How to test the constant current driver of the multimeter
Power on the autotransformer, then adjust the transformer output voltage according to ±10% of the rated voltage of the driver, and observe whether the output current of the constant current driver changes. The output current of a good constant current driver is constant.
Test the quality of the IC can be like this, first take a look at the IC pin information, prepare one more normal IC, test its PN knot with the watch, that is, set the watch to the file with the word diode (the one that will ring when the pen is short), and test the difference between each pin on GND and normal IC.
Led constant current board can be repaired separately, to judge whether the constant current plate is good or bad can disconnect the load to see if the power supply is normal, abnormal power supply means that the constant current plate is broken and needs to be replaced. The repair process is as follows: measure the impedance of the input with a multimeter and then measure the impedance of the output. If the impedance is greater than 1K ohms.
The multimeter can not be measured, so we can only simply test whether the input and output are short-circuited. If it is the simplest resistance-capacitance constant current source, you can test whether the capacitor is short-circuited, as long as the capacitor is not short-circuited, connected to the led lamp string, the power will be on.
A variable resistor and a fixed resistor are connected in series to make a fake load. when the resistance value of the variable resistor changes, the voltage on the fixed resistance is basically unchanged, which shows that the function of the constant current driver is normal.
How to measure the quality of led driver with multimeter: how to measure the quality of LED driver chip with multimeter? I don’t know if you are talking about LED unit board or LED driver chip. Generally, you can compare the voltage of the same pin of the normal driver chip, the resistance parameters, and the on-off test to see if the short circuit, short circuit.
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How to measure led driver with multimeter, how to measure LED driver chip with multimeter? _ Baidu.
The voltage of non-isolated LED power supply under no-load condition is about 300V tested by multimeter and about 220V with current-by-current PFC. The isolated LED power supply, the voltage in the no-load state is tested with a multimeter, and the total voltage is about 3-5V more than the rated number of LED series.
It is impossible to measure the quality of LED with ordinary pointer multimeter, because the working voltage of LED is about 7V, while the internal voltage of ordinary pointer multimeter is only 5V, so when measuring LED with the resistance file of ordinary multimeter, its forward and reverse resistance is infinite.
I don’t know if you are talking about LED display unit board or full-color LED driver chip. Generally, you can compare the voltage of the same pin of the normal driver chip, the resistance parameters, and the on-off test to see if the short circuit, short circuit. The most important thing is to be familiar with the function and routing mode of each driver chip on the unit board.
The multimeter can not be measured, so we can only simply test whether the input and output are short-circuited. If it is the simplest resistance-capacitance constant current source, you can test whether the capacitor is short-circuited, as long as the capacitor is not short-circuited, connected to the led lamp string, the power will be on.
How to use the multimeter to check whether the driver of the led lamp is good or bad?
Use a multimeter to measure the output voltage of the driver. If the value of the test is the same as that marked on it, the driver is good. Otherwise, the drive is broken. The performance of a broken led drive.
If there is no output voltage under no load, the power supply must be broken.
And determine the cathode and anode of the lamp beads. Adjust the gear of the multimeter to the transistor position. Connect the universal red pen to the anode and the black pen to the cathode. If the light is on, it means that the lamp bead is good. If the lamp beads are not bright, change the position of the red and black pen and test again, it is still not bright, which means it is broken.
If there is no light in the two measurements, it means that the LED has been damaged in the open circuit, and if the values measured in both times are very small or the value in one time is very small, the LED is damaged.
Use the diode gear of the multimeter to measure, the red meter pen connected to the positive pole of the LED lamp, and the black meter pen connected to the negative pole, which shows that the LED lamp is good, otherwise it is bad.
Distinguish between the anode and cathode of the lamp bead, as shown in the following figure. Adjust the multimeter gear to the transistor file, as shown in the following figure. The multimeter red pen is in contact with the lamp bead anode contact body, and the multimeter black pen is in contact with the cathode contact body. See if the lights are on.
