First, the principle of security doors
Sinusoidal oscillation 3.5-4.95M by crystal frequency divider by about 7.8K sine wave, the transistor and the coil power amplifier input door (District 7) large coil electromagnetic wave emission from the door 1-6 area receiving coil respectively. After the reception, the received signal and the reference signal are compared and found that after the change, change capture card output level, CPU within 300 milliseconds of the six regional acquisition card data is scanned to determine the metal where the location and output display. (On metal doors have better stability and sensitivity of the issue was purely a company Chaozuo behavior, metal door in a bad situation under the regulation easier to go wrong)
Second, the structure
1, door structure: from a large coil, 6 small coil, compensation coil and graphite.
2, chassis structure: the power supply board, display panel, motherboard, capture cards and other components.
Third, the detection workflow CPU detection →Whether a group is blocked → detected infrared capture card data changes →Alarm →Another group of infrared detection probe → reset again.
Four different occasions Precautions
A factory anti-theft:
① installation firm, try to recommend installed in an area away from the high-frequency device to relieve interference generated false positives, string newspaper.
② rain, sun, outdoor installation, preferably with awning and other facilities to increase the service life.
Try to stay away from large metal objects when ③ installation.
④ avoid moving metal objects nearby.
2, entertainment (in public places): installation firm, to meet the requirements of rooms. (Stable> sensitivity), when adjusting from the lowest
Sensitivity adjustment.
Five, commissioning guidance: from low sensitivity to high sensitivity testing, the first door that low sensitivity setting, can not detect the object, no alarm
When the date, and then in turn heightened sensitivity area, to be able to detect the requirements of articles can be.
Six common problems and solutions:
1, can detect objects: general easy-magnetic metal that is easily attracted by the magnet objects, such as steel, iron, copper, alloy and other objects.
However, if the objects scattered, such as powdered metal, metal wire and so difficult to detect. Metal can be detected with a dollar coin as a standard, such as passenger
Special household materials may be required to provide samples for testing.
Frequently Asked Questions:
A: Install, to distinguish between right and left door, left (4P plug), the right (3P plug), plug firmly, not anti-loaded.
B: No alarm Always check whether the strength of the infrared count is normal. (This provision for the head of the family of God, some manufacturers have copied this casually, but there is nothing they infrared door plug wire to be inserted)
Specific issues:
(1) can not boot:
① power indicator light, test the power box is plugged in firmly, without question, part inspection fuse and power line is normal
Connection.
② power indicator is not lit, verify whether the plug is inserted into the line aviation firm, the power cord is good.
(2) does not count Infrared: Infrared Inspection is firmly seated, infrared head whether occlusion.
(3) No alarm:
① strength Always, if there is interference source around the test, try changing the frequency conversion crystal.
② infrared inspection is normal.
(4) the alarm for a long time: a long set and infrared inspection alarm when the count is normal.
(5) string pole: check whether there is interference.
(6) LCD door water phenomenon: Verify whether the LCD panel is pressed, the LCD panel after loose screws.