circuits. Such voltage measurements include signal levels, special
equipment, limited-energy parts of equipment, circuits powered
by regulated low-voltage sources, and electronics.
Caution
If using in Division 2 or Zone 2 hazardous
locations applications, do not connect the NI 9238 to
signals or use for measurements within Measurement
Categories II, III, or IV.
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 9238 to signals or use
for measurements within Measurement Categories III
or IV.
Note
Measurement Categories CAT I and CAT O are
equivalent. These test and measurement circuits are not
intended for direct connection to the MAINS building
installations of Measurement Categories CAT II,
CAT III, or CAT IV.
NI 9238 Getting Started Guide
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© National Instruments
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