National Instruments 8-Channel 用户手册

Channel-to-COM ....................................30 V max

Isolation

Channel-to-channel..........................No isolation between channels

Channel-to-earth ground

Withstand .................................1,000 V

rms

, verified by a 5 second 

dielectric withstand test

Continuous ...............................60 VDC, 

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 low-voltage sources, and electronics.

The NI USB-9421 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

For UL and other safety certifications, refer to the product label or visit 

ni.com/certification

, search by model number or product line, and click the 

appropriate link in the Certification column.

The NI USB-9421 is not certified for use in hazardous locations.

The NI USB-9421 is intended for indoor use only. 

Operating temperature
(IEC60068-2-1, IEC 60068-2-2) ............0 to 60 °C 

Storage temperature
(IEC60068-2-1, IEC 60068-2-2) ............–40 to 85 °C