© National Instruments Corporation 15 USB-6525 User Guide and Specifications
Resolution .............................................. 32 bits
Counter measurements........................... Rising edge counting
Maximum input frequency..................... 5 KHz
Minimum high pulse width .................... 20 μs
Minimum low pulse width ..................... 180 μs
Bus Interface
USB specification .................................. USB 2.0 full-speed (12 Mb/s)
Power Requirements
USB
Input voltage ................................... 4.5 to 5.25 VDC in
configured state
Active current ................................. 150 mA max
Suspend current............................... 350 μA typ
Physical Characteristics
Dimensions
Without connectors ......................... 6.35 cm × 8.51 cm × 2.31 cm
(2.50 in. × 3.35 in. × 0.91 in.)
With connectors .............................. 8.18 cm × 8.51 cm × 2.31 cm
(3.22 in. × 3.35 in. × 0.91 in.)
I/O connectors ........................................ USB series B receptacle,
(2) 16 position (screw terminal)
plug headers
Screw-terminal wiring............................ 16 to 28 AWG copper conductor
wire with 10 mm (0.39 in.) of
insulation stripped from the end
Torque for screw terminals .................... 0.22 – 0.25 N · m
(2.0 – 2.2 lb · in.)
Weight
With connectors .............................. Approx. 87 g (3.1 oz)
Without connectors ......................... Approx. 64 g (2.3 oz)
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