Chauvin Arnoux CA 6524 [P01140824]  50V / 100V / 250V/ 500V /1000 V Insulation and Continuity Tester. Chauvin Arnoux models C.A 6522, C.A 6524 and C.A 6526 are simple-to-use insulation and continuity testers designed for industrial maintenance operations. They are particularly popular for use in planned periodic insulation tests on installations and equipment. This helps prevent incidents by detecting ageing and the premature deterioration of insulation characteristics.