H
H. M.
- Jan 1, 1970
- 0
On quite a few industrial grade PCBs which are mounted in plastic
enclosures, I saw these frame earth tracks going a long the perimeter of
the PCB. They typically are on both sides of the PCBs, form a loop, top
and bottom track are connected with plenty of vias and are connected to
the protective earth terminal of the enclosure. The circuit ground (GND)
is typically connected via a 1MOhm/10nF to this track.
The purpose seems to be an EMI shield.
Is this a useful thing and recommended to do on a 2-layer PCB?
As the track forms a loop I am concerned that it could be EMI wise
counter productive.
Ricky
enclosures, I saw these frame earth tracks going a long the perimeter of
the PCB. They typically are on both sides of the PCBs, form a loop, top
and bottom track are connected with plenty of vias and are connected to
the protective earth terminal of the enclosure. The circuit ground (GND)
is typically connected via a 1MOhm/10nF to this track.
The purpose seems to be an EMI shield.
Is this a useful thing and recommended to do on a 2-layer PCB?
As the track forms a loop I am concerned that it could be EMI wise
counter productive.
Ricky
