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Digital Thermometer

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Question for everyone out there:

I'm about to go out tomorrow morning and start searching for a digital thermometer. I'll be looking for one with a sensor on a lead or wire attached to the device, something i could permently or semi-permently affix to the cpu of my motherboard (athlon xp 1800).
If anyone out there could provide me with a manafacture name or even more possibly a product # of which they'd suggest for this purpose i'd greatly appericate it. :)

"And he said, "Let There Be Light"" -God

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OK, you should know the the sensor on the lead cannot be attached to the cpu. They are supposed to be seated between the heatsink and cpu for accurate readings. Problem is the pressure from the heatsink crushes the sensor.
The goal is to get the core temp, since you cant put the sensor anywhere near the core, there is no point in getting a thermometer with a lead.
If you want accurate readings, your best bet right now is to get a mobo with a thermal diode reader built into it. The newest boards support the diode that is on Athlon XP chips. I think there are 2 or 3 mobos that do this. So be sure and check/ask.

Benchmarks are like sex, everybody loves doing it, everybody thinks they are good at it.

Reply to texas_techie

ah, i see good point, but then if not to use for my current system then i'd at least like to know what my older systems run at, which could be set on the side of or near the actual cpu. Most older systems i mess with are amd k6-II or the first pentiums (90mhz - 200mhz) or in most my puters 120mhz - 250mhz.

"And he said, "Let There Be Light"" -God

Reply to Kithylin

Hmmmm, interesting problem. Id say go with a laser thermometer. Point the laser at the chip, and get a reading. Still wont get core reading, but its better than nothing.
Im not sure if the bios of systems that old display temperatures. But my understanding is most programs that read bios temps are not that accurate either.
Anyone else here know of an accurate way to read temps other than leads or bios?

(please dont say mobo moniter, its off by several degrees from what I have seen)

Benchmarks are like sex, everybody loves doing it, everybody thinks they are good at it.

Reply to texas_techie
- 0 +

#1) What's your budget?
#2) Does it need to be permanent?
________

Suggestion:
I'd use a multimeter with a temperature probe/thermocouple.

Materials:
- <A HREF="http://www.fluke.com/products/home.asp?PID=3635" target="_new">Fluke 16 multimeter with temperature probe/thermocouple</A>
- Thermal epoxy (NOT paste)
- Drill
- Drill bit slightly larger then thermocouple
- Needle/syringe
* You should be able to find everything above at Radio Shack

Installation:
- Remove heatsink from computer
- Measure the diameter of the thermocouple and drill a small hole into the side of your heatsink deep enough so that the end of the hole is directly over the core, as close to the surface (that contacts the core) as possible.
- In this (bad) drawing the drill hole is marked in blue:

......[FAN].......
|||||||||||||||
|||||||||||||||
|**********|
|<font color=blue>======</font color=blue>****|
--------------
___[CORE]____

- Make sure the hole is clear from debris and the thermocouple fits down the hole.
- Tilt the heatsink up on it's edge so you're looking right down the hole. Get out your thermal epoxy (follow directions) but if it's a two part try not to make bubbles when you mix it. If you do get bubbles try lightly banging the mixing container on the table to work them to the surface.
- Using the needle/syringe suck up enough epoxy to fill the hole. Stick the needle all the way down the hole and fill it 'til it is full. Slowly withdraw the needle while continuing to overfill the hole, to ensure no air bubbles are trapped inside.
- Dip the thermocouple in epoxy, making sure the length going in the hole is covered in epoxy, and then slowly insert it into the hole. Make sure any excess epoxy doesn't drip and run down the bottom side of the heatsink.
- Let the epxoy cure and then re-install your heatsink.
- Lead the thermocouple wire out of the case. Whenever you wish to check the temperature just plug the multimeter into the thermocouple. You can buy more thermocouples if you want to measure the temp of anything else.

You'll have a good multimeter as well.

- JW
<P ID="edit"><FONT SIZE=-1><EM>Edited by JCLW on 03/11/02 08:21 AM.</EM></FONT></P>

Reply to JCLW

Very intresting idea, i'd never thought of this, and my budget isnt very high, as i'm not rich, i had to save for months to get my xp 1800 chip, still stuck on a geforce2 TI200, cant afford those expensive ti4400 gf4's yet Whew expensive!

