如何测量光电二极管的好坏（How to measure the quality of photoelectric diode）.docVIP

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如何测量光电二极管的好坏（How to measure the quality of photoelectric diode）.doc

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如何测量光电二极管的好坏（How to measure the quality of photoelectric diode）

如何测量光电二极管的好坏（How to measure the quality of photoelectric diode） There are many kinds of photodiodes, which are widely used in infrared remote control circuits. To reduce visible light interference, a black resin package is often used to filter light below 700nm wavelength. The photodiode often makes a mark angle to the rectangular tube, indicating the direction of the smooth surface. Under normal circumstances, the length of the foot is positive. The tube core of the photodiode is mainly made of silicon. Photodiode is commonly used in English abbreviation PD to express. There are three ways to measure photodiodes. (1) resistance measurement: use multimeter R x 100 or R * 1K block. Like an ordinary diode, the forward resistance should be about 10K. When the light is irradiated, the reverse resistance should be an unknown, then let the photodiode see the light, and the stronger the light, the smaller the reverse resistance. When the light is very high, the reverse resistance can be reduced below 1K. Such a pipe is good. If the positive and negative resistances are either zero or zero, the pipe is shown to be bad. (2) voltage measuring method: the multimeter (pointer) is connected to the DC 1V or so. The red pen is connected with the photoelectric diode, the black probe is connected to the anode, in the sun or incandescent lamp irradiation, the voltage and the light intensity is proportional to the average of up to 0.2~0.4V. (3) the current measurement method: the pointer multimeter dial in DC 50 A or 500 A block, the red pen is connected with the photoelectric diode, the black probe is connected to the anode, in the sun or incandescent light, short circuit current can reach tens to hundreds of microamperes 2 how can different kinds of diodes be replaced?: 1, the detection diode replacement, detection diode damage, if not the same type of diode replacement, but also can choose the same semiconductor material, the main parameters close to the diode to replace. Under ama