Source:http://linkedlifedata.com/resource/umls/id/C0183893
UMD: Testers designed to assess the main characteristics of an isolated power system. These testers typically consist of an electronic measuring unit including a display, a current generator, controls to select the test, and appropriate leads. Most isolated power system testers can test line voltage, line isolation current, and line isolation monitor and ground-fault circuit interrupter operation and trip current; they are used after installation, in preventive maintenance procedures, and after power system modification or repair.