I've had a reconfigure of the circuit, I found this article on the web. http://www.edn.com/electronics-news/438 ... t-Stations
I've attached the results below (2014318.0001), you can see the measurement across
the contacts approx 900mV and the contact resistance (I think) superimposed on the top and bottom of the waveform at around 80mV. The trouble is, if I try to take a measurement say between ground and the bottom level of contact resistance at 5V range it still gives 80mV, but if I up the range to say +/- 100mV the contact resistance is only 8mV.
The power supply is a tti QL355tp if that helps and I'm using a 6 Ohm load.
What do you think?