National Instruments NI USB-9234 - Manual (Page 20)

NI USB-9234 User Guide and Specifications 20 ni.com
Power Requirements
Current consumption from USB.............500 mA, max
Suspend mode..................................2.5 mA, max
Bus Interface
USB specification ...................................USB 2.0 Hi-Speed
Physical Characteristics
Dimensions .............................................12.1 cm
× 8.6 cm × 2.5 cm
(4.75 in.
× 3.37 in. × 0.99 in.)
Weight ....................................................Approx. 250 g (8.8 oz)
Safety
If you need to clean the module, wipe it with a dry towel.
Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-earth ground.........................±30 V max,
Measurement Category I
Isolation
Channel-to-channel..........................No isolation between channels
Channel-to-earth ground..................No isolation between channels
and earth ground
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.
Caution Do not connect the NI USB-9234 to signals or use for measurements within
Measurement Categories II, III, or IV.