Hi Doug:
> There are four observation periods listed in para 6.2.4 of A14 (table Z1), I
> assume that I only have to pick the one that suitably qualifies my
> equipment's operation, or must I apply each one to determine the best period
> of observation?
>From my reading of prA14 (I don't have A14), you must
decide which of the four behaviors best fits your
product. I doubt that performing each measurement in
turn would be the best way to determine your equipment
behavior.
I would connect the EUT to a current-measuring 'scope
(slowest sweep speed), turn on the EUT, and observe
the input current as a function of time for a period
of ten minutes or longer. From this record, you can
determine the EUT behavior as one of the 4 types.
> The equipment in question is bench/portable test equipment
> with and internal switching power supply (approx 150W) whose represented
> load does not change after initial turn on.
>From your description, "load does not change after
initial turn on," your equipment would be "quasi-
stationary." This means that you simply make the
harmonic current measurements without regard to the
EUT function.
> Question #2, Repeatablity per para 6.2.3.1, can you verify repeatablity by
> evaluating the individual 1.5 second smoothed rms values over your test
> observation period or must we repeat the entire test at a later time to
> prove repeatablity?
I'm not sure I understand your question. I would
think that the concept of repeatability is that of
repeating the entire test.
Best regards,
Rich
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