Author Topic: Haven Thermocouple Calibrator  (Read 1083 times)

Mr Eastwood

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Haven Thermocouple Calibrator
« on: March 11, 2017, 11:52:38 AM »
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! 





« Last Edit: March 15, 2017, 06:55:09 AM by Mr Eastwood »
Hey! Frisbee! Far out!

Mr Eastwood

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Re: Haven Thermocouple Calibrator
« Reply #1 on: March 22, 2017, 09:28:41 AM »
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.
Hey! Frisbee! Far out!