How to detect the flashlight LED lamp is good or bad?
It may be because the measurements in the plate, 6 beads in parallel, and the meter provide insufficient measurements of current shunting. Well, after the 2 1.5V batteries are connected in series, measure directly, or measure the resistance of the mobile phone battery string 50, or measure the resistance of the charger with a 100 ohm charger.As long as the measurement voltage is controlled at about 3V DC or the current under DC 20mA is measured, the results can be obtained directly in the plate measurementPut aside
Very sure. Both the 200 and diode files can be measured directly, and LED has been doing so. But if you connect together the series resistance measurement, the superfluous. LED is different from ordinary diodes, but not everyone knows nothing about it.This is your hat bright LED, current parameters 20mA, mA of the few chips to judge the quality of light is LED.
If you can confirm in advance LED negative, one measurement can be judged: the red pen is connected with the positive (pointer instead), the black one to the negative electrode, the light is good, bad is not bright. When measuring, pay attention to reliable contact
