AYes, especially the question pertaining to ‘–DC1’ and ‘–DC4’ models. For application purposes, the primary difference between these two ammeter families is the location of the shunt resistor: DCA-20PC ammeters have an internal low-loss shunt connected across TB1, while DCA5-20PC ammeters work in conjunction with user-supplied, external 50mV or 100mV shunts connected to TB1.