Measurement Computing DBK Part 2 - Manual (Page 240)

DBK208, pg. 4 987594 DBK Option Cards and Modules
1.
Provide raceways (protective wiring routes) for all external I/O wiring.
2.
Keep external I/O wiring away from ribbon cables.
3.
Keep external I/O wiring away from low-voltage signal wiring.
4.
Provide appropriate strain-relief and physical restraint to ensure that the wiring is held securely in the
intended position, and without strain.
5.
Ensure that all wiring with >50V potential is identified by the appropriate color codes and that
warning labels are clearly visible.
6.
Provide physical protection for the I/O interface board. The level of protection is dependent upon the
board’s operating environment.
Partial DBK208
Power
The DBK208 requires an external isolated 5 volt DC supply
with at least 0.25 amp current capacity. External power attaches
to the DBK208 via on-board screw terminal connections. The
board contains capacitors to filter input noise from the power
supply.
Over-current protection is provided by an on-board 0.5 amp
reset fuse in series with the 5 volt supply. Protection from
over-voltage and reverse polarity power conditions is provided
by a 6.8V zener diode.