[time-nuts] Thermal time constant

[Mark Sims]

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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