Just as an addendum to this, in the training I received it is necessary to omit the earth bond test in some tests, such as those where there is no metal to connect the clip to, and these are considered perfectly legitimate and complete tests.
On a couple of Class 1 laptop PSU's I have tested, I clipped my earth bond lead to the outer of the DC connector and had a good earth.
jonathan wrote:I have just read on another forum regarding testing laptop PSU blocks that they should be regarded as Separated extra low voltage (SELV) and only require a visual inspection.
In the same post they also warn that performing a 250 or 500v test could pop the rectifier diodes inside the PSU.
Jim Wallace wrote:Some PSU have continuity between the protective earth pin in the mains plug and one pole of the DC jack.
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