Author Topic: EEVblog #101 Thermal Chamber  (Read 3419 times)

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Offline TheWelly888

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EEVblog #101 Thermal Chamber
« on: July 25, 2010, 12:26:11 pm »
Your comment on the temperature reading not being in Faharenheit - well engineers and scientists have been using SI metric units for decades so Celsius is perfect!  ;D

A neat piece of gear that will come in handy for RF oscillator development as these are very sensitive to temperature change! 
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Offline DJPhil

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Re: EEVblog #101 Thermal Chamber
« Reply #1 on: July 25, 2010, 05:45:41 pm »
Point of note, the 'Herp Nursery' bit refers to Herpetology (I assume).

But yeah, I giggled a bit.
 

Offline Simon

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Re: EEVblog #101 Thermal Chamber
« Reply #2 on: July 25, 2010, 06:01:27 pm »
I've got a cheap and chearful cooler like that but not as big, I pcked it up for £2 at a car boot sale and use it for when we go on club outings, mine will take 15C off the ambient, but I've never tested it for heating up
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Online mikeselectricstuff

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Re: EEVblog #101 Thermal Chamber
« Reply #3 on: July 25, 2010, 10:49:32 pm »
Polycarb window ? Polystyrene more like. Can't see why they would use the more expensive material for a cheap product like this.
I wonder how much harder you could crank the Peltier to get faster warm/cool times..?

..and of course it doubles as a beer fridge, or somewhere to keep your solder paste...
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Online EEVblog

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Re: EEVblog #101 Thermal Chamber
« Reply #4 on: July 26, 2010, 12:49:42 am »
Polycarb window ? Polystyrene more like.

Maybe, poly something anyway. Fact is it does a pretty good job at the insulation which is all that matters.
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Offline NiHaoMike

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Re: EEVblog #101 Thermal Chamber
« Reply #5 on: July 26, 2010, 02:19:32 am »
That reminds me of the time when I put a wireless router (and other network hardware) into a styrofoam container in order to test its high temperature endurance. The heat from the device itself was not enough to get the temperature I wanted, so I pointed a hair dryer at the container, adjusting distances and angles to regulate temperature. I tested them at about 130F for 7 hours to simulate a hot attic. All of the devices passed since I did a lot of work to add heatsinking. (In the end, the devices never saw more than 85F in real world use as they ended up in a wiring closet...) The most interesting part was the popularity I got telling others how I rigged up a test lab in a dorm room...

And then there was the time, less than a year ago, when I had to build a good MOSFET amplifier for ECEN 325 class. It was a pretty cold day when I had to test it, so I decided to do a little socializing outside. In the process, the amplifier was cooling down to roughly 45F or so. I then held the unit using my jacket to avoid heating it up. I immediately did the performance tests once I got inside and the instructor said that he never saw a SNR as good as mine in the course - 52dB. (The requirement was just 30dB, and several of my classmates were having difficulty getting there!) When someone asked me how I got it that high, I told him that careful design (including a TI NEXFET for the final output) got me about 50dB of it, and chatting with some pretty females just before running the tests got me another 2dB... (Oh, I should mention that I was the only one to run the output stage at 2.5V instead of 5V to cut the output power dissipation in half and get some extra points. Easy A...)
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Offline saturation

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Re: EEVblog #101 Thermal Chamber
« Reply #6 on: September 01, 2010, 11:27:42 am »
A very good project, simple, direct and works.  After watching this show together with other non-Dave shows, its clear Dave is far superior as a presenter, videographer, editor, etc.,

In a pinch, I normally test for cold performance by putting smaller things in the fridge.  Currently, for hot weather, I simply put it outside to ambient which is running near 95F in the Northeast USA.

Putting the Rigol 1052E and the DMMs was a great show of their stability under ambient conditions.  Very convincing!
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