O2 voltz

[Wen Yen Chan]

On Sat, 15 May 1999, Bruce Plecan wrote:

> For the lack of anything else to do, I hooked the heated O2 up, and was
> looking at the voltage drop across a sensor resistor, I been thinking of
> using.
>   As the heater warmed up, the voltage drop across the resistor changed,
> just meaning the heater was drawing less current.
>   I had hooked the scope probe across the O2, and cold there was no output,
> to be expected, but as it warmed up the output swung toward, .2v.  Just in
> atmospheric conditions.  Ok, so then it should go way high in pure O2 right,
> nope went a little over .3, and stopped there.

I think you have got it backwards. The sensor should be reading a very low
voltage as there is no difference in the concentration of O2 on both sides
of the sensor.

Wen

>   Did I need to load the sensor?.
>   The heater doesn't go to a high enough temperature for the O2 to fully
> swing high?.
>   Does the engine side need to see a slight amount of pressure to reference
> to?.
> Grumpy
> 
>