Chauvin Arnoux CA 6536 [P01140836] 10V /100V Insulation and Continuity Tester. Chauvin Arnoux model C.A 6536 has a variable test voltage from 10 V to 100 V, in 1 V increments. It is designed for special applications in sectors such as avionics, space and defence. Such applications often require a low test voltage and strict adherence to the programmed value.