Potting in thermally insulating foam

Just make sure you get the right one. The cheapest version sets HARD and exerts enough force to bend window frames. The slightly more expensive version is much softer.

Or find someone who doesn't constantly cut corners. :(

--
Politicians should only get paid if the budget is balanced, and there is 
enough left over to pay them.

Around open wounds? I've put up with it for over five years already, and even the cotton ball & vinegar can rip it open around the edges.

--
Politicians should only get paid if the budget is balanced, and there is 
enough left over to pay them.

It's a national pastime in some countries.

Best regards, Spehro Pefhany

--
"it's the network..."                          "The Journey is the reward" 
speff@interlog.com             Info for manufacturers: http://www.trexon.com 
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

around the

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Double oven!

--

John Larkin                  Highland Technology Inc 
www.highlandtechnology.com   jlarkin at highlandtechnology dot com    

Precision electronic instrumentation 
Picosecond-resolution Digital Delay and Pulse generators 
Custom timing and laser controllers 
Photonics and fiberoptic TTL data links 
VME  analog, thermocouple, LVDT, synchro, tachometer 
Multichannel arbitrary waveform generators

So is target shooting. ;-)

--
Politicians should only get paid if the budget is balanced, and there is 
enough left over to pay them.

Were you hot & sweating, or was it a cold day? Makes a big difference.

--
Politicians should only get paid if the budget is balanced, and there is 
enough left over to pay them.

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Double fudge brownies!

Hmm. Ideally, if the ovens and their contents were isothermal there wouldn't be any convection. But life being what it is, a chunk of copper in the inner box might be necessary to ensure that.

Adequately insulated, the outer box forces the inner box to the same temp.

Interesting choices. I guess fastest-settling is an inner oven at something less (cooler) than the LTZ die, and an outer oven cooler than the inner, all actively controlled.

I'm not sure what matters most to John though--stability of temp, or isothermal environment.

--
Cheers, 
James

[...]

I only want to run the die at 10-15K above the max ambient (about

30'C). Otherwise long term stability is degraded. So there might not be scope for too many levels here.

Isothermal environment (pads) I think, at the moment. The die has its own integrated heater and sensor and there is an external control circuit to accurately stabilise the die temperature. The function of the insulation is more to stop air currents, which could result in fluctuating pad/lead temperatures. And cause large errors due to 35uV/K kovar-copper thermocouples. The insulation also reduces the power requirements and should prevent external thermal gradients appearing across the critical pads the way I am doing it.

--

John Devereux

Thanks. That will be useful for handling a variety of materials.

?-)

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Perhaps you can use rock wool in close, wrap in a plastic film, foam the outside, and cut back to target dimensions. Better potential reparability.

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Depends, that might be NaCo3 treated paper shreds.

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Nah, it's definitely fibre glass or "rock wool" I suppose, I put it in!

And yes got rash all over my arms the first time.

--

John Devereux

Dawn was the one I used most of the time. The cheap watery stuff didn't work as well.

--
Politicians should only get paid if the budget is balanced, and there is 
enough left over to pay them.

Sure it makes a difference but I was sweating at times. When I was in NY, I did it in the middle of the Winter and still itched for days. I think they've changed the fiber, perhaps it doesn't break as easily, or perhaps breaks in larger pieces. There is some marketing blurb on the packaging about it but doesn't explain it at all.

newer formulations have bio-soluble fibres, the itch goes in a few hours.

--
?? 100% natural 

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I haven't bought any in 14 years, and still have a full roll left so I'm not familiar with any changes. This wasn't OCF.

--
Politicians should only get paid if the budget is balanced, and there is 
enough left over to pay them.