RE: ESD protection for test equipment

2002-10-11 Thread jrbar...@iglou.com 

Doug,
When I was developing network adapters at my previous company, we would use
a long cable-- close to the maximum length specified-- between the
equipment we were electrostatic discharge (ESD) testing and our support
equipment.  These long cables were wound on the reels that the cable came
on, to give us some common-mode choke effect against ESD, electrical fast
transient/burst (EFTB), and other surges during the immunity tests.  (It
also made it easier to haul them around.)

We also reserved some hubs and host computers just for immunity testing, so
that we wouldn't damage the good hosts/hubs we used for emissions testing. 
I usually reserved one of my prototypes for emissions testing, and a second
for immunity tests.  

Now, testing products for clients, I usually get only one unit for the
verification/certification tests.  So I try to run emission tests first,
followed by tests that have a low chance of damaging the product
(harmonics, flicker, radiated immunity, conducted immunity, magnetic field
immunity, voltage dips), and finish up with tests that have a high
probability of damaging the product (EFT/B, surge, ESD).

   John Barnes KS4GL
   dBi Corporation
   http://www.dbicorporation.com/



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ESD protection for test equipment

2002-10-10 Thread Douglas_Beckwith 

Hi All,
We have run into a problem where the ESD discharges to the EUT are getting
onto the 100base T ethernet lines and damaging the support equiment  Does
anyone know of a commercially available box that we could put onto or in
series with the Cat 5 cable ethernet line that would provide ESD protection
for the equipment used to support the EUT during ESD testing, i.e. Hub,
ethernet switch etc.  We have fried a couple of hubs this way, and I was
wondering if there was a ready made solution. I'm sure we are not the only
ones who have encountered this, so any ideas are welcome.

Regards

Doug Beckwith
Mitel Networks


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