Originally Posted by Andrew
What are the units of Time on that plot of lambda sensor voltage? The data seem severely under-sampled.
You've written like someone familiar with digital signal processing. The manufacturer of the GS-911 doesn't state the time interval, just says it's faster than logging to a file. I'm estimating 200-300 mS. There is also no indication that the sampling is at a steady frequency--so no assurance of coherence. If you look earlier in the thread, I think I've plotted a sequential distribution of voltages reported. They are fairly linearly distributed with no sampling "holes". I'm going to round up an oscilloscope sometime this winter and get some additional info.
Bottom line is that the swings and crossings are good enough to satisfy the Motronic and they are very similar to how the stock sensor looks.
Here are what they say are usual plots: http://www.hexcode.co.za/techinfo/lambda