Case study

The electric current is normally supposed to flow on Route A and it does flow there in the early period of use of a probe.However, as probes make strokes, friction occurs between the bushing and the probe body (shaft). The friction produces high resistance at the rubbed point where the current is supposed to flow normally.

下やじるし

As a result, the current goes into the spring which has low resistance.

When the current flows on Route B for a long time, the spring comes to be fragile. This is because the heat from the electric charge works in the same way as annealing and quenching the spring. If the spring was forced to move at the moment, it can easily break.

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