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Measurement of residual magnetism

Ron Rompen

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#1
We are having a disagreement at our company on how to measure/report residual magnetism, using a Magnaflux 10 gauss field meter (this is the analog style gauge that most of us are familiar with)

My understanding is that when scanning and evaluating the sample, you report the maximum range of movement of the needle, whether it swings to the left, or to the right of the '0' point. If the needle swings to BOTH sides as you scan the surface, you report the total range of movement (similar to T.I.R. measurement). However, some of my colleagues here disagree, and feel that I should report only the MAXIMUM deflection in one direction.

Example: Scanning the surface of the part, and the needle initially moves CCW to 7 gauss. Scanning further around the surface, and the needle now moves CW past 0, to 5 gauss.

Is the reported range 7 or 12 gauss?
 
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