The electrical parameters mainly include forward and reverse voltages and reverse currents. It is related to whether LED lamps can work normally. It is one of the basis for judging the basic performance of LED lamps. There are two kinds of electrical parameter measurement of LED lamps: test voltage parameters when the current is constant; test current parameters when the voltage is constant. The specific method is as follows:
(1) Forward voltage
A forward current is applied to the LED lamp to be detected, and a voltage drop is generated across the two ends. Adjust the current value to determine the power supply, record the relevant reading on the DC voltmeter, which is the forward voltage of the LED luminaire. According to the common sense, when the LED is conducting in the direction of conduction, the resistance is small, and the external connection method using the ammeter is relatively accurate.
(2) Reverse current
Apply a reverse voltage to the LED illuminator being tested, adjust the regulated power supply, and the current meter reading is the reverse current of the LED illuminator under test. The same as measuring the forward voltage, because the resistance of the LED is reversed when the reverse conduction is large, the current meter is connected internally.
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