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.
4 | ni.com | NI 9421 Getting Started Guide
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