Detection of laser diode

(A) determine the pin order of the multimeter to put R × 1K block, in accordance with the detection of common diode positive and negative resistance method, can be laser diode of the pin in the order determined.



But the test should pay attention to, the laser diode 's forward voltage drop larger than the ordinary diode, so when testing positive resistance , the multimeter pointer deflection only slightly to the right only, while the negative resistance was infinite.

(B) of the laser diode is generally worse in the detection of laser diode power supply circuit is set up a load resistor . Detection can be used Multimeter dc voltage measurement block about this load resistor the voltage drop, then Ohm I =? to estimate the stream of laser diode current , then current size accordingly to determine the working status of laser diodes. General when the current is greater than 100mA, and regulator circuit of the corresponding potential, current without any change, you can conclude that laser diodes have been damaged. Because the current low-power laser diodes are rated at 100mA operating current below the damage occurred only in the cavity of failure to appear and can not control the current surge in the phenomenon. Incidentally, the wavelength of 780nm laser diodes at work, watching the light from the side window Chenganhongse, when viewed from the side lens slightly glow. These laser diodes can be the basis for determining whether the work of the basic features.