Chauvin Arnoux CA 6534 [P01140834] 10V / 25V / 100V / 250V / 500V Insulation and Continuity Testers. Chauvin Arnoux model C.A 6534 has a wide test-voltage range, from 10 V to 500 V. This covers the specific requirements of the electronics industries, whether they involve low currents or power stages. The C.A 6534 measurement range is from 2 kΩ to 50 GΩ. With appropriate electrodes, the 10 V and 100 V test voltages can also be used for electrostatic discharge applications.