PXI-6221 National Instruments

PXI-6221   National Instruments    Industrial control module spot

Maximum Working Voltage

Maximum working voltage refers to the signal voltage plus the common-mode voltage.

Channel-to-earth 11 V, Measurement Category I

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 lowvoltage sources, and electronics.

Caution Do not use for measurements within Categories II, III, or IV.

Note Measurement Categories CAT I and CAT O (Other) 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.

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