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Hi Rob
The controller box does not output a constant current; AFAIK, there is a 40% duty cycle which I take to mean that it is “switched on” 40% of the time and “switched off” 60% of the time. I am going on memory here for my Mk IV controller.
I once had a 4” dew strap that failed to work after a couple of years. Taking it apart revealed a broken wire inside, near to where the wire exits the Velcro backed heating strip.
When I turn the controller up to Max and connect a dew strip, I can feel the heat on my lips as it heats up – that’s how I test if they are working. My lips are more sensitive to heat than my fingers!
Cheers
Dennis
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