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Connect only voltages that are within these limits.

Channel-to-COM

................................... ±30 V max, 

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.

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).

The USB-9211/9211A is not certified for use in hazardous locations.

The USB-9211/9211A device is intended for indoor use only.

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

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

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

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