This has been an INTERESTING discussion.
I plead guilty to having worded my initial comment poorly; a smart
battery must be tested in a configuration that that duplicates the one
it is used in, and that exercises each of its functions; the question
Bob asked was about, "...batteries that communication with the charger
or EUT for charge rates, time left, overheating, etc." That clearly
requires some smart batteries be tested inside the powered equipment,
first because emissions they create may be shielded by that equipment,
and second, because attaching cables for testing in alone adds antennas
that both radiate emissions and are more efficient receptors for
immunity tests than a battery installed in the powered equipment and
shielded by it may be. If an external is used, it would be proper to
test that configuration as a stand-alone test as well as running the
pwored equipment with them installed..
In Ed's example batteries were normally connected to the powered
equipment with wires and it would be appropriate to test that not only
with cabling, but perhaps on a mannequin or a human torso equivalent
material. Whole body SAR, anyone?.
MIL-STD-461 requires wiring and cables used during a test be
"representative" of the aircraft wiring. I once saw a system for a
cargo/passenger aircraft tested (not my lab -- I was officially an
observer and helper on that project) with full-length wiring on
pegboards (still an improvement over spaghetti on the table), stacked on
top of each other to fit in a chamber. This is not really
representative of an aircraft and I suspect few tests of long cables in
a chamber really are. That is another issue. The relevance here is that
the test should be done in a way that both creates radiators equivalent
to the end use and receptors that will deliver equivalent RF to the
device under test. There's room here for some enterprising and
cash-flush (heh) lab to produce a White Paper.
VERY interesting discussion.
Cortland Richmond
On 8/23/2012 1234, Ken Javor wrote:
Re: "Smart" Batteries That is simply not true in the general case.
What about a 28 Vdc battery that backs up the essential bus on an
aircraft? What about a MANPACK battery that is discharged while being
worn, and connected to a mains or generated-powered charger after the
mission is over.
In the commercial world, what about a battery designed to be used in
an UPS? I have purchased several replacement batteries designed to
replace the OEM battery in same.
Ken Javor
Phone: (256) 650-5261
------------------------------------------------------------------------
*From: *Cortland Richmond <[email protected]>
*Reply-To: *<[email protected]>
*Date: *Thu, 23 Aug 2012 11:58:15 -0400
*To: *<[email protected]>
*Subject: *Re: "Smart" Batteries
"Smart" batteries are electronic subassemblies that don't work
properly outside of the equipment in which they are meant to be used
and must be tested in it.
Cortland Richmond
On 8/22/2012 1243, [email protected] wrote:
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