National Instruments NI 9401 - Manual (Page 17)

© National Instruments Corp. 17 NI 9401 Operating Instructions and Specifications
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 9401 to signals or use
for measurements within Measurement Categories II,
III, or IV.
Safety Standards
This product is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement,
control, and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1
Note For UL and other safety certifications, refer to the
product label or visit ni.com/certification , search
by module number or product line, and click the
appropriate link in the Certification column.