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It showing a “noise” sign when live testing sockets for some reason. Sometimes it does it and sometimes it doesn’t just think it’s weird.

Never knew tester could pick up signals from cables

Anybody familiar with this sign on a tester. FA20882B-195A-4752-A1E3-F98F11C07EC3 - EletriciansForums.net
 
Yes electrical noise can affect results when using low-current anti-trip test methods, if it displays this symbol you should use the high current test instead as the results may be incorrect.

It’s all in the manual for the tester:
Anybody familiar with this sign on a tester. DB978A54-5DB7-46FF-ADF6-E930D93C54D9 - EletriciansForums.net
 
It usually comes up on low current ZS testing when other circuits are drawing a load shared by the same rcd.
Yes it’s very annoying.
 

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