Harvey ; try : http://www.bidservice.com ; if you're on budget ;
yes the 1 hour is usual (IPC-SM-785) ; unless you build to the -65+125
(MIL), that's extreme .
Standard you can get from IPC : http://www.ipc.org ;
and the fellow who wrote it is very helpful ; get the standard
(whichever you have to work to) BEFORE you'll go shopping .
Yes , if you'll get close to 10'C/min you'll be better off ; but out of
pocket , you'll have to estimate how fast will you be required to get
the results and calculate them into your program ; some drag for half a
year ; or more still .
Fast chambers are more or less made to specs ; you're right there .
You'll need a failure monitor as well : email : [log in to unmask] :
John Sofia or Craig Desrosiers ;
and a PC .
Makers by dozens on web, search .

See you
Paul Klasek
http://www.resmed.com
> ----------
> From:         Harvey M Phillips, Dr[SMTP:[log in to unmask]]
> Sent:         Monday, 20 July 1998 12:18
> To:   [log in to unmask]
> Subject:      [TN] Thermal Cycling Chambers
>
> Dear TechNetters,
>
> I am very new to the PCB industry, so please allow me to ask a stupid
> question.
>
> When talking to people about thermal cycling, I keep hearing that one
> thermal cycle is completed in about one hour.  For instance, a recent
> TechNet posting spoke of a thermal cycling test from  -65 C to 125 C
> with a 30 minute dwell and a 38 minute transfer.  I assume that the
> term
> "38 minute transfer" means that you go from one extreme temperature to
> the other in 38 minutes.   This would mean a heating/cooling rate of 5
> degrees/min., if I am calculating correctly.   A complete cycle would
> then be completed in 2 hrs. 16 min.
>
> My difficulty is that all the chambers I have seen from vendors only
> have a heating/cooling rate of about 3 degrees/min.   We are a new
> research institute and plan to buy some thermal cycling chambers soon,
> but I don't want to buy something that won't meet our needs.
>
> Does everyone now have special chambers made?  Can anyone recommend
> some
> manufacturer who can meet the specs of heating/cooling rates > 5 deg.
> C/min.?
>
> Any input you can give me would be greatly appreciated. Thanks in
> advance.
>
> Best regards,
> Harvey Phillips
>
> Harvey M. Phillips
> Research Fellow
> Institute of Materials Research and Engineering
> Block S-7, Level 3
> National University of Singapore
> Singapore 119260
>
> TEL: (+65) 874-4314
> FAX: (+65) 872-0785
>
> email: [log in to unmask]
>
> temporarily attached to:
> Gintic Institute of Manufacturing Technology
> 71 Nanyang Drive
> Singapore 638075
>
> TEL:  (+65) 793-8539
> FAX:  (+65) 792-2779
>
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