It's just badly worded. The "calibrator" will be simulating an RCD disconnecting after x ms, and checking that the equipment under test registers that time ± the allowed margin.
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"Unlikely" since I would have thought that it would be extremely difficult to produce a 'box' that would do that - at least, for a sensible price.Why is that unlikely? How else could the meters stated disconnection times be checked and verified.
Have you ever seen the prices of those "boxes"?"Unlikely" since I would have thought that it would be extremely difficult to produce a 'box' that would do that - at least, for a sensible price.
Of 30mA yes, but not of the applied 31.50mA.And if, e.g., "30mA" has a tolerance of 1.5mA, surely that means an acceptable value is 28.5 - 31.5mA, so how is 32.15mA a pass?
Which ones - all of those look to be well within the specification.
In that case the entire document is misleadingly laid out.It is confusing, but I assume what they are saying is that the 1.5mA tolerance is around their 'applied current' of 31.5mA (not the nominal 30 mA) - so that the result would be a 'pass' if the observed current was in the range 30.0 - 33.0 mA - hence 32.15 is a 'pass'.
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