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The Complete Guide to Electrical Insulation Testing· PDF fileFigure 4–Typical record of insulation resistance of a mill motor. Curve A shows test values as measured; Curve B shows same values corrected to 20°C (see page 22), giving a definite downward trend toward an unsafe condition. Reverse side of card (at right) is used to record the test data. Figure 3–Typical scale on the Megger insulation tester.

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