National Instruments NI 9481E - Manual (Page 10)

NI 9481E Operating Instructions and Specifications 10 ni.com
Safety
Safety Voltages
Connect only voltages that are within the following limits.
CHa-to-CHb...................................... 250 V
rms
max,
Measurement Category II
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 Do not connect the NI 9481E to signals or use
for measurements within Measurement Categories III
or IV.
Isolation
Channel-to-channel
Continuous ........................... 250 V
rms
(Basic insulation)
Withstand ............................. 1,400 V
rms
, verified by a 5 s
dielectric withstand test