National Instruments 4-Channel 用户手册

If you need to clean the module, wipe it with a dry towel.

Connect only voltages that are within these limits.

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

Isolation

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

Channel-to-earth ground

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

rms

, 5 seconds max

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

rms

, 

Measurement Category II

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 use 
this module with Measurement Category III or IV voltages.

Connect only voltages that are within these limits.

AI+-to-AI–..............................................±30 V max

Isolation

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

Channel-to-earth ground

Withstand .................................1,500 V

rms

, 5 seconds max

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. Do not 
use this module with Measurement Category II, III, or IV voltages.