WBO2 questions

[bcroe at juno.com]

If you put a voltmeter across the WB heater terminals, 
you may find there is very little change after 1 minute.  
That means you are right on the edge, but on the wrong 
side to turn on the LED.  That last bit of creeping up 
in 3 minutes is not needed for safety.

It should be safe to have 45 to 60 second warmup.  I 
would add resistors paralleling R4 to achieve that.  I think 
some 15 ohm 1/4 watt resistors were supplied; I needed
to use 3.

To test full ange on the bench, you will need some gases.

Bruce Roe

On Wed, 27 Mar 2002 11:42:46 -0500 david.roland at gm.com writes:
> I just finished the final checks on my WBO2 sensor. 
> Everything seems to be working OK. I have a couple of 
> questions regarding testing and warm up. I am testing 
> my circuit, on the bench with a fully charged battery and 
> a charger attached to the battery.
> 
> It takes about 3 minutes for the heater circuit to warm 
> up, and about 20 seconds more for the LED to light. I 
> know that the warm up time can be altered by placing 
> more resistors across R4. QUESTION: What is the 
> optimal warm up time?  Does the 3 minute warm up 
> time sound about right? What value resistors do I use
> across R4 to decrease warmup time?
> 
> I don't want to heat the sensor too fast and risk damage. 
> QUESTION: 
> What can I use on the bench to test the sensor output 
> over the entire AFR range?
> 
> Dave

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