The NI PXI-6281 M Series PXI Multifunction I/O Module delivers high-performance data acquisition for PXI-based test systems. This module integrates 16 single-ended (or 8 differential) analog inputs with 18-bit resolution, 2 analog outputs, 24 digital I/O lines, and 2 counter/timers into a single slot. It captures analog signals at up to 625 kS/s per channel with ±11 V maximum working voltage and supports flexible input ranges from ±0.1 V to ±10 V. Digital I/O includes 8 correlated channels clocked to 10 MHz with 24 mA line drive for relay control. The 32-bit counter/timers operate at 80 MHz and handle timing, event counting, and PWM functions. DMA, interrupt, and programmed I/O data transfer modes integrate with NI-DAQmx driver software and LabVIEW/LabWindows/CVI environments.
Technical Specifications
Analog Input
• 8 differential or 16 single-ended channels
• 18-bit ADC resolution with no missing codes
• 625 kS/s maximum single-channel sample rate; 500 kS/s aggregate multichannel
• Input ranges: ±0.1 V, ±0.2 V, ±0.5 V, ±1 V, ±2 V, ±5 V, ±10 V
• ±11 V maximum working voltage (signal + common mode)
• 110 dB CMRR (DC to 60 Hz)
• >10 GΩ input impedance (device on); 820 Ω (device off)
• ±100 pA input bias current
• 750 kHz small signal bandwidth (filter off); 40 kHz (filter on)
• 2,047-sample input FIFO; 4,095-entry scan list memory
• ±25 V overvoltage protection (device on); ±15 V (device off)
Analog Output
• 2 channels, 16-bit resolution
• 2.8 MS/s maximum update rate
• ±5 mA output current drive; 0.2 Ω output impedance
• 16-bit monotonicity guaranteed
Digital I/O
• 24 total lines; 8 correlated channels
• 10 MHz clocked operation
• 24 mA line drive capability
• Programmable debouncing filter (125 ns, 6.425 µs, 2.56 ms, or disable)
Counter/Timer
• 2 × 32-bit counter/timers
• 80 MHz operating frequency
– Key Features
• DC input coupling with flexible signal conditioning
• Programmable offsets and output ranges for waveform resolution
• DMA scatter-gather, interrupt, and programmed I/O data transfers
• NI-DAQmx driver integration
– Typical Applications
• Automated test equipment (ATE) systems
• Multi-channel data logging and signal analysis
• Real-time control and monitoring in instrumentation
• Timing and event-driven measurement tasks
– Compatibility & Integration
Works with LabVIEW, LabWindows/CVI, and NI-DAQmx software frameworks within PXI chassis environments.
