NI USB-6218 Isolated, Multifunction DAQ Device

The NI USB-6218 is an isolated, multifunction data acquisition device that integrates analog inputs, analog outputs, digital I/O, and counter/timers in a single USB-connected unit. Designed for industrial, laboratory, and research applications, it delivers 16-bit resolution across all analog channels with software-selectable input and output ranges from ±0.1 V to ±10 V. The reinforced isolation architecture (250 Vrms working voltage, 50 Vrms transient) eliminates ground loops and preserves signal integrity in electrically noisy environments.

Technical Specifications

Analog Input: 32 single-ended or 16 differential channels, 16-bit resolution, 1 MS/s aggregate sampling, 15-bit ENOB at 100 kS/s, 150 µVrms noise at 50 kS/s (10 V range), 80 dB CMRR at 50 Hz, 8th-order antialiasing filter. Analog Output: 4 channels, 16-bit resolution, 2 MS/s aggregate output rate, <5 mVrms noise, 6 V/µs slew rate. Digital I/O: 24 channels, software-configurable per port (0–7, 8–15, 16–23), 5 V/1 mA output drive, 100 kΩ selectable pull-up/pull-down resistors. Counter/Timers: 2 general-purpose channels, 32-bit resolution, 100 MHz maximum input frequency, quadrature encoder support. Isolation: Reinforced isolation, 250 Vrms working voltage, 50 Vrms transient voltage, 230 Vrms rated impulse voltage, Pollution Degree 2, Overvoltage Category II, device-to-ground and channel-to-channel isolation. Synchronization: Onboard clock.

Key Features

• Simultaneous multifunction I/O: 32 analog inputs, 4 analog outputs, 24 digital I/O, 2 counter/timers


• DC coupling on analog input and output channels


• Software-selectable input ranges for precise gain matching


• Dual isolation architecture protects against ground potential differences


• Logic input thresholds: 0.8 V max (Low), 2.0 V min (High)

Typical Applications

• Industrial process monitoring and control


• Multi-channel sensor data logging


• PWM and frequency measurement


• Quadrature encoder signal acquisition


• Test and measurement in high-noise environments

Compatibility & Integration USB connectivity enables direct connection to PCs without additional hardware. NI software frameworks and driver support simplify integration into measurement and control systems.