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The photoelectric effect judgment method still ICIll optocoupler detection of the fiber optic manufacturer in china.For example, set the multimeter inch: Rxlk power block, the two leads were connected to the output of the optocoupler ④, ⑤ feet, and then use a 1.5V battery and after a 50-100 ohm resistor in series with the battery's positive terminal connected to PC111 ① feet touch the negative terminal connected to ② feet, or pick ① feet touch the positive terminal and negative termination ② feet, then observed on the output multimeter pointer deflection. If the pointer swings, indicating optocoupler is good, if you do not swing, then the optocoupler is ruined. The larger the swing meter pointer deflection angle, indicating that the higher photoelectric conversion sensitivity. best fiber optic cable
 
The main difference between universal and Darlington type optocoupler current amplification factor is different from the receiver tube. The former hFE for several times to several hundred times, the latter up to several thousand times, a difference of 1 to 2 orders of magnitude. Therefore, if an accurate measurement of the hFE value, can be distinguished. In the measurement should note:
(1) Because the high hFE value Darlington type optocoupler, so hands deflected twice the number of cells is very close. Accurate readout n1, n2 the number of cells is essential for this method, otherwise it will lead to large errors. In addition, the ohmic 0:00 alignment should advance.
(2) If the 4N30 launch tube is destroyed, but the receiver tube did not find fault, you can replace the use of ultra-β tube. Similarly, if the 4N35 receiver tube intact, but also for ordinary silicon NPN transistor for use, and waste utilization. Buy fiber optic patch cord
(3) For non-universal base lead and the Darlington type optical coupler, the method is no longer applicable. Suggested a distinction between the measured current transfer ratio CTR approach.
 

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