National Instruments 9201 用户手册

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

channels

Channel-to-earth ground

Continuous ................................. 250 V

rms

, 

Measurement Category II

Withstand.................................... 2,300 V

rms

, verified by a 5 s 

dielectric withstand test 

Measurement Category II is for measurements performed on 
circuits directly connected to the electrical distribution system. 
This category refers to local-level electrical distribution, such as 
that provided by a standard wall outlet, for example, 115 V for U.S. 
or 230 V for Europe.

Do not connect the NI 9201/9221 with screw 

terminal to signals or use for measurements within 
Measurement Categories III or IV.