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NI 9411 Operating Instructions and Specifications
20
ni.com
Safety
Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-COM
or V
s
u
p
-to-COM ................................ 30 V max,
Meas
u
rement Category I
Isolation
Channel-to-channel .................... None
Channel-to-earth gro
u
nd
Contin
u
o
u
s ........................... 30 V
rms
, 42.4 V
pk
, 60 VDC
Withstand ............................. 400 V
rms
, verified by a 5 s
dielectric withstand test
Meas
u
rement Category I is for meas
u
rements performed on
circ
u
its not directly connected to the electrical distrib
u
tion system
referred to as
MAINS
voltage. MAINS is a hazardo
u
s live electrical
s
u
pply system that powers eq
u
ipment. This category is for
meas
u
rements of voltages from specially protected secondary
circ
u
its. S
u
ch voltage meas
u
rements incl
u
de signal levels, special
eq
u
ipment, limited-energy parts of eq
u
ipment, circ
u
its powered by
reg
u
lated low-voltage so
u
rces, and electronics.
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