MJLorton Solar Power and Electronic Measurement Equipment Forum
Older Technology => Older Technology => Topic started by: Mr Eastwood on March 11, 2017, 11:52:38 AM
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I bought one of these a few years back on Ebay and I was going to tear it down but didn't get around it; I have since got hold of a Microcal Plus so, I thought I would tear the Haven and have a look inside.
Some things I noticed were; 80C39HC uC, 8K eprom chip , 12 adc chip (icl 7109) which uses an external tc04bc634ak 1.25v bandgap ref @50ppm, a few M82C53's doing I/O and interestingly a MM57409N number cruncher chip!
(http://1.bp.blogspot.com/-ky2tl-wHdpI/T5LaDaRZLII/AAAAAAAAA9Y/IJxh3EaRo6k/s1600/2011-02-18+12.36.54_small.jpg)
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Just to add, the t/c input posts were screwed to a fairly thick aluminium plate with a small hole in, which inside was inset with a AD590KH, this is to measure the cold junction temperature.