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 9220 with DSUB to
signals or use for measurements within Measurement
Categories II, III, or IV.
Safety Guidelines for Hazardous Voltages
You can connect hazardous voltages only to the
NI 9220 with spring terminal. Do not connect hazardous voltages
to the NI 9220 with DSUB.
If hazardous voltages are connected to the device, take the
following precautions. A hazardous voltage is a voltage greater
than 42.4 Vpk voltage or 60 VDC to earth ground.
Caution Ensure that hazardous voltage wiring is
performed only by qualified personnel adhering to local
electrical standards.
NI 9220 Getting Started Guide | © National Instruments | 5
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