1. The original version of this was shown by Dr Jennings in Chicago at an IPC
meeting, as I recall it was 1978. The paper was published in the IPC Tech
Review, I still have an original hard copy in my EmR (Electromigration
Resistance) file.
2. The original was 16 mm, I had an original 16 mm from Dr Jennings, but I'm
not sure if it survived the move from DE to CO. It was later transferred to
VHS then to a computer file format.
3. In an earlier life we built a simple unit to measure the time to reach 500
microamp current leakage based on this. The digital timer started
automatically when the current leakage hit 4 microamps current leakage, turned off when
500 microamps was reached. We used it to measure current leakage on comb
patterns from the IPC B-25 test boards. Surprisingly, only got dendrites in about
half the cases when got the 500 microamps current leakage. As I recall, it only
cost about USD 200 to build the equipment. We did publish data gathered with
this unit, plus SIR and ionics, on several flux/soldering/cleaning processes
for PWAs, as well as on several different IR fusing fluid/cleaning agent
combinations. [The difference in WSFF/water cleaning & SAFF/solvent or emulsion
cleaning were striking, with a several orders of magnitude increase in SIR with the
latter processes.
4. The device was offered to the IPC Cleaning & Coating
Committee/Electromigration TG, but I don't know if anyone took advantage of it. The schematics are
still in my EmR files.
5. I believe that Dr Jennings is no longer with us, which is unfortunate.

Bill Kenyon
Global Centre Consulting
3336 Birmingham Drive
Fort Collins, CO   80526
Tel: 970.207.9586   New Cell: 970.980.6373

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