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Bus Interface
Physical Characteristics
Safety
© National Instruments Corporation
USB specification
NI USB-9211 .................................. USB 2.0 Full-Speed
NI USB-9211A ............................... USB 2.0 Hi-Speed
Dimensions ............................................ 14 cm × 8.6 cm × 2.5 cm
Weight .................................................... Approx. 350 g (12.3 oz)
Screw-terminal wiring............................ 12 to 24 AWG wire with 10 mm
Torque for screw terminals .................... 0.5–0.6 N · m (4.4–5.3 lb · in.)
If you need to clean the module, wipe it with a dry towel.
Safety Voltages
Connect only voltages that are within these limits.
Channel-to-COM ................................... ±30 V max,
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
Continuous............................... 250 V
(5.51 in. × 3.37 in. × 0.99 in.)
(0.39 in.) of insulation stripped
from the end
Measurement Category
Measurement Category II
21
NI USB-9211/9211A User Guide and Specifications
, 5 seconds max
rms
,
rms
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