©
National Instruments Corp.
13
NI 9478 Operating Instructions and Specifications
Some applications req
u
ire a large inr
u
sh c
u
rrent when a channel is
first t
u
rned on. If this inr
u
sh c
u
rrent exceeds the maxim
u
m c
u
rrent
limit threshold, yo
u
may need to disable overc
u
rrent protection by
programming the channel to have no c
u
rrent limit. Refer to the
software help for more information abo
u
t config
u
ring c
u
rrent
limits. Visit
ni.com/info
and enter
c
s
erie
s
doc
for information
abo
u
t C Series doc
u
mentation.
Caution
The NI 9478 is not protected against o
u
tp
u
t
overc
u
rrent or short-circ
u
it conditions when overc
u
rrent
protection is disabled. If yo
u
disable overc
u
rrent
protection, ens
u
re that the wiring is correct and that yo
u
are operating the NI 9478 within the specifications.
The total amo
u
nt of c
u
rrent that yo
u
can switch with a channel
depends on the d
u
ty cycle of the channel, the ambient temperat
u
re,
the switching freq
u
ency, and the amo
u
nt of c
u
rrent switched by
other channels within the same mod
u
le at the same time. Refer to
section for more information abo
u
t the
c
u
rrent specifications.
