The Keysight U2351A is a 16-channel USB modular multifunction DAQ device delivering analog input, analog output, digital I/O, and counter functionality in a compact, hot-swappable form factor. Connecting via USB 2.0 with USBTMC-USB488 support, it operates standalone or integrates into the U2781A chassis for expanded channel counts.
Technical Specifications
Analog Input
• 16 single-ended or 8 differential channels
• 16-bit A/D converter
• Sampling rate: Up to 250 kSa/s total; shared across active channels (e.g., 15.625 kSa/s per channel at 16 channels)
• Input ranges: 10 V, 5 V, 2.5 V, 1.25 V (unipolar)
• Accuracy: 0.04% of reading + 1.5 mV (10 V range); 0.08% of reading + 1.5 mV (5 V range); 0.08% of reading + 1.0 mV (2.5 V and 1.25 V ranges)
• Offset error: 1.0 mV to 1.5 mV
• Gain error: 1.0% to 2.0%
• Bandwidth: 400 kHz
Analog Output
• 2 channels
• 16-bit D/A converter
• Update rate: Up to 1 MSa/s
• Output voltage: 0 to 10 V and ±10 V
• Maximum output current: 5 mA per channel
• Supports predefined and arbitrary waveform generation
Digital I/O
• 24-bit programmable TTL channels
• Configurable as inputs or outputs for device control and closed-loop applications
Digital Counters
• 2 general-purpose channels
• 31-bit resolution
Memory & Acquisition
• On-board memory: 8M points
• Trigger sources: Immediate, analog/external digital, SSI/Star, Master/Slave
• Acquisition modes: Polling and continuous
– Key Features
• USB 2.0 connectivity with USBTMC-USB488 compliance
• Plug-and-play integration; hot-swappable design
• Modular expandability via U2781A chassis
• Flexible channel configuration for mixed-signal applications
– Typical Applications
• Data logging and signal measurement
• Waveform generation and arbitrary signal synthesis
• Digital control and TTL-level switching
• Frequency counting and event timing
– Compatibility & Integration
The U2351A functions as a standalone USB DAQ module or as part of a larger modular measurement system through the U2781A chassis, enabling scaled test setups without redesign.
