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295型晶体管直流参数测试表(简称295表)结构紧凑、操作简便,多数修理员均已具备且相当熟悉。但因该仪表属普及产品,电路力求简化,有些参数只能近似测量。如能了解,做到心中有数,方能运用自如。本文从实用的角度说点体会。电路原理如图1所示。 1.概述 (1)反压击穿电压V_(BR)的测试:分“×1”(20V)、“×10(200V)、“×100”(2000V)三档。系半定流法测量,其中20V和200V档的击穿电流(漏电流)约0.8mA
295-type transistor DC parameter test table (referred to as 295 table) compact, easy to operate, most repairmen have been and are quite familiar with. However, due to the popularity of the instrument products, circuit simplification, some parameters can only approximate measurement. If you can understand, be aware of, can use freely. This article from a practical point of view experience. Circuit shown in Figure 1. 1. Overview (1) Test of back-pressure breakdown voltage V BR: Divide “× 1” (20V), “× 10 (200V),” × 100 " , Of which 20V and 200V file breakdown current (leakage current) of about 0.8mA