[SI-LIST] Re: PCB materials, solders, and components for VERY HIGH impedance applications

From: "Kevin G. Rhoads" <kgrhoads@xxxxxxxxxxxx>
To: Steven Waldstein <swldstn@xxxxxxxxx>
Date: Mon, 23 Aug 2010 15:05:13 +0000

Bob Pease wrote about this in some of his columns.
Jim Williams discusses this in one of the LT app notes.
Keithley's white papers, app notes &c discuss these issues.

Start with Keithley's low level measurements, then proceed
as you see fit.  But start with Keithley -- they've been doing
electrometers since vacuum tube days.

Specifics:
1) on board
        a) clean
        b) use guard electrodes and driven shields on cabling
2) if possible "air wire" sensitive connections
3) teflon, PTFE
4) clean (brought up again, clean repeatedly, by several methods)

5) surface prep and cleaning for VACUUM use will also be useful at reducing 
leakage -- so at
http://www.tubebooks.org/technical_books_online.htm

in particular !!! these are direct download links, 
clicking on them WILL START A DOWNLOAD:

http://www.tubebooks.org/Books/Atwood/Kohl%201960%20Materials%20and%20Techniques%20for%20Electron%20Tubes.pdf
http://www.tubebooks.org/Books/kohl_materials.pdf
http://www.tubebooks.org/Books/Kohl_1951.djvu
and
http://www.tubebooks.org/Books/intro_RCA_1962_Electron_Tube_Design.pdf
http://www.tubebooks.org/Books/intro_RCA_1940_Vacuum_Tube_Design.pdf

There is more, but ... 
e-mail for more specifics if you want.

Sincerely
Kevin
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References:
- [SI-LIST] PCB materials, solders, and components for VERY HIGH impedance applications
  - From: Steven Waldstein

[SI-LIST] Re: PCB materials, solders, and components for VERY HIGH impedance applications

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