I was looking towards about maybe $30 for the whole thing, if not maybe a little less.

Again very good idea you had there JCLW. :)

"And he said, "Let There Be Light"" -God

Reply to Kithylin

u could try to stick on to the underside of the core... but i dont know exactly how u would get the lead in.

I love helping people in Toms Forums... It reinforces my intellectual superiority! :smile:

Reply to lhgpoobaa

JCLW: Again your idea worked perfectly, i found a good model at Radio Shack for $19.99 that measures up to 158F and has a cylindrical sensor lead, it even talks when you press the button. It's Very ideal for inserting into a drilled hole in allunimum (no i cant spell that word), which i did try, to much success.

The only problem i see with this model is it's slow to update with rapid temp. changes, other than that it seems to be quite accurate. For anyone intrested the Radio Shack Part # is 63-1028.

I tried this idea in this old P166-MMX, it worked well, helped me find which fan works best with this heatsink, which i plan to keep using. I got it to run at 115F even overclocked to 250Mhz.

"And he said, "Let There Be Light"" -God

Reply to Kithylin
- 0 +

You could build something using this.

<A HREF="http://pdfserv.maxim-ic.com/arpdf/AppNotes/1wirethermo.pdf" target="_new"> 1wirethermo.pdf</A>

$4 for the k type thermocouple, $7 for the chip, $5 for a bottle of asprin

That would make you cool.


All errors are undocumented features waiting to be discovered.

Reply to Schmide
- 0 +

Glad you found something that worked - I hadn't thought of using one of those. The probe looks rather big - how far in the heatsink can you get it? Are you using thermal epoxy or paste in the hole?

If you could find out what kind of thermocouple it used you could buy a few more of them and stick one in every heatsink. Slap some cheap plugs on the end of their leads and move your thermometer around between your systems.

Aluminum - Which is how it is really pronounced - AL-YOU-min-EE-UM

- JW

Reply to JCLW
- 0 +

Quote :

Aluminum - Which is how it is really pronounced - AL-YOU-min-EE-UM


In the US its pronounced - A*lu"mi*num


All errors are undocumented features waiting to be discovered.

Reply to Schmide

i didnt get to use an epoxy just yet, as i just wanted a temporary trial to see how well it worked, i was able to use my good old black&decker power drill from like the `70s to bore a hole completely through the heatsink.

I then examined the probe closely, it turns out the white plastic around the probe is removeable if you try hard enough. I was able to get the proble down completely aginst the cpu, then used a few drops of hot glue to hold it in place. Let all dry about 10 mins, then assembled it.

As it turns out, the exaust fans used in PC power supplies, as well as the fans used to cool our heatsinks are raised slightly, which provided just enough clearence between the fan blades and the back of the wire of the probe.

I squezed the fins of the heatsink together to hold the wire of the probe back and out of the way and i got a decent semi-perment fixture.

if anyone wants i can send pictures of the finished assembly as well as the probe and thermometer.

"And he said, "Let There Be Light"" -God

Reply to Kithylin
- 0 +

oops... I spelt it incorectly in my last post.
/me feels rather silly

"Aluminium"

I've heard many people pronounce it "aluminum". Looking it up in the dictionaries I found references to both "aluminium" and "aluminum". My father (who has a masters in metallurgy) says most of the scientific community says "aluminium" while most of the public says "aluminum" (because it's easier to say).

- JW

Reply to JCLW
- 0 +

It is a neat derivation of language.

The root word of <A HREF="http://www.dictionary.com/search?q=aluminum" target="_new">aluminum</A> or <A HREF="http://www.dictionary.com/search?q=aluminium" target="_new">aluminium</A> is <A HREF="http://www.dictionary.com/search?q=alum" target="_new">alum</A> which is specifically pronounced in the British way. However, <A HREF="http://www.dictionary.com/search?q=alumina" target="_new"> alumina</A> the oxide form is pronounced in the new Latin form. Its kind of funny because I used to think there was a separate element <A HREF="http://www.dictionary.com/search?q=aluminium" target="_new">aluminium</A>. I’m definitely no not a language expert but I do enjoy the use of<A HREF="http:// www.dictionary.com" target="_new"> www.dictionary.com</A>.


All errors are undocumented features waiting to be discovered.

Reply to Schmide
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