Here is the problem. I'm running a series of charge/discharge tests on an old sulphated car battery and wish to record the results using my Pico AD40.
I have no problems with the discharge recording. Just place a load across the battery and put the AD40 (via 3:1 attenuator) across battery.
But the charging part may be a bit different as I am worried that the negative side of the charger may not be at the same (zero) potential as the earth of the computer.
I do not wish to damage the AD40.
So, can anyone recommend a simple way of isolating the AD40 to overcome this risk. Maybe some kind of opto coupler; whatever.
I've not had to deal with this problem before, so any advice is welcome.