The NI PCI-6225 is a PCI-based multifunction data acquisition board delivering 80 analog input channels, 2 analog outputs, 24 digital I/O lines, and two 32-bit counter/timers. Operating at 250 kS/s with 16-bit resolution across configurable voltage ranges, it supports both single-ended and differential measurements with integrated overvoltage protection. The card integrates signal conditioning compatibility, programmable digital I/O, and quadrature encoder support, making it suitable for laboratory automation, industrial measurement, design verification, and manufacturing test environments.
Technical Specifications
Analog Inputs
• 80 single-ended or 40 differential channels
• 16-bit resolution
• 250 kS/s maximum sampling rate per channel
• Input ranges: ±10V, ±5V, ±1.0V, ±0.2V
• Absolute accuracy (±10V range): 3,100 µV
• 4,095-sample FIFO buffer
• Crosstalk: -71 dB to -90 dB (64-channel separation)
• Overvoltage protection and high input impedance
Analog Outputs
• 2 channels, 16-bit resolution
• 833 kS/s maximum update rate
• ±10V output range
• 6 µs settling time (full-scale step, 15 ppm)
• 15 V/µs slew rate with overdrive protection
Digital I/O
• 24 bidirectional channels, individually programmable
• ±20V voltage protection
• 8 correlated clocked lines at 1 MHz
Counters/Timers
• Two 32-bit counters/timers supporting frequency division, pulse generation, and edge counting
• Quadrature encoder input support
– Key Features
• Bus-powered PCI interface requiring no external supply
• Multiple data transfer modes: interrupts, DMA, programmed I/O
• Two VHDCI connectors for signal routing
• Compact form factor: 3.8 in. × 6.1 in., 0.23 lb
– Compatibility & Integration
The PCI-6225 operates with NI-DAQmx driver and configuration utility, supporting LabVIEW, C/C++, Visual Basic, and .NET. It integrates with SCC and SCXI signal conditioning modules for expanded sensor and high-voltage measurement capability.
