National Instruments 779640-01, User Manual, Page: 15 / 20

© 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
μ
s
Minimum low pulse width ..................... 180
μ
s
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
μ
A 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)