National Instruments NI 9478 - Manual (Page 13)

© National Instruments Corp. 13 NI 9478 Operating Instructions and Specifications
Some applications require a large inrush current when a channel is
first turned on. If this inrush current exceeds the maximum current
limit threshold, you may need to disable overcurrent protection by
programming the channel to have no current limit. Refer to the
software help for more information about configuring current
limits. Visit
ni.com/info and enter cseriesdoc for information
about C Series documentation.
Caution The NI 9478 is not protected against output
overcurrent or short-circuit conditions when overcurrent
protection is disabled. If you disable overcurrent
protection, ensure that the wiring is correct and that you
are operating the NI 9478 within the specifications.
The total amount of current that you can switch with a channel
depends on the duty cycle of the channel, the ambient temperature,
the switching frequency, and the amount of current switched by
other channels within the same module at the same time. Refer to
the
Safe Operating Current section for more information about the
current specifications.