Thank you for your replies to my first inquiry.
In particular, George's observation that sec. 7.3.1 applies only to
post-installation tests made me realize that I missed the right point in the
standard, that is sec.7.2.2. I just don't understand why the guys who wrote the
document were not specific in the more important (and used) case of tests
performed in labs (those are mostly the ones used to verify compliance). So
they leave the door open to any possible combination of phase/neutral/ground
when applying the bursts to the AC line.
One important point that I didn't mention in my previous note was that the
failure is not specifically related to the printer, but to a LAN/Ethernet box
that is attached. Our OEM got 2 different printers to fail under the same
conditions (bursts with positive polarity @ 1kV applied to Line and Protective
Earth (PE) simultaneously) with the very same box attached. The printer stops
printing and go to a Ready state. You are able to make the printer Not Ready
and back to Ready, but it does not continue to print. the PC driving the
printer says the data timed out sending to the device.
The same printers don't fail when tested without this LAN box.
Our feeling is they want to pull us into working on the problem because the
vendor of the LAN box is not so willing or able to help.....
Of course any additional hints can be very helpful.
Paolo Roncone
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