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Message ID: 395     Entry time: Wed Feb 1 19:05:34 2012
Author: Zach 
Type: DailyProgress 
Category: Coating Q 
Subject: ESDs purchased 

I made some final changes to the ESD design and then purchased them. The only changes from yesterday were:

  • Add 4 holes for mounting:
    • 2 x 8-32 on the bottom, as we are planning on only holding from one end at the moment
    • 2 x 4-40 on the top, in case we decide we need to hold it there too. The reason for the size discrepancy is because I wanted to have at least two that were relatively beefy and I didn't have room for 4 in this board area range.
  • Indicate a 5-kV maximum voltage rating, based on the ~0.5-mm thickness of the board and the ~30 kV/mm dielectric strength of RO4350, with a factor-of-3 safety margin.
  • Make the board size as large as I could while staying in the same board area price range

After talking with Alastair about it, I also decided to order 4 boards instead of only two. The price goes down from $163/ea to $102/ea, and Alastair figured we might burn one out in testing and/or want to modify one later, etc. So, the total shipped cost was $410.

Here is the final layout:

ESD.png

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