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The measurement of dielectric properties of insulating materials is a continuing challenge because new materials with decreasing loss levels are being provided for new applications which also require increasingly precise knowledge of dielectric parameters for efficient system design.
The needle test in some of its variations has been developed to the point where it provides reliable and reproducible quantitative data on the resistance of materials to dielectric failure due to isolated partial discharge initiated at the tips of very sharp electrodes. However, it is still attacked on the basis that its results are not meaningful. That is, they are not valid in evaluating materials...
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