switching time of a O2 sensor

[David Garnier]

Mike, in my trying to trying to ask the group if O2 sensors are 
thermocouple junctions, I can across a couple web site that suggest
O2 switching times and this person has used a Tek storage scope
and has some screen dumps of good and sluggish sensors he tested.
http://www.cnnw.net/~fourty/uses.html 
http://www.cnnw.net/~fourty/uses1.html
I wish I had a digital scope instead of my 465, the sensor time
is easily visible:  http://www.cnnw.net/~fourty/advanced2.htm
It looks like .1 second switching times, with a "good O2" sensor 
waveshape taking on sinusoidal appearance;  Maybe others will
characterize the sensor better...

Someone has brief description of his thesis paper on developing
O2 sensors which is interesting; it's a chemical thing. ;-)
http://www.geocities.com/CapeCanaveral/2082/myjob.htm#index

Here is a design paper where pspice was used to model the O2
sensor, modeled from National Semiconductor's LM9040 datasheet:
http://falcon.cs.mercer.edu/~johnsont/srdesign/pdr/appb.htm

I found this site where his person has built a O2 sensor simulator
from a 555 timer: http://www.bobblick.com/bob/auto/o2sim.html
This maybe useful for benchtesting ecm's.

dave garnier