National Instruments NI 9478 - Manual (Page 14)

NI 9478 Operating Instructions and Specifications 14 ni.com
Overcurrent Refresh
The NI 9478 provides an overcurrent refresh setting that enables
a channel to automatically recover within the specified overcurrent
refresh period if the channel exceeds its current limit threshold.
If overcurrent refresh is disabled, the channel remains off after an
overcurrent condition until software sends a command to turn the
channel back on. Refer to the software help for more information
about overcurrent refresh. Visit
ni.com/info and enter
cseriesdoc for information about C Series documentation.
Safe Operating Current
The maximum allowable output current depends on the output
frequency and cable lengths. Higher output currents, higher output
frequencies, and longer cable lengths can contribute to power
dissipating and heat increasing in the NI 9478. The
Specifications
section gives allowable current and frequency specifications if you
use 2 meters of cabling. For other operating conditions, you can
find the safe operating specifications for the NI 9478 by calculating
the percentage of the total allowable power each output channel
dissipates given the output current, frequency, and cable length