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In most if not all test equipment there has to be a protection of sorts on the input to the hardware. The topic itself of circuit protection from excessive voltages and currents is vast, and there are many techniques for it, but this is an example of a proven and simple technique.. A fuse is tied to the output, so if you accidentally short the output to ground, instead of burning the inside electronics due to excessive current, the fuse "pops" first.

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