| Electronics > Projects, Designs, and Technical Stuff |
| Conducted emissions CISPR 22 power output |
| (1/1) |
| dpape:
Hello, I'm finishing the design of a linux board which contains various peripherals (USB, Ethernet, ...) and I'm now doing some pre-compliance conducted emissions testing on the workbench. This is a telecomunications product for the EU so I'm using the CISPR22 standard for conducted emissions. The board is fed with 5VDC power input but also has a 12VDC @ 500mA power output (DC DC step-up). I'm now not sure how I'm supposed to connect the LISN and which maximum levels to use. I don't feel that this is a 'telecommunications port' but I don't think this is a 'mains' terminal either. Can anybody shed some light on this? Kind regards, Daan |
| T3sl4co1l:
What would connect to it? Is it, say, replacing an external wall-wart or something? Tim |
| dpape:
The 12V power output will supply power to one of the peripherals of the DUT. For example a ticket printer wich needs 12V input. |
| T3sl4co1l:
Then I would guess it counts as another comm pair, since it's in a loop with them. If you specify a type of e.g. ticket printer, of known cable length and placement, then you can say "all of this is my equipment" and test it as a whole. But that's a no-no if it's unknown cable length and such. Tim |
| dpape:
Hi Tim, Thank you for the reply. The type of ticket printer and cable length is unknown. I'll just test it with the 5 uH LISN just as it would be a comm port. Kind regards, Daan |
| Navigation |
| Message Index |