Hi Berkeman,
Normally, a programmed EPROM will show a steady and constant bitcount (it should be of course).
I use my EPROM eraser with a 4W uv lamp. Normally an EPROM is erased in about 10 minutes. When I expose long enough, the EPROM erases completely.
Currently, I have erased about 40k bits...
Using an EPROM as a UV detector.
I was planning to make a UV meter using an EPROM. The idea was that ultraviolet light erases an EPROM. When a fully programmed EPROM (all zero's) is exposed to uv light I should clearly see the number of bits (one's) increasing.
So I have built a small...