acquisition card changes → Alarm → Detect another group of infrared → Reset Redetect.
Fourth, pay attention to the use of different occasions:
1. Factory anti-theft: 1 The installation is stable, and it is recommended to install it in the area away from high-frequency equipment to avoid false alarms and serial reports. 2 rain, sun protection, outdoor installation, it is best equipped with awning and other facilities to increase the service life. 3 Try to stay away from large metal objects during installation. 4 Avoid moving nearby metal objects. 2. Entertainment venues (public places): The installation is stable and can meet the room requirements. (Stability>Sensitivity), adjust from the lowest sensitivity when adjusting.
V. Commissioning instructions:
Debugging from low sensitivity to high sensitivity, ie setting the sensitivity of the door first, unable to detect the object, no alarm, then increasing the sensitivity in a single area in order to be able to detect the required items.
Six, common problems and solutions:
1. Can detect objects: General easy to magnetic metal, that is easy to be magnet adsorption of objects, such as silicon steel, iron, copper, alloys and other objects. However, if the objects are scattered, such as powdered metals, wire-shaped metals, etc. are not easily detected. Metals can be detected on a one-dollar coin. If customer materials are special, samples can be requested for testing.
2. Frequently Asked Questions: A: Installation: Distinguish between the left and right door panels, left (4P plug), right (3P plug), firmly plugged in, cannot be reversed. B: When the alarm is not detected, check whether the intensity is always on and the infrared count is normal.
Specific issues:
(1) Do not turn on the power: 1 The power indicator light is on, and check whether the power supply in the cabinet is securely inserted. If there is no problem, check whether the fuse and the power supply circuit are connected properly. 2 If the power indicator is off, verify that the incoming line plug is firmly plugged in and the power cord is in good condition.
(2) Infrared does not count: Check whether infrared is firmly connected and whether the infrared head is covered.
(3) No alarm: 1 Strong or weak light, check whether there is interference source around, try changing the frequency of the crystal oscillator. 2 Check if the infrared is normal.
(4) Long alarm time: Check the length of the alarm and infrared count.
(5) String: Check for interference. (6) Liquid crystal gate water phenomenon: Check whether the liquid crystal panel is squeezed, loosen the screws on the liquid crystal panel.
Second, the structure:
1. Door structure: It consists of a large coil, 6 small coils, compensation coils and graphite. 2, the chassis structure.
Third, the detection workflow:
CPU detection → A group of infrared is blocked → Detect whether the data of each acquisition card changes → Alarm → Detect another group of infrared → Reset Redetect.
Fourth, pay attention to the use of different occasions:
1. Factory anti-theft: 1 The installation is stable, and it is recommended to install it in the area away from high-frequency equipment to avoid false alarms and serial reports. 2 rain, sun protection, outdoor installation, it is best equipped with awning and other facilities to increase the service life. 3 Try to stay away from large metal objects during installation. 4 Avoid moving nearby metal objects. 2. Entertainment venues (public places): The installation is stable and can meet the room requirements. (Stability>Sensitivity), adjust from the lowest sensitivity when adjusting.
V. Commissioning instructions:
Debugging from low sensitivity to high sensitivity, ie setting the sensitivity of the door first, unable to detect the object, no alarm, then increasing the sensitivity in a single area in order to be able to detect the required items.
Six, common problems and solutions:
1. Can detect objects: General easy to magnetic metal, that is easy to be magnet adsorption of objects, such as silicon steel, iron, copper, alloys and other objects. However, if the objects are scattered, such as powdered metals, wire-shaped metals, etc. are not easily detected. Metals can be detected on a one-dollar coin. If customer materials are special, samples can be requested for testing.
2. Frequently Asked Questions: A: Installation: Distinguish between the left and right door panels, left (4P plug), right (3P plug), firmly plugged in, cannot be reversed. B: When the alarm is not detected, check whether the intensity is always on and the infrared count is normal.
Specific issues:
(1) Do not turn on the power: 1 The power indicator light is on, and check whether the power supply in the cabinet is securely inserted. If there is no problem, check whether the fuse and the power supply circuit are connected properly. 2 If the power indicator is off, verify that the incoming line plug is firmly plugged in and the power cord is in good condition.
(2) Infrared does not count: Check whether infrared is firmly connected and whether the infrared head is covered.
(3) No alarm: 1 Strong or weak light, check whether there is interference source around, try changing the frequency of the crystal oscillator. 2 Check if the infrared is normal.
(4) Long alarm time: Check the length of the alarm and infrared count.
(5) String: Check for interference. (6) Liquid crystal gate water phenomenon: Check whether the liquid crystal panel is squeezed, loosen the screws on the liquid crystal panel.