Re: Chart for OXS voltage=A/F ratio?

[russ southerlin <russ.s.southerlin@ast.lmco.com>]

> I'd like to hook my multi-meter to the OXS output for a while to use as
> a poor man's mixture meter (ala the cyberdyne and K&N meters) to see how
> the setting's change over the RPM band.

I've done exactly this just for a "feel good" to know that the mixture
is  gettting enriched properly at full boost (14.5psi in my case). I
used a digital voltmeter and found that at idle the voltage varied from
about 0.4 to 0.7 Vdc. I think this is what the system is supposed to do
since the duty cycle of the frequency valve is constantly changing the
mixture at about 60Hz with a feedback from the O2 sensor. At crusing
speeds the voltage stayed in the 0.4 to 0.7 range. When decelerating the
voltage went to 0.0. With wide open throttle you could see the voltage
jump up to the 0.8 to 0.9 voltage range as soon as the wide open
throttle switch was activated.

You really need an oscilliscope to get a complete picture of what is
going on as the digital meter bounces around quite a bit. I think I am
going to do the oscilliscope thing as my next "science project" - may
have to find a really long extension cord!!!!