Re: Contact Thermometer for Component Temperature

On Thu, 14 Feb 2008 01:41:38 GMT, Ecnerwal
<LawrenceSMITH@xxxxxxxxxxxxxxxxxxxx> wrote:

In article <bl27r3hcs9g7c2doe470um4imobt16toun@xxxxxxx>,
D from BC <myrealaddress@xxxxxxxxx> wrote:

I've been looking around and haven't found it yet..

Where can I find a small temperature sensor on a long probe (like a
scope probe) to measure the temperature on 8pin SOIC chips and 1206
resistors?
The probe plugs in a DMM or similar readout.

Look for thermocouple probe. Some multimeters take one directly (mine
will work with Type K only).

ie, newport 48F5805 is a 48 inch type K with multimeter type plug
installed, for $13. Also says no longer available, but 7 in stock...
Stick it in a tube and it's a probe. Hot glue is your friend.

A rigid probe prebuilt would be (for example) 93F9285, at $30.

Sometimes you can find them in surplus.

You could also stick any of the TO92 devices (LM34, etc) on the end of a
stick/tube. Angle the mount on the stick so you can get the flat on the
flat of the case to be measured.

If you like you can simply buy the wire and weld it yourself to make
thermocouples. You can even get retro and use a bucket of ice and a
chart, instead of a meter to figure it all out for you and fake the
bucket of ice.

I tried that with a SOT-23 TMP36 sensor.
http://www.analog.com/UploadedFiles/Data_Sheets/TMP35_36_37.pdf
But I damaged the sensor (1) and cancelled the project.
It was taking too much time.
I'm not a thermometer company :P

(1)Suspect a number of causes. One is:
Thermal shock.
The sensor went in microwaved water for calibration and testing.
Turns out, this is a method to get superheating.
http://en.wikipedia.org/wiki/Superheating
The water could have been between 101C to 374C ??


D from BC
British Columbia
Canada.
.

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