I'm afraid that this is what happens when people (mostly in National
Committees) accept circulated documents 'because the WG members are
bound to have done a good job', without actually assuming the opposite
and go looking for problems. It's all to easy to do.
I /hope I'm wrong in this case/ and someone on CISPR/I WG1 will soon
explain all, but is certainly seems that, even if the standard is in
fact totally correct and practicable, it needs clarification.
You say CISPR 32:2012, but the current edition is 2015:
https://webstore.iec.ch/searchform&q=CISPR%2032 There were a lot of
proposals for change when the 2012 edition was published.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2019-08-09 20:17, Andrew Perry wrote:
My friends,
I am preparing to drill new threaded holes in our chamber floor, where
we will perform our CISPR32 (2012) conducted emissions tests. Looking
at Table D.1 and figure D.2, I am trying to figure out where to place
our two AMNs and single AAN to meet all of the distance and length
requirements.
Our setups will look very much like figure D.2, but shape and number
of AE will vary (naturally). What boggles my mind is how to have
fixed positions for the AMNs and AAN (I don't want to turn my chamber
floor into Swiss cheese), and avoid having to rearrange the EUT on the
test table when switching from AC port measurement to let's say,
network port measurement. Figure D.2 seems to suggest that its layout
permits exactly what I'm looking for. However, reading the note of
the figure (no longer a note in version 2015, by the way) and looking
at the distance requirements in table D.1, I don't understand how
figure D.2 permits EUTs to become AEs, without rearrangement.
For example, let's say you are measuring the middle EUT using the AAN,
then how can the PSU at the left be >= 0.8m from the active AAN? The
note says that if the device is AE, then it shall be at a >= 0.8 m
distance. So this PSU now being AE, shouldn't it be at more than 0.8
m from the AAN? Is the figure misleading in indicating that each
device can be EUT or AE at its current position? Keep in mind that
Table D.1 also states that all cables must be kept at 0.4 m from the
vertical plane. CISPR22 had figures that showed AMNs all over the
place, even bonded to the vertical plane. CISPR32 now shows all
AMN/AAN at the 40 cm line. D.2.2 text still allows AMN/AAN to be
bonded to the vertical plane, but then how do you maintain the 40 cm
distance for the cables if their endpoint is essentially at a few
centimeters from the plane?
Another question is about this "new" insulation pad underneath the
table. There is a maximum thickness of 0.15m specified for this
insulation, but no minimum. Are the cable outer sleeves enough? Is a
coat of enamel paint on a metal turntable enough? I understand that
bare wires shouldn't make contact with ground if they're not supposed
to, but is an insulation pad really necessary when cables are not bare?
Please let me know what your thoughts are, there must be something I'm
not seeing here.
AP
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