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RCD S type testing

Sparkymania
Hi all


I was using the RCD S type test on a Megger MFT1711.


It does a 30 second countdown from when the test button is pressed before doing the test. This seems to have no function at all. Although you can bypass this delay by pressing the test button again I still don't see what this delay would do.


Any thoughts on this?



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    Okay, that makes sense about the timer circuit being given time to reset after the pretest, otherwise it will include the pretest current in the timers start time, but I'm surprised that it needs 30 seconds. I would have thought it would reset within at least 5 seconds.

    Mind you, the fact that this is recognised by different manufacturers at 30 seconds shows that this must be an issue.

    I wonder why you can bypass this delay by pressing the test button again if you need 30 seconds delay between the pretest and actual test.

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    Okay, that makes sense about the timer circuit being given time to reset after the pretest, otherwise it will include the pretest current in the timers start time, but I'm surprised that it needs 30 seconds. I would have thought it would reset within at least 5 seconds.

    Mind you, the fact that this is recognised by different manufacturers at 30 seconds shows that this must be an issue.

    I wonder why you can bypass this delay by pressing the test button again if you need 30 seconds delay between the pretest and actual test.

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