Which is probably why the meter is so expensive, because to be any good it needs to be at least True RMS. Also, it was a good excuse for me to buy a good clamp meter at the same time… and I was truly fed up with the situation by that point.
Oh I probably screwed up the terminology. Not that there is agreed-upon terminology. It is essentially an RCD with some resistance to nuisance tripping. It will ignore those little transients above 20mA and only trip if the energy value exceeds something dangerous.
Now for the people still reading these essays… if you’re going to make a study of what RCD to buy, you are going to find out that RCDs come in types. Type-AC is the cheap one which is really no good for a modern home anymore. Type-A is what you should use at least.
But then you also get type-S (with a delay, not allowed for use in a house, for selectivity in larger installations).
You get type type F, which is a good one to have if you have deep pockets. And you get type B which is essentially unaffordable.
But the good news is that many manufacturers make transient/impact/surge/whatever resistant RCD’s within the type-A bracket.
Hager calls theirs “HI” (high immunity). ABB calls it “type A-APR”. Gewiss calls it “Impulse Resistant”, type IR. I had to look all of these up, because I know they exist, but I forget the names… hence me butchering the term. I was probably thinking of Gewiss’s name for it.