... 2 Level. PrincipleFigure 1 illustrates principle wiring diagram of JS type counter. Figure 1 (a) is for the ... basic structure of JS type counter, the so-called double valve chip structure. ... Figure 1 (b) is for the structure of the JS-8 type counter, which is the rectifier type structure. ... arrester with 6.0 to 330 kV system, JS-8A type counter can be used for the lightning ...