At 06:57 AM 11/7/2009, you wrote:
><capav8r@gmail.com>
>
>Bob:
>
>I have assumes that the windings are Y-wound and not delta. The
>connector for the unit only has three pins and they are labeled a, b, and c.
>
>I am assuming by your comment that we are using two phases that we
>have picked up the signal improperly from the tach gen
>itself. However, when we tried to get a signal from one pin with
>the case as ground reference, we had no signal at all.
Understand . . . and it's what I would have expected.
So there's no "improper" connection, only a "less
than ideal" connection.
The design goal is to craft a squaring circuit that
has the narrowest window of uncertainty that is
centered in the area of the waveform least likely
to be problematic.
What are the specs for signal input to your engine
monitor? Does the square wave need to be of any
particular "sqareness" i.e. rate of change or
simply "clean" and free of extraneous changes
in direction.
If I were designing such an instrument, I'd
be interested only in a clean representation
of period be it a sine wave, pulse, trapezoid,
etc . . . all I'm doing is counting transitions
from highest to lowest voltage. I'd do all of
my "squaring" internally to accommodate the
needs of the electronics. So I'm betting that
if you get a clean 5v signal of any shape . . .
the electronics will be happy.
Bob . . .
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