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Led which are generally led chip (device) production commercial use of rapid detection methods, but with the practical application of led lighting in the final state of reference do not haveto.the second detection method is the detection of the led module is installed on the device, it may take a fixed heat sink (temperature control may also have the base function), to exert its claim to the work of the led current, the traditional light source detection methods, writing board until the led is in thermal equilibrium and then start measuring its optical parameters. this approach appears tighter, but in fact.
to control the output current control device, the output of each circuit to minimize the number of led strings (may be left in a string of led). the digital storage oscilloscope (div) ofa channel ch1 is connected to the current sampling resistor (sampling resistor r ≥ 0.5ω, no sense of resistance), led neon sign second channel ch2 led modules connected to the voltage sampling side (upper). oscilloscope ground connection in the voltage / current measurement of public terminals.
such led watch from the output control device in, led signs output impedance has a constant voltage output than the type of led control to high, but significantly lower than control led current output-type controls. such circuits can be connected led work-limiting impedance of the smaller led can work.