It's many questions that little GDT raises, RIP. I understand multimeter protection circuits and 61010 well enough to get equipment designs certified.
The Sanwa PM300
using a slightly larger GDT with no MOV's, "The world's only CAT IV IEC61010 rated true pocket sized multimeter"
Seems strange a little GDT can pull it off, no MOV's required? Zotek and ANENG jump on board.
You and I know the let-through/follow-through current would be a catastrophe in this crappy scheme.
Looking at the
PM300 approvals test report it appears fake- 61010 ESD tested to 4kV, but no mains transient testing. The
PM300 product manual states that wonderful term "designed to" which is not certified to...
You think a little GDT can achieve multimeter 61010 approvals?