View Single Post
Old 04-06-2005, 03:43 AM
LeaUK LeaUK is offline
Registered User
Join Date: Feb 2003
Location: UK - South East Coast
Posts: 864
O2 sensor test and inverse duty cycle

I've read on Steve B site that when measuring the O2 output with a scope (I hope to do this Saturday) the duty cycle is the ratio of low voltage to high voltage. But this is contradictory to the duty cycle definition in the electronics industry. Where it's always high to low.

ie Steve shows a nice piccy of a scope (Fig 1) showing 30%, but clearly this should be 70% in my book. Is this due to the electronics inverting the output before presenting it to the X11 connector?

I'm pretty sure that O2 sensors themselves o/p a voltage 0.1-0.9V (approx) with the output increasing with detected O2?

Could someone help and clear my confusion..

'93 R129 500SL-32
'89 190E 2.6 - sold in 2002
Reply With Quote