Gives in detail classification, permissible intrinsic errors and their permissible variations for recording the instantaneous, and the effective and mean values of one or more measured quantities as a function of time. It refers to strip, drum and disc recording instruments, including ammeters, voltmeters, wattmeters, varmeters, phasemeters, power factor meters, frequency meters, and ohmmeters. It also applies to certain accessories such as shunts, series resistors, inductors and capacitors.