I'm currently investigating the livelihood of a laptop adaptor and I noticed, unlike another adaptor it drops voltage to almost zero after I also attempt to measure its current [while it did show voltage at first, before measuring current]. The other adaptor normally shows voltage and then normally shows some current and then if it turns to measure voltage, it shows it normally again.

I assume the adaptor is faulty, however, I want to make sure if laptop adaptors turn off themselves if they aren't used normally by a laptop.