The NI USB-6251 Mass Termination is a bus-powered, 16-bit multifunction DAQ module engineered for precision data acquisition across analog, digital, and timing domains. It delivers 16 single-ended analog inputs at 1.25 MS/s per channel and 1.00 MS/s aggregate, paired with two 16-bit analog outputs capable of 2.86 MS/s single-channel update rates. The device provides 24 digital I/O lines—including 8 clocked channels—plus two 32-bit counters/timers with 50 ns timing resolution. Mass termination connectors streamline integration into fixed installations, while USB connectivity and NI Signal Streaming enable high-speed bidirectional data transfer. Housed in a compact 7.4 in. × 6.73 in. × 1.75 in. enclosure weighing 12.8 oz, it operates across 0 °C to 45 °C and maintains 10 GΩ input impedance across its measurement range.
Technical Specifications
Analog Inputs
• 8 differential or 16 single-ended channels
• 16-bit resolution
• 1.25 MS/s single-channel; 1.00 MS/s aggregate sampling
• Input ranges: ±0.1 V, ±0.2 V, ±0.5 V, ±1 V, ±2 V, ±5 V, ±10 V
• ±11 V signal and common-mode working voltage
• 10 GΩ input impedance
Analog Outputs
• 2 channels, 16-bit resolution
• 2.86 MS/s single-channel; 2.00 MS/s per-channel update rates
• ±5 V, ±10 V output ranges
• ±5 mA output current drive
Digital I/O & Timing
• 24 digital I/O lines (8 clocked)
• 2 × 32-bit counters/timers
• 50 ns timing resolution
• Digital triggering and synchronization supported
– Key Features
• USB interface with mass termination connectors
• NI Signal Streaming for bidirectional high-speed USB data transfer
• DC-coupled analog inputs and outputs
• Compact, space-efficient design for portable or embedded systems
– Typical Applications
Signal monitoring, sensor data acquisition, real-time control loops, waveform generation, and timing-critical measurement systems requiring multi-channel I/O on a single USB device.
– Compatibility & Integration
NI-DAQmx driver included. Supported environments: LabVIEW, LabWindows/CVI, Measurement Studio for Visual Studio.NET. DAQ Assistant configuration utility reduces setup time.
