Features

16 AI (16-bit, 1.25 MS/s), 2 AO (2.8 MS/s), 24 DIO PCI Multifunction I/O Device
The PCI-6251 offers analog I/O, correlated digital I/O, two 32-bit counters/timers, and analog and digital triggering. 
The device delivers low-cost, reliable DAQ capabilities in a wide range of applications from simple applications in laboratory automation,
 research, design verification/test, and manufacturing test. 
You can add sensor and high-voltage measurement capability to your device with SCC or SCXI signal conditioning modules. 
The included NI-DAQmx driver and configuration utility simplify configuration and measurements.