LED Module

If there are two pointer multimeter ( preferably the same model ) can better check emitting   LED Bulb  diode emitting situation . Which will be a wire with a multimeter on the "+ " terminal and the other a statement of the " - " terminal connection. The remaining " - " pen then tested positive light tube (P area ) , the rest of the "+" LED pen then tested negative (N region ) .

LED Module

Two multimeter are set × 10Ω blocked. Under normal circumstances, normal light can be switched on . If the brightness is very low, not even light , can be two to × 1Ω multimeter are capitalized if , if still very dark , not even light, then the poor performance of the light-emitting diode or damaged. Should be noted that it will not begin to measure two multimeter in × 1Ω, in order to avoid excessive current , damage to the light emitting diodes.

( 2 ) external power measurements. With 3V voltage source in series or two batteries and a multimeter ( Analog or digital can ) can be more accurately measure the light emitting diode , electrical characteristics .

  LED Flexi Strip

 This may be connected to the circuit shown in Figure 10 can be. If the measured VF in between 1.4 ~ 3V , and the brightness is normal, can explain the glow is normal. If the measured VF = 0 or VF ≈ 3V, without light, the light-emitting tube is bad .