great info thankyou I will do some more fiddling with my meter, just what I needed.
just been testing fets using a very very simple set up as per below pic, works a treat.
Can just touch gate then positive battery with fingers to turn on fet, touch negative battery to turn it off.
Could expand on this simple technique eg. use a string of leds to show if switching fully on ( pretty easy to judge by lightglobe brightness though). Could also make up a simple test unit based on this to verify which phase of fets has blown in a controller.
thanks to warwick smith of numurkah secondary school who showed me this simple test method about 10years ago.
another use for this very simple circuit could be a touch switch on/off for low voltage house lighting.
I will add some more pics of this simple test circuit as I have it setup on kitchen table, but will make a new thread for it
as I think its very easy for anyone to build this circuit within about 10mins.
Just need car taillight or blinker globe, sla battery and two alligator clips.........simple as
it also demonstrates how sensitive these devices are, in that the tiny current that flows via your hand ( or body) is enough to turn them on/off.