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properly insulated from human contact. You must use
the NI 9932 connector backshell kit to ensure that the
terminals are not accessible.
NI 9421 with Screw/Spring Terminal Safety
Voltages
Connect only voltages that are within the following limits:
...........................................................
Channel-to-COM
30 V max
Isolation
...................................................
Channel-to-channel
None
Channel-to-earth ground
...........................................
Continuous
250 Vrms,
Measurement Category II
...........................................
Withstand
2,300 Vrms, verified by a
5 s dielectric withstand test
Measurement Category II is for measurements performed on
circuits directly connected to the electrical distribution system.
This category refers to local-level electrical distribution, such as
that provided by a standard wall outlet, for example, 115 V for
U.S. or 230 V for Europe.
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NI 9421 Getting Started Guide