Справочник Пользователя для National Instruments NI 9144

© National Instruments Corporation

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 system to signals or use for measurements within 

Measurement Categories II, III, or IV.

U.S. (UL)................................................ Class I, Division 2, Groups A, 

B, C, D, T4; Class I, Zone 2,
AEx nA IIC T4

Canada (C-UL)....................................... Class I, Division 2, Groups A, 

B, C, D, T4; Class I, Zone 2, 
Ex nA IIC T4

Europe (DEMKO).................................. Ex nA IIC T4

The NI 9144 chassis is intended for indoor use only, but it may be used 
outdoors if mounted in a suitably rated enclosure.

Operating temperature
(IEC 60068-2-1, IEC 60068-2-2)........... –40 to 70 °C

To meet this operating temperature range, follow the guidelines in the installation 

instructions for your EtherCAT system.

Storage temperature
(IEC 60068-2-1, IEC 60068-2-2)........... –40 to 85 °C

Ingress protection ................................... IP 40

Operating humidity
(IEC 60068-2-56) ................................... 10 to 90% RH, noncondensing

Storage humidity
(IEC 60068-2-56) ................................... 5 to 95% RH, noncondensing

Maximum altitude .................................. 2,000 m

Pollution Degree (IEC 60664) ............... 2