voltages are 2 V +3% and 3.3 V +3% for the bridge
excitations, 12 V +5% for the +12 V excitation, and
22 V for the IEPE excitation.
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
for measurements of voltages from specially protected secondary
circuits. Such voltage measurements include signal levels, special
equipment, limited-energy parts of equipment, circuits powered
by regulated low-voltage sources, and electronics.
Caution
Do not connect the NI 9218 to signals or use
for measurements within Measurement Categories II,
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 9218 Getting Started Guide
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© National Instruments
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