electronic testing measuring instrument; Automatic component analysis instrument; precision lcr digital electric bridge; high speed lcr digital electric bridge; lcr digital electric bridge; Capacitance tester; electrolytic electric capacity leakage current testing instrument; Inductance tester; direct current electric current source; digital universal meter; digital universal meter; autotransformer testing system; pulse coil tester; winding insulation testing instrument; winding testing instrument; Direct current