Справочник Пользователя для National Instruments NI 9403E

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.

Do not connect the NI 9403E to signals or use 

for measurements within Measurement Categories II,
III, or IV.

This product meets the requirements of the following standards of 
safety for electrical equipment for measurement, control, and 
laboratory use when installed in a suitable enclosure:

•

IEC 61010-1, EN 61010-1

•

UL 61010-1, CSA 61010-1

For UL and other safety certifications, refer to the 

product label or the 

 section.