可控硅测试(国外英文资料).docVIP

可控硅测试(国外英文资料) SCR test.Txt life, is used to operate, rather than used to care about. Love is used to hold, not to test. Love is for love, not for hurt. Money is for enjoyment, not for measure. Lies are used to break, not to decorate. Trust is for precipitation, not for challenge. The unidirectional thyristor is composed of three PN junction semiconductor materials, and its basic structure, symbol and equivalent circuit are shown. Silicon controlled rectifier has three electrodes: anode (A), cathode (K) and control pole (G). From the point of view of an equivalent circuit, the anode (A) and the control pole (G) are two PN junctions in series, and a PN junction is between the control pole (G) and the cathode (K). According to the unidirectional conduction characteristics of PN junction, the pointer multimeter resistance profile selection appropriate, test between forward and reverse resistance (the same poles, two probe resistance is measured by the exchange), for normal SCR, G, K between positive and negative resistance difference; positive and negative resistance between G and K A respectively with the difference is small, the resistance is great. This test result is unique, and the polarity of the thyristor can be determined according to this uniqueness. With a multimeter measuring R * 1K file SCR is reverse resistance between the electrodes, which is a very big difference between the two reverse resistance, in which the measured resistance measurement of small, black pen are connected to the control electrode (G), the red pen is connected to the cathode (K), left a pole as the anode (A). By determining the polarity of SCR, the quality of SCR can be qualitatively determined. In the test, any positive and negative resistance between any two poles is controlled by silicon. Two kinds of one-way silicon controlled rectifier and bidirectional thyristor are all three electrodes. The unidirectional thyristor has a cathode (K), an anode (A) and a control pole (G). The bid