USB-6251

Part number(s):

779627-11

779627-12

779694-12

779694-11

780115-11

780115-12

779627-02

779627-03

779627-01

779627-04

779627-06

779627-07

779694-06

779694-01

779694-02

779694-04

779694-03

779694-07

194929-03

780115-06

779694-09

779694-10

780115-10

779627-09

780115-09

779627-10

780115-01

780115-02

780115-07

780115-03

780115-04

16 AI (16-Bit, 1.25 MS/s), 2 AO (2.86 MS/s), 24 DIO USB Multifunction I/O Device

Overview

The USB-6251 offers analog I/O, digital I/O, two 32-bit counters/timers, 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 simplifies configuration and measurements.

Part Numbers (31) Price	779627-11	779627-12	779694-12	779694-11	780115-11	780115-12	779627-02	779627-03	779627-01	779627-04	779627-06	779627-07	779694-06	779694-01	779694-02	779694-04	779694-03	779694-07	194929-03	780115-06	779694-09	779694-10	780115-10	779627-09	780115-09	779627-10	780115-01	780115-02	780115-07	780115-03	780115-04

	Contact us	Contact us	Recommended replacement: 789888-01	Contact us	Contact us	Contact us	Contact us	Recommended replacement: 789888-01	Recommended replacement: 789888-01	Recommended replacement: 789888-01	Recommended replacement: 789888-01	Recommended replacement: 789888-01	Contact us	Recommended replacement: 789888-01	Contact us	Recommended replacement: 789888-01	Contact us	Recommended replacement: 789888-01	Recommended replacement: 789889-01	Contact us	Recommended replacement: 789888-01	Recommended replacement: 789888-01	Recommended replacement: 789888-01	Contact us	Recommended replacement: 789888-01	Recommended replacement: 789888-01	Recommended replacement: 789888-01	Recommended replacement: 789888-01	Contact us	Contact us	Recommended replacement: 789888-01
NI Lead Time	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks	16-17 weeks
Number of Bidirectional Digital Channels	—	—	—	—	—	—	24	24	24	24	24	24	24	24	24	24	24	24	—	24	24	24	24	24	24	24	24	24	24	24	24
Supported Power Input	—	—	—	—	—	—	Swiss 220VAC	Australia 240VAC	United States 120VAC	Universal Euro 240VAC	United Kingdom 240VAC	Japan 100VAC	United Kingdom 240VAC	United States 120VAC	Swiss 220VAC	Universal Euro 240VAC	Australia 240VAC	Japan 100VAC	—	United Kingdom 240VAC	Korea 220VAC	China 220VAC	China 220VAC	Korea 220VAC	Korea 220VAC	China 220VAC	United States 120VAC	Swiss 220VAC	Japan 100VAC	Australia 240VAC	Universal Euro 240VAC
Maximum Number of Single-Ended Analog Input Channels	—	—	—	—	—	—	16	16	16	16	16	16	16	16	16	16	16	16	—	16	16	16	16	16	16	16	16	16	16	16	16
Number of Counters/Timers	—	—	—	—	—	—	2	2	2	2	2	2	2	2	2	2	2	2	—	2	2	2	2	2	2	2	2	2	2	2	2
Maximum Number of Differential Analog Input Channels	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Analog Input Absolute Accuracy	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1920 μV	1920 μV	1920 μV	1920 μV	1920 μV	1920 μV	—	—	—	—	—

USB-6251 Accessories and Software

Software (2)

Product (Part Number) Description	Recommended use cases
FlexLogger Professional (785748-3501) FlexLogger Professional, Subscription License, Download	Recommended for automated, extensible data logging with NI data acquisition (DAQ) hardware. Automate tests using alarms, triggers, and events, and expand capabilities with plug-ins. Key Features Multichassis synchronization—Synchronize multiple NI chassis for accurate, time-aligned measurements across high channel counts. Logging triggers—Start, stop, or segment data recording automatically based on sensor thresholds or other conditions to capture only what matters. Events—Respond to specific occurrences during a test, such as activating equipment when a condition is met (for example, start cooling fans when temperature exceeds a limit). Automation APIs—Control and monitor FlexLogger from external applications (Python, NI LabVIEW, or NI TestStand), enabling integration into larger automated test systems. Calculation channels—Perform real-time math on acquired data (averages, RMS, custom formulas) to track derived measurements as the test runs. Plug-ins—Extend FlexLogger with custom LabVIEW or Python plug-ins to integrate third-party hardware, perform custom analysis, or connect to lab systems. CAN/LIN logging—Acquire and log automotive network data alongside sensor measurements for complete vehicle or subsystem testing.	View Product Details
LabVIEW+ Suite (788509-35) NI LabVIEW+ Suite, Subscription License, Download	Recommended for engineers building full test and validation systems where modular code development and higher-level frameworks are needed to accelerate development for shorter time to market. The LabVIEW+ Suite includes the following products: NI LabVIEW—Provides a graphical programming environment for test system development, enabling connectivity to any instrument and fully integrated user interfaces. NI TestStand—Eliminates the need for time-intensive in-house sequencer development and maintenance by providing an off-the-shelf test management software for validation and production test. NI DIAdem—Saves engineers hundreds of hours of manual data analysis and report creation with automation. NI FlexLogger™ software—Simplifies data acquisition and data logging with interactive measurement setup for NI DAQ hardware. NI InstrumentStudio™ software—Provides a central location for configuration, measurement, and automation.	View Product Details