Problem with testing WB (heater circuit)

[Brian Renegar]

Great!  The DVM was connected directly to the board for the Vout.  As I 
recall, the reference was spot on at 2.5V.  But I guess if the important 
resistors are +/- 1%, then 3.97V is within the tolerance for a 4.00V 
nominal reading.

Thanks for the help!!  Can't wait to start using it in the car.  :)

Brian


>Sounds good!  Yes the sensor may be still finishing
>warm up when the LED comes on.  Should be OK
>(we hope!).
>
>Your meter should be connected directly to the WB
>terminals; a connection to the car body will add more
>error.  If the 2.5V reference is off, the same error will
>appear in readings.  I would consider 3.96V plenty
>good enough for normal work; 0.1% resistors are
>expensive.
>
>Bruce Roe

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