National Instruments NI 9482 User Manual And Specifications page 17

CHa-to-CHb...................................... 250 V
Isolation
Channel-to-channel
Continuous ........................... 250 V
Withstand ............................. 1,400 V
Channel-to-earth ground
Continuous ........................... 250 V
Withstand ............................. 2,300 V
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.
Caution
for measurements within Measurement Categories III
or IV.
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max,
rms
Measurement Category II
rms
, verified by a 5 s
rms
dielectric withstand test
rms
, verified by a 5 s
rms
dielectric withstand test
Do not connect the NI 9482 to signals or use