Ferrite Cores on USB cable ... needed ?

K

Kurse

n00b
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Oct 25, 2005
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Just picked up a new scanner and in the process of installing the software I started reading the manual. (New concept) I found the following line ... "Use of a shielded cable with the ferrite cores(s) provided with the scanner is necessary to comply with the technical requirements of the EMC Directive"

The question(s) I have are .. Are the ferrite cores there to prevent problems with the scanner or with other devices near the scanner and will my scans be affected by using a standard USB 2.0 cable without ferrite cores?

Thxs in advance for the info.

d
 
they are there to clean the signal up. its only really an issue around unsheilded speakers, and maybe a moniter. but even then, its a long shot
 
The ferrite was added to the cable so that the scanner passes FCC part 15 b, iirc. It means the manufacturer ran out of time and it was their last ditch effort to get it to pass FCC stantards. It will not affect operation of the device, however, it could cause some issues with other electronic devices near it.

 
Zoobaby nailed it.

One option when a product won't pass its FCC emissions / susceptability testing is to use ferrites on the cables, but that means that the manufacturer has to ship a cable with ferrites on it along with the product. It's a relatively expensive option, but it's often cheaper than redesigning the whole product.

Long and short of it is that your hardware should work fine without the ferrites on the cable.

Regards - B.B.S.
 
I was guessing as much. It wouldn't be so bacd except the cable included is only about 2" long .. well maybe longer :) but still, way to short to run all the way around a desk through cable management for a nice clean look. I'll just make sure its not running near my modem and router.

Thanks for the info. Cheers!
 
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