I apologize if I am asking questions that have already been discussed
in the past. I know there was a lengthy thread a few months ago on
this standard which has me still scratching my head.
Here are my questions:
1. What criteria determines if the EUT needs to be tested or not? (I
assume everything). The EN50082-1 refers to I/O cables longer than 3
meters. If the EUT only has short I/O interfaces does the EUT need to
be tested? For instance, if my only interface is a standard PC
parallel port interface does this port have to be tested?
2. What about an EUT that has no qualifying I/O (Only AC mains)?
There was a discussion that there is no path for the test current if
the only CDN in the test setup is the one on the mains. Is this true?
Isn't there a return path through the safety ground? The standard
doesn't show such a configuration.
2b. What about EUT with dozens of I/O? How many CDNs can be attached
before it interferes with the test results?
3. What about class 2 devices with no ground? Should a ground be
added? Should it be a 150 ohm terminator?
3. The -6 standard refers to several different kinds of CDNs such as
CDN-T2, -T4, -T8, AF2, -S1, M1. What are typical interfaces for these
CDN?
4. I know that if I don't have a suitable CDN I can use the Clamp
method. Can the clamp be used on shielded cables? If not then how are
shielded cables tested?
5. I have customers that insist that I do not cut their AC power cords
to connect the CDN to the EUT. Can the Clamp be used on the AC mains?
What if a 30cm grounding strap is added for the return path? or 150
ohm terminator?
6. What is the -6 test trying to do? What is it simulating? What
current path is it trying to find through the EUT? Because every EUT
is different it would help to understand the purpose of this test so
the test setup can be determined by the Test Engineer.
Thanks for all responses.
Brian
