On 5/8/2017 8:19 PM, mike wrote:

If I pass my 12:1 IR temperature probe across the resistor, the highest
reading I
can get is 71F if I stick it as close as possible to the resistor.
You really need the area being sensed to fill the whole field
of view of the sensor. Pretty much useless for today's electronics.

You can restrict the field of view with a straw. I haven't calibrated
this approach, but it should work ok. The sensor element is very small
and is at the base of a black cone which I believe is what establishes
the field of view. As long as you are viewing hot items it shouldn't
matter that the straw is not as black as the cone. Maybe I'll try this
later if I can find my IR thermometer.

--

Rick C