[time-nuts] thoughts on IR thermometers??

Neville Michie namichie at gmail.com
Wed May 28 01:31:20 EDT 2008

Just on the subject of body temperature,
the IR thermometers are quite good for skin temperature as the  
emmissivity of people is high,
BUT, skin temperature is about 31 C, and is not core temperature,
Hence the need to stick thermometers under tongue or elswhere where  
it is close to core.
There are IR themometers that look at ear drums, they give good core  
temperature readings.

I use a RAYTEK cheap IR thermometer, it works very well if you make  
allowance for emmissivity.
My HP10811 oscillator has such a low emmissivity that the thermometer  
cant detect any heat from the oven.
It does show up small variations in ceiling temperature and other  
small variations.

cheers, Neville Michie

On 27/05/2008, at 10:21 AM, Patrick wrote:

> Hey Everybody
> I tried to use a cheap IR thermometer to do some quick, pre-circuit
> analysis tests, a couple of years ago on a particular job.
> It went bad, the laser did not even line up with the area being
> measured, I missed a burning hot capacitor and wasted a lot of time.
> I was thinking about buying a better one this time. Does anyone  
> have any
> suggestions? Do you think they are useless for PCB tests? Caps should
> not be hot and power resistors and transistors should not be cold  
> right?
> but the spot size to laser ratio on most of these are not good, are  
> they
> still useful?
> I had a hell of a time trying to read my Son's temperature last night
> when he had a fever, anyone tried one of these out on their children?
> Thanks in advance-Patrick
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