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© National Instruments Corporation 17 USB-9211/9211A User Guide and Specifications
Voltages
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).
Hazardous Locations
The USB-9211/9211A is not certified for use in hazardous locations.
Environmental
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