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RE: Zerostat

"So using any form of de-static device including a Zerosat could help improve matters."

I agree. And you did a good job explaining the (IMHO) most likely mechanism.

I did, or at least started, an experiment years ago using a zerostat to place local charges on a CD which I was then going to play and see if I could see the charges by monitoring the focusing servo current while the disk was playing.

Well.. I never got around to doing the second step but I monitored the charge locations using a doghair electrometer for a few days and they were very stable, charges really persist in polycarbonate. However using the zerostat properly they were easy to remove.

A doghair electrometer (cat better?) is a hair taped to a toothpick and sticking out maybe 1.5". You just touch a spot on the disk (on the transparent side) to pick up a reference charge then you can see the relative charge on other areas by holding the tip close and watching it bend.

Regards Rick


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