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[Thomas K Hemmick <tkhemmick AT gmail.com>]

My connect is this:

• The most important ground connections in terms of noise are:

• Preamplifier --> Padplane --> HV card (including bypass cap on bottom of GEM4)
• These connections need to be low inductance.
• This is partly achieved by having many such connections in parallel (more than 30 per connector; more than 60 per FEE).
• This is partly achieved by having these connections with minimal line length.
• Let's call these "signal ground".

All metal items are required to be grounded for safety.

• These connections should be able to support reasonable currents.
• They do not, however, have the aspects of multiple in parallel.
• They do not have length restrictions.
• Let's call this safety ground.

The common application is that "signal ground" and "safety ground" connect to each other at a remote "earth ground" location.Tom

On Tue, Sep 1, 2020 at 10:46 AM Takao Sakaguchi <takao AT bnl.gov> wrote:

Dear All,

   It was suggested at internal review of AC/DC system (LV,
HV, etc) held in June that it would be useful that we make
an outline of the GND scheme of subsystems. I have been
slow on this, but now I came up with a rough sketch on this.

https://www.dropbox.com/s/ad0oy29b06emlcw/Grounding_Scheme_Sep1_2020.pptx

  In the end, we should make an integrated, much sophisticated
drawing. I appreciate any comments/feedback.

Thanks,
Takao
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