Just declassified and released after 8 years from FOIA request:

NSA TEMPEST 01-02 NONSTOP Evaluation Standard (Oct 2002):

http://cryptome.org/2014/05/nsa-tempest-01-02-oct-02.pdf (3.2MB)

Compare NONSTOP Techniques from 1975:

http://cryptome.org/nacsem-5112.htm

Both heavily redacted but comparison may fill in missing.

The TEMPEST researchers at Cambridge may have full documents.
What say?

Our compilation: http://cryptome.org/nsa-tempest.htm