Explain why the guard voltage come into play

Reference no: EM13118325

Why do we place guards over capacitors and where does the guard voltage come into play when using an analogue L-C meter to probe the capacitance?

For instance, we have an isolated spherical capacitor on an insulating rod with a conducting base. Why do you get the most accurate vale for capacitance when applying a guard voltage to the base and then probing the sphere instead of grounding the base or doing neither?

Reference no: EM13118325

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