How to measure the circuit board of LED flashlight with Multimeter?
Use the multimeter to measure, should pay attention to the personal and equipment safety, the test shall not be part of the touch pen metal by hand, do not allow the charged switch switch, to ensure accurate measurement, to avoid the occurrence of accidents such as electric shock and burn instrument.Current universal table file diode is small, can determine the ordinary flashlight strawhat LED is good or bad, but need 1 to 1 led were measured, can not distinguish positive and negative, change before and after the 2 pens are not bright for LED damage.You can use the voltage file to measure the battery voltage, after removing the battery problem. The battery voltage is very low and the charging is not in progress. The battery and charging circuit are emphatically investigated.All of the above normal, check the line has no short circuit, open circuit, weld, and take the wrong order of positive and negative light.
When measuring the resistance of a circuit, the power supply of the circuit under test must be cut off and the live measurement shall not be carried out.
Measurement of resistance, in the selection of the appropriate rate of stalls, two pens together so that the pointer refers to zero, such as pointer deviation from zero, regulation should be "zero" knob, the pointer to zero, to ensure accurate measurement results. If you can not adjust the zero or digital display issued a low voltage alarm, should be promptly checked.
1, before use should be familiar with the multimeter functions according to the object being measured, the correct selection range and test gear, jack.2, when the size of the measured data is unknown, the range switch should be placed at the maximum value, and then switched from a large amount to a small shift, so that the instrument pointer can be indicated at the full scale of 1/2 or more.
