Isolation, Grounding and Shielding 219
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
5.4.4 Shielding
As a matter of principle, the use of shielded and grounded cables is necessary for conforming to the EMC
and noise suppression parameters.
In many cases the use of a cost-effective, multi-wire, single shielded cable is adequate (even for many
cables).
Single shielding
But some cases can require double-shielded cables, meaning a common, grounded (CHASSIS) sheath, in
which (perhaps multiple) individual coaxial lines are contained.
The following situation in particular can require double shielding in order to protect against noise.
"high" internal resistance of the signal source (> 100 )
ungrounded signal sources (isolated or having high impedance to the CHASSIS and/or power supply
reference ground)
Double shielding:
To avoid compensation currents, always connect the shielding to one side (potential) only.
To Next Page
Loading...
