Re: Any experience with CO Analyzer discussed in EC Issue

[Eddi Jew <jew@rysa.dtc.hp.com>]

 > I've been looking for a cheap exh gas analyzer for some time, and this is 
 > the first since the Heathkit that sounds interesting to me.  Are there 
 > competative units in the less than $500 range?

I've been looking, too. On CIS-E cars (like my '86 5KS and GTI), a rough
adjustment (tune up?) can be made by checking both the average current at 
the differential pressure regulator and the duty cycle of the idle
stabilizer. But I'm not certain if all is well unless I'm able to measure
CO (I may be compensating for an abnormal condition- vac. leaks, leaky cold
injector, etc.)

I'll be interested in products in kit form, also. If someone knows about
the transfer characteristics of a sensor, or the circuitry after that, I 
may offer my amatuer PCB prototying services for a limited run (if enough are
interested). Y'know, come to think of it, the rest of the stuff (duty-
cycle, RPM, current, timing) is not that complex (electronics-wise). Most 
of the trick stuff is transducers (CO, timing pick-up) and the signal
conditioning/buffering for those.

Nah. I was just dreamming of having my own super-meter that's pictured
in Bentley. But it's easier to just buy three separate meters and the
timing light. If the $200 CO unit really does a decent job, that can't be
beat.

Still, once in awhile, I just don't trust those digital displays. I'd 
rather have an analog (or digital-steps) meter and an adjustable 
"response" (or one of those small, OTC/Fluke 'scopes 8^) ) so that I can 
see the signal fluctuations myself.

-- Eddi "finding an excuse to tinker" Jew

 > TIA!
 > Steve Buchholz
 > s_buchho@kla.com
 > San Jose, CA (USA)