There is provision for an artificial hand in leakage tests. Here, the
user acts as antenna while using the device and if that's the only
radiating "conductor" on a touch panel, that probably should not be
ignored (to avert field problems if nothing else). However, I don't
recall anything requiring an artificial user!
It would be interesting if a list member has tried the experiment of
having a real operator use the touchpad and seeing what resonances are
excited, so as to find a suitable wire equivalent. Other wires may make
this unnecessary.
I believe ports that MAY be used in normal operation, MUST be used
during testing. But to exercise them, one needs a signal that occurs
often enough to not slow down the test too much.
For Quasi-Peak testing, I'd use a signal long enough to allow fully
charging the QP detector time constant specified, so if a ping does not
last long enough to allow that time constant to charge, a longer test
signal should be used. This argues for a message.
Cortland Richmond
On 4/4/2012 1009, Mark Schmidt wrote:
Hi Grace,
In regard to your 1^st bullet, even though the touchpanel and the POE
injector are sold separately and offered as two separate items, the
potential of them being sold/bundled together with the intent of a
single solution coming from a single manufacturer does exist. I am of
the opinion that they need to be tested together. Bullets 2 and 3 are
very good questions that I do not have an answer for. I am sure the
group can help and look forward to their responses.
Mark Schmidt
*From:*Grace Lin [mailto:graceli...@gmail.com]
*Sent:* Wednesday, April 04, 2012 7:51 AM
*To:* EMC-PSTC@LISTSERV.IEEE.ORG
*Subject:* [PSES] Test Setup for a Display Powered by a PoE Injector
Dear Members,
Could you please give your comments on the test setup for a display
(touchpanel) powered by a PoE (power over Ethernet) injector? More
specifically:
1. Does the PoE injector need to be part of the EUT (equipment under
test) and placed on the turntable next to the EUT? Or, can the PoE
injector be placed remotely (under the ground plane or outside of the
chamber)? The PoE injector is marketed/packaged separately from the
EUT. Both the EUT and PoE injector are marketed by the same manufacturer.
2. There are two ports, in addition to the power port, from the PoE
injector: "PoE LAN" and "LAN". "PoE LAN" port connects to the EUT.
Need the "LAN" port of PoE injector be connected to LAN?
3. Need the "LAN" port of PoE injector be exercised? If yes, is Ping
command good enough?
Thank you very much for your time and look forward to hearing from you.
Best regards,
Grace Lin
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