Source google image: https://www.researchgate.net/profile/Charles_Frazier/publication/277543995/figure/fig3/AS:458791985651714@1486395941192/Envelope-test-for-current-isolation-Voltage-steps-lasting-10-50-100-250-500-or-1000.png
Isolation 60+10
Source google image: https://www.researchgate.net/profile/Charles_Frazier/publication/277543995/figure/fig3/AS:458791985651714@1486395941192/Envelope-test-for-current-isolation-Voltage-steps-lasting-10-50-100-250-500-or-1000.png