8
Introduction
3. Introduction
USB interfaces in stationary computers unfortunately have the basic
drawback of having no galvanic isolation for the signal lines.
In many applications in the consumer world this limitation is irre-
levant, since the USB devices connected to the PC are generally
supplied through the bus and do not have any reference to a second
ground or to the ground conductor.
In the areas of measurement reading, process control or for example
medical technology, galvanic isolation of the connected devices is
mandatory in order to prevent ground loops on the USB line.
Wiesemann & Theis therefore offers USB Isolators which are descri-
bed on the following pages along with their technical specifications
and wiring examples.
For up-to-date information on new developments on the Internet, go
to http://www.wut.de or the e-mail short infos available from the W&T
Interface Club, which you can sign up for at the W&T Hompage.
