DIY-WB Output Voltage Scaling

[John Lamb]

Just thoughts:
So you are saying that plotting F/A (1/x function) gives two straight
line segments that intersect at Stoch?
I haven't plotted this--how close approximation (uncertainty) does each
segment give? There is always the inherent problem with line segment
curve fits to deal with,i.e.,how well you can match up the intersect
points--(how well the measurement is behaved on either side of the
intersect?) Depending on how much of a change in slope, you can have
quite a large change in reading either side of the intersect.

The rich side of the line segment, as you described, has the problem of
much less sensitivity/resolution. Obviously the sensor is biased to the
lean side of stoch by design for the application it was intended.

JL

> >For those interested in the nitty gritty details of this
> >display device, write me and I'll return the preliminary
> >(lengthy) writeup.  If you would like to get a better
> >feel for this, get out that WB output voltage vs A/F
> >curve.  Calculate the inverse of A/F (divide 1 by the
> >A/F), and plot these numbers (F/A) against the
> >voltage.  You will get a straight line, with a bend at S.
> >The sensor is LINEAR after all, if we could fix that
> >bend at stoich.  The display design fixes that too.
> >
> >Bruce Roe
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