DIN EN 60051-2:2017-02

Part 2 of the standard applies to direct acting indicating ammeters and voltmeters having an analogue display. It also applies to: direct acting indicating ammeters and voltmeters whose scale marks do not correspond directly to its electrical input quantity, provided that the relationship between them is known; direct acting indicating ammeters and voltmeters and accessories having electronic devices in their measuring and/or auxiliary circuits. These standards do not apply to: special purpose instruments which are covered by their own IEC standards; special purpose devices which are covered by their own IEC standards when they are used as accessories.