DTS SLICE NANO - Page 74

SLICE Ground i ng a nd Sh i e l d i ng Ov e rv i e w
Shield sensor cables
• Use shielded sensor cables. The shield provides a path for EMI/RFI energy to flow to the
DAS ground and enclosure, thus reducing effects on sensor signals.
•
Connect the sensor cable shield on the DAS side only to the
“
Shield
”
or ground pin on the
•
Connect
the
sensor
cable
shield
on
the
DAS
side
only
to
the
Shield
or
ground
pin
on
the
SLICE.
• Do not connect the shield at bo th ends. Connecting the sensor cable shield at both ends
will cause large ground-loop currents that can increase noise or cause damage.
• PC Groundin
g
?
g
• This is more important than you might think.
• If the Laptop used to communicate with SLICE is powered from a source that has a
significantly different ground potential than the SLICE system, communication with the
SLICE can be impaired. In severe cases damage to the laptop or SLICE c an occur.
• Either run the la
p
to
p
on batter
y
p
ower or use a voltmeter to make sure the AC outlet
p p y p
g
round is not at a s i
g
nificantly different potential than the
g
round connected to the test
article or vehicle.
• Carefully consider routing and cable design for any high current signals to air bags,
cameras, lights, etc.
•
Route these cables away from sensor wiring
•
Route
these
cables
away
from
sensor
wiring
.
• Cross sensor wiring at 90" angles if the cables must cross.
© 2009-2010 DTS Principles of Dynamic Data Acquisition