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National Instruments USB-6251 Multifunction I/O Device  

The NI USB-6251 is a Multifunction I/O Device by National Instruments. It comes in multiple connector variations, including screw terminal connectors (part numbers 779627-01, 779627-02, 779627-03, 779627-04, 779627-06, 779627-07, 779627-09, 779627-10), BNC connectors (part numbers 780115-01, 780115-02, 780115-03, 780115-04, 780115-06, 780115-07, 780115-09, 780115-10, 194929F-03L), and mass terminal connectors (part numbers 779694-01, 779694-02, 779694-03). This device offers data acquisition in a simple and portable form. It offers this facility through USB ports on laptops and for other portable computing platforms. The NI USB-6251 also implements synchronization procedures.

The USB 6251 NI has 8 differential or 16 single-ended analog input channels. This product offers a sampling rate of 1.25 MS/s for a single channel or 1.00 MS/s for multiple channels. These are the maximum sampling rates. This Multifunction I/O Device provides DC input coupling. The input range for this product is ±1 V, ±2 V, ±5 V, ±10 V, ±0.1 V, ±0.2 V, and ±0.5 V.  It provides the working voltage of ±11 V for signal mode as well as common mode. The input impedance value is 10 GΩ when the device is on or when the device is off. An important note to keep in mind is that the warm-up time for this National Instruments device is 30 minutes, and should be calibrated at least once in 2 years.

The USB 6251 National Instruments has two analog output channels. This Multifunction I/O Device updates itself at different rates for 1 channel and for 2 channels. For one channel, this value is 2.86 MS/s. For two channels, this rate is 2.00 MS/s per channel. This device additionally offers a timing resolution of 50 ns. The USB-6251 device provides an output range of ±5 V and ±10 V. This Multifunction I/O Device provides DC output coupling. The output current drive of this device is ±5 mA.

The screw terminal model of the USB 6251 weighs 10 oz, while the mass termination model weighs 12.8 oz. Additionally, the screw terminal model measures 10.5 x 6.73 x 1.75 in. in physical dimensions, the BNC model has the dimensions: 11.25 x 6.7 x 2.7 in., and the mass termination model measures 7.4 x 6.73 x 1.75 in. in dimensions. The NI device has recommended operating and storage temperature ranges of 0 ºC to 45 ºC and -20 ºC to 70 ºC respectively, a non-condensing humidity range of 10% RH to 90% RH.