This sounds similar to the radiated emissions tests following EN55014-1:1997
(emissions for household appliances).  The unit of measure is also dBpW.

An absorbing clamp is placed on the AC power cord, and moved along the cord
looking for maximum emissions.  A table of correction factors converts from the
observed measurement unit of dBuV to dBpW.

On Fri, 26 Oct 2001 15:05:48 -0500, "Ken Javor" <[email protected]>
wrote:
>A NASA colleague of mine has EN 55013 test results on an electronic
>keyboard.  The test results are a graph of dBpW vs. frequency, with a
>conversion chart for getting from measured data in dBuV to dBpW to be
>plotted against the limit.  I have a 1975 version of CISPR 13 and can find
>nothing that leads to a dBpW limit.  The keyboard is battery powered so I
>assume the test was radiated in nature.  Any ideas out there on what was
>measured?

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