I'm wondering if you know that Mercedes bases duty cycle on the amount of time at zero volts rather than the other way around, as is more conventional. In other words, you're measuring the amount of time at zero, as a percentage of the total cycle, just the opposite of what you might expect. That's why the duty cycle formula requires subtracting the readings from 1 to arrive at duty cycle values. Sorry if this is obvious to you.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't