Problem with testing WB (heater circuit)

[Peter Gargano]

Brian Renegar wrote:
> 
> The problem is, the sensor heats up and appears to be working, but the LED
> never comes on.

Sounds like the LED is in the wrong way around. If the LED doesn't come on
then the Vs/Ip circuit is disabled.

> within a minute of connecting the power, the current slowly goes down to
> about 1.23A.  Is this supposed to happen?

The regulator circuit current limits while the heater is warming up, and
then voltage limits to maintain the working temperature. If the Ih goes down,
then the LED should probably be coming on at that point.

>  I'm afraid to add any more
> resistors.  I don't want the current to go too high on initial turn-on.

Do NOT try and get the heater current above 1.5 Amps. 

Peter.

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