In general, especially in the initial lighting stage power LED luminosity will have a certain attenuation, LED packaging plant in order to provide the application side to the light emitting stable product manufacturer, vendor or the application side in order to obtain a stable home LED materials, usually Do some aging tests. Of course, LED aging tests can be performed in a variety of ways, such as conventional aging, overcurrent shock destructive tests, and the like.
LED manufacturers typically perform conventional aging in several ways:
1, multiple tubes in series aging: constant voltage aging circuit and constant current aging circuit
2, multiple tubes connected in parallel
3, multiple tubes in series and parallel aging: string and constant pressure aging and series and constant current aging
4, single tube constant current aging
Comparing the above four kinds of aging methods, as long as one LED has quality failure in one or three ways, such as LED short circuit or open circuit will affect the working current parameters of other LEDs. The second method is better than 1, 3 kinds. Any change in LED characteristics will not affect other LED aging parameters, but in fact, the method of resistor current limiting is unreliable, the resistance of the resistor itself drifts and the voltage of the LED itself. Changes in characteristics can seriously affect the LED parameters. Obviously, the fourth single-tube constant current aging captures the LED current operating characteristics and is the most scientific LED aging method.
Aging should be a very important process in the test process, but in many enterprises, it is often neglected and cannot be properly and effectively aged. The analysis of all parameters including brightness, wavelength, etc. performed by the LED itself will be uncertain. . Over-current impact aging is also an aging method often used by manufacturers. It is usually used for constant temperature sources with adjustable frequency, adjustable current and adjustable duty cycle. It is expected to judge the quality and expectations of LEDs in a short time. life.
Fiber patch cords are used to make patch cords from the device to the fiber optic cabling link. There is a thick protective layer, which is generally used in the connection between the optical transceiver and the terminal box, and is applied in some fields such as a fiber-optic communication system, a fiber access network, an optical fiber data transmission, and a local area network.
Optical fiber jumpers (also known as fiber optic connectors) are connectors that are attached to both ends of the cable.
It is used to realize the optical path active connection; the plug at one end is called the pigtail. Optical Fiber Patch Cord/Cable is similar to Coaxial Cable except that there is no mesh shield. The center is the glass core of light transmission. In a multimode fiber, the core has a diameter of 50 μm to 65 μm, which is roughly equivalent to the thickness of a human hair. The single mode fiber core has a diameter of 8 μm to 10 μm. The outer periphery of the core is surrounded by a glass envelope having a lower index of refraction than the core to retain the fiber within the core. Next to it is a thin plastic jacket to protect the envelope.
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