©
National Instruments Corporation
21
NI USB-9211/9211A User Guide and Specifications
Bus Interface
USB specification
NI USB-9211 .................................. USB 2.0 Full-Speed
NI USB-9211A ............................... USB 2.0 Hi-Speed
Physical Characteristics
Dimensions ............................................ 14 cm
×
8.6 cm
×
2.5 cm
(5.51 in.
×
3.37 in.
×
0.99 in.)
Weight .................................................... Approx. 350 g (12.3 oz)
Screw-terminal wiring............................ 12 to 24 AWG wire with 10 mm
(0.39 in.) of insulation stripped
from the end
Torque for screw terminals .................... 0.5–0.6 N · m (4.4–5.3 lb · in.)
Safety
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
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
