Use 2 ADG726 ICs to switch on-off to test 4-wire resister . if '/EN' pin set '0' A0-A3 set to '0', it works well , And we can measure resistor with 4-wire , but if '/EN' pin set '1' A0-A3 set to '0' , we still can measure resistor with 4-wire , but change to 2-wire test , it cannot measure resistor . it is very interesting , from the data sheet , we cannot find any useful info to solved it . please help!!!
Thanks for ADI hard working guys.
Just to be sure I am understanding correctly, are you saying when you bring /EN high that one of the channels remain on? When /EN is high the switches should be open.
Its been a while since we have heard from you so I assume you have solved this problem. If not feel free to contact us at any time.