92 PCB007 MAGAZINE I APRIL 2018
lyzer for a plating bath with addition of bright-
eners and levelers. The technology is simple
and easy to implement. Most maintenance or-
ganizations can accomplish the construction
and installation with process engineering su-
pervision. The payback is enormous, as this
can reduce defects, improve productivity, in-
crease reliability and lower costs. Give it a try
and write up your successes.
PCB007
References
1. Assembling the Public Lab LEGO Spectro-
meter.
2. "Chemical Feedback Process Control,"
Pittsburgh Analytical Conference, paper no.
24, March 1983.
3. "Printed Circuit Plating Bath Process
Control-Part II," Metal Finishing Magazine,
March 1985.
Happy Holden is a contributing
technical editor with I-Connect007.
To read past columns or to contact
Holden, click here.
Figure 15: A high-speed, R&D copper-fill plating bath and schematic of the plating controller using the six basic sensors.
