[time-nuts] Thermal time constant
Mark Sims
holrum at hotmail.com
Fri Mar 12 04:40:28 UTC 2010
That's the 1502/1503 chart recorder that uses a hot stylus and paper roll with a punched timing track. Paper is available at $25-$36 a roll (min purchase 10 rolls). I have a mod that lets you use $1-$2 a roll ECG paper.
The 1502B/1503B/1502C/1503C are a different animal. Their chart recorders use a plain paper roll and a thermal bar printhead. And that horrid print roller and a paper feed mechanism that really sucks. Once you load a new roll in you have to print at least 4 charts to get it to feed properly. And if it doesn't you can spend the rest of eternity getting it properly adjusted.
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Jack Smith at Clifton Laboratories built a replacement for the 1502
chart recorders. An early prototype can be seen here:
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