Two questions here:
1. Could it be used in 500Vrms AC isolation?
2. could we use meters with 20Mohm to measure the resistance between input and
1. ADM2587E's continous working voltage is 400Vrms. If you wonder higher
isolation rating, please consider ADM2687E (Viorm=600Vrms).
2. the typical resistance between input and output is 1T, I'm afraid that is
above the maximum range of your meter.