For many months my TC Elec. Nova Delay has played nicely with the Carl Martin Power Pro 2 supply unit (it has an option to have one output at the requisite 12v 300mA) but lately after about a half hour of playing, sometimes less, the delay just seems to lose power and turn off. When I use the TC. Elec power supply adapter there's no problem, which makes me think the issue lies with the output of the Power Pro supply.. It's less than a year old, so if there's a problem I want to get it dealt with under warranty. How do I go about measuring the amperage output? I measured the DC voltage, and it's at 12v, but I can't seem to figure out how to measure the current (and yes, I've googled it - they all seem to be about measuring current draw of circuits). Any thoughts?