Sinking Digital Output Module with Programmable Current Limits Operating Instructions and Specifications

NI 9478 Operating Instructions and Specifications 16 ni.com
Example One
Yo u are driving a load with 2.0 meters of cable through a cycle in
which the NI 9478 is on and passing 1.25 A of current for 40
μs,
then off for 10
μs. The output period is 50 μs (40 μs + 10 μs) so the
output frequency is 20 kHz. The channel uses 14.8% of the total
power budget, as shown in the following equation.
4% 1.25
2
()0.12% 2.0 0.2–()1.25
2
()0.04% 1.25 1+()+[]20+ 14.8%=