SR501 SR501 is a high level 600 ohm : 600 ohm isolation transformer. in+ 1 in- 5 out+ 7 out- 9 Faraday shields 6+10 admin2017-12-06T12:58:58+01:00June 17th, 2015|Pinout description| Share This Story, Choose Your Platform! FacebookTwitterLinkedInEmail