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 9221 with screw
terminal or NI 9221 with spring terminal to signals or
use for measurements within Measurement Categories
III or IV.
NI 9221 with DSUB Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-COM
±60 VDC maximum
Channel-to-channel
None
Channel-to-earth
Continuous
60 VDC, Measurement
Category I
Withstand
1,000 Vrms, verified by a 5 s
dielectric withstand test
Measurement Category I is for measurements performed on
circuits not directly connected to the electrical distribution system
referred to as
MAINS
voltage. MAINS is a hazardous live
electrical supply system that powers equipment. This category is
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NI 9221 Getting Started Guide