Caution
Any excitation output voltage to earth ground
must remain below 60 VDC for each channel. To
determine excitation output voltage to earth ground for
a channel, add the maximum excitation voltage to the
maximum potential on pin 3. The maximum excitation
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
4
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NI 9218 Getting Started Guide
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