Hi guys,
My two Stouffer 21-step step gauges arrived the other day, and I'd like to
use them to figure out an exposure for a positive-acting precoated photoresist
board. I've had a look at the instructions on Thinktink's website, which are
about as clear as mud and seem to be for their own (negative acting) photoresist.
Can anyone explain how to do this? The laminate I was going to try and
calibrate is some really old Maplin "Economy Single-Sided SRBP Photo-Etch
Board" that one of my friends wants testing. Frankly it saves me digging into
my own stocks of (FR4) board...
Also, does anyone know how the procedure for setting UV exposure levels
differs when using positive photoresist?
Thanks,
--
Phil.
ygroups@...http://www.philpem.me.uk/