How does glow diode check with avometer? Glow diode checks a method

　　1, detect with avometer common glow diode:
A. With archives of 10k of × of R of avometer of type of pressing with a finger, measure glow diode, retrorse resistance. Normal when, to resistance (when black list pen receives positive electrode) it is about a few to 200k Ω , retrorse resistance is ∞ (infinity) . Measuring to resistance when, the glow diode of taller sensitivity, glimmer of the meeting inside the canal. If use file of 1k of avometer R × ,measure glow diode, retrorse resistance, can discover its, retrorse resistance all is close to ∞ (infinity) , because give off light,this is of diode to pressure fall to be controlled in 2V about (partial glow diode is pressed fall to be controlled in 3V, wait like white glow diode) , and the voltage value of the batteries inside archives of 1k of avometer R × is 1.5V, reason cannot shine diode guide is connected.
The file of B, R × 10k that uses avometer of type of pressing with a finger is right F/25V of a 220 μ electroanalysises capacitor charges (black list pen receives capacitor anode, red watch pen receives capacitor negative pole) , receive the capacitor anode after charging negative pole of glow diode anode, capacitor to receive glow diode negative pole again, if glow diode has very bright glitter, explain this glow diode is in good condition.
The C, direct current source that use 3V, the anode that glow diode receives after receiving resistor of a 47 Ω is strung together in the anode of power source, receive the negative pole of power source the negative pole of glow diode, normal glow diode should give off light. Or string together batteries of a 1.5V receive the black list pen in avometer (× of avometer park R 10 or 100 archives of R × , black list pen receives batteries negative pole, be equal to establish ties with the 1.5V batteries inside the watch) , receive the anode of batteries the anode of glow diode, red watch pen receives the negative pole of glow diode, normal glow diode should give off light.
D, if have two finger avometer (had better be the same as model) . With a lead general among them of an avometer ” + ” of wiring column and another watch ” – ” wiring post link. The rest of ” – ” the anode that the pen receives the glow that be measured to be in charge of (P area) , the rest of ” + ” the negative pole that the pen receives the glow that be measured to be in charge of (N area) . Two avometer all 10 Ω of buy × are blocked. Below normal circumstance, diode of the glow after putting through can give off light normally. If brightness is very low, do not give off light even, all can dial two avometer to × 1 Ω is like, if still very dark, do not give off light even, show performance of this glow diode undesirable or attaint. Should notice, cannot measure at the beginning 1 Ω of two avometer park × , lest electric current is too big, attaint glow diode.
　　 2, avometer detects infra-red glow diode
Of infra-red glow diode to pressure fall to be 1.3 ～ 2.5V commonly, can use archives of 10k of × of R of avometer of type of pressing with a finger to measure infra-red glow to be in charge of, retrorse resistor. Normal when, be 15~40k Ω about to resistance (it is good that this is worth Yue Xiaoyue) ; Retrorse resistor is more than 500k Ω . If be measured, retrorse resistance all is close to 0, explain this infra-red glow diode is in-house already puncture attaint. If be measured, retrorse resistance all is infinity, show this diode already open circuit attaint. If measure gotten retrorse resistance to be less than 500k Ω far, show this diode already attaint of leakage of electricity.
As a result of the infra-red light that infra-red glow diode shoots the person is less than soon. Besides judge PN ties stand or fall with afore-mentioned methods, had better prepare parts of an apparatus of a photosensitive (like 2CR, 2DR silicon photocell) make receiver, measure photocell with avometer the metabolic circumstance of two upright voltage. Will judge infra-red glow diode to be added whether shooting infra-red light to voltaic hind appropriately.
Of diode of glow of judgement of range estimation law, negative electrode (the common glow diode that applies to infra-red glow diode and transparent colophony to enclose)
Glow diode has two to cite a base, grow normally bring a foot to be positive electrode, short bring a foot to be negative pole. Infra-red glow diode and transparent enclosed common glow diode, the electrode clarity inside its envelope is visible, in-house electrode is a bigger wider for negative pole, and narrower and one small is positive electrode.