How do you know whether a fluorescent tube is good or bad
How do you know whether a fluorescent tube is good or bad
There is a small filament in each end of the normal daylight lamp, and the two feet on each side of the lamp are interlinked with the multimeter (only very small cold resistance). Working principle is: making after vacuum tubes when filling the silver (mercury), a small drop of water on the walls painted with fluorescent powder, the bulb is started, at the ends of the filament after heating, mercury evaporates into gas, gas is ionized conductive lines into loop, gas release a large number of ultraviolet (uv), at the same time by the ultraviolet radiation fluorescent powder from visible light. In addition, when after the lamp aging on both ends of the filament evaporation guide to black on both ends of the tube, the tube sometimes no broken cannot use the filament lamp to glow (so).
In the case of leds, there is no direct way to judge the use of a multimeter. That will be in the absence of special apparatus, find a good matching of drive, according to the manual connection method directly connected, electricity testing. It's good to lighten up. Conversely, still.
There is a good or useful ballast connecting the line, and the fluorescent tube lights up, which is normal
