# Keysight U2355A 64-Channel 250 kSa/s USB Modular Multifunction DAQ # Keysight U2355A 64-Channel 250 kSa/s USB Modular Multifunction DAQ ## Key Features At A Glance - Hi-Speed USB 2.0 with USBTMC-USB488; SCPI and IVI-COM programmable interfaces for automated test systems - Functions as a standalone or modular unit — up to 384 channels in the U2781A modular product chassis - Sampling rates from 250 kSa/s up to 3 MSa/s single-channel across the series - 12-bit or 16-bit analog-to-digital resolution, no missing codes, depending on model - 24-bit programmable digital I/O plus two independent up/down counters - Self-calibration capability referenced to an on-board 5 V source - Available with or without analog output; AO models generate sine, square, triangle, sawtooth, and noise waveforms - Includes Keysight BenchVue software for setup, data logging, and measurement visualization - Plug-and-play and hot-swappable USB connection The Keysight U2300A Series USB Modular Multifunction Data Acquisition (DAQ) devices are a high-performance PC data-acquisition solution. The series spans two families: a basic multifunction DAQ comprising four models, and a high density multifunction DAQ comprising three models. Each device combines analog input, digital I/O, counter, and — on selected models — analog output functions in a single USB-connected module. Across the series, these DAQ devices are applied in industrial and education environments. With their fast sampling rates, they are well suited to research and development, manufacturing, and design validation work. A data acquisition device of this type captures real-world analog and digital signals and routes them to a PC, where measurement data can be logged, visualized, and analyzed. ValueTronics stocks and holds its own inventory in a 20,000-square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Holding inventory directly means the U2300A Series module you order is on our own shelves, ready to ship. ## Brand Heritage Keysight Technologies traces its roots to Hewlett-Packard's test and measurement business, which was spun off as Agilent Technologies in 1999 and then established as Keysight Technologies in 2014. Instruments in this series carry that measurement heritage forward under the Keysight name. ## Compare Other Models in This Series The U2300A Series is organized into two families. The basic multifunction USB DAQ family consists of four models — U2351A, U2352A, U2353A, and U2354A — offering 16 single-ended / 8 differential analog input channels. The high density multifunction USB DAQ family consists of three models — U2355A, U2356A, and U2331A — offering 64 single-ended / 32 differential channels. All models share Hi-Speed USB 2.0 connectivity, 24-bit programmable digital I/O, two independent counters, and SCPI/IVI-COM programmability. Within each family the models differ chiefly in maximum sampling rate and, in the high density family, in analog-to-digital resolution. Two of the basic models are offered without analog output, while the others add two analog output channels with predefined waveform generation. Each model below is its own dedicated product page with condition-matched pricing for new units. Select the specific model that matches your channel-count and sampling-rate requirements to view its availability and current pricing. The basic multifunction models divide by sampling rate: the U2351A and U2352A provide 250 kSa/s, while the U2353A and U2354A provide 500 kSa/s. Within each pair, the U2352A and U2354A are supplied without analog output, whereas the U2351A and U2353A include two 16-bit analog output channels. All four use 16-bit analog input resolution with no missing codes. In the high density family, the U2355A samples at 250 kSa/s and the U2356A at 500 kSa/s, both at 16-bit resolution, while the U2331A samples up to 3 MSa/s on a single channel (1 MSa/s across multiple channels) at 12-bit resolution and adds extended bipolar and unipolar input ranges. The comparison table below details the channel counts, sampling rates, resolution, and analog output configuration for each model. Model Analog Input Channels Max Sampling Rate ADC Resolution **U2355A** 64 SE / 32 DI 250 kSa/s 16 bits U2351A 16 SE / 8 DI 250 kSa/s 16 bits U2352A 16 SE / 8 DI 250 kSa/s 16 bits U2353A 16 SE / 8 DI 500 kSa/s 16 bits Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Accessories Supplied - AC/DC Power adapter - Power cord - USB extension cable - L-Mount kit (used with modular product chassis) - Keysight USB Modular Products Quick Start Guide - Certificate of Calibration ## Product Core & Specifications Specification Value Analog Input Resolution 16 bits, no missing codes Number of channels 64 SE/32 DI (software selectable/channel) Maximum sampling rate 250 kSa/s Scan list memory Up to 100 selectable channel entries Programmable bipolar input range ±10 V, ±5 V, ±2.5 V, ±1.25 V Programmable unipolar input range 0 to 10 V, 0 to 5 V, 0 to 2.5 V, 0 to 1.25 V Input coupling DC Input impedance 1 GΩ / 100 pF Operational common mode voltage range ±7.5 V maximum Overvoltage protection Power-on: Continuous ±30 V; Power-off: Continuous ±15 V Trigger sources External analog/digital trigger, SSI/Star trigger Trigger modes Pre-trigger, delay-trigger, post-trigger, and middle-trigger FIFO buffer size Up to 8 MSa Analog Input Measurement (23 °C ± 5 °C) Offset error ±1 mV Gain error ±2 mV –3 dB small signal bandwidth 760 kHz 1% THD large signal bandwidth 400 kHz System noise 1 mVrms CMRR 64 dB Spurious-Free Dynamic Range (SFDR) 88 dB Signal-to-Noise and Distortion Ratio (SINAD) 80 dB Total Harmonic Distortion (THD) –90 dB Signal-to-Noise Ratio (SNR) 80 dB Effective Number of Bits (ENOB) 13 Analog Input DC Accuracy — Unipolar (typical at 23 °C) 10 V range 0.03% + 1.0 mV (offset 1.0 mV, gain 1.5 mV) 5 V range 0.06% + 1.0 mV (offset 1.0 mV, gain 1.5 mV) 2.5 V range 0.08% + 1.0 mV (offset 1.0 mV, gain 1.0 mV) 1.25 V range 0.16% + 1.0 mV (offset 1.0 mV, gain 1.0 mV) Analog Input DC Accuracy — Bipolar (typical at 23 °C) 10 V range 0.02% + 1.0 mV (offset 1.0 mV, gain 2.0 mV) 5 V range 0.04% + 1.0 mV (offset 1.0 mV, gain 2.0 mV) 2.5 V range 0.06% + 1.0 mV (offset 1.0 mV, gain 1.5 mV) 1.25 V range 0.12% + 1.0 mV (offset 1.0 mV, gain 1.5 mV) Analog Output Resolution 12 bits Number of channels 2 Maximum update rate 1 MSa/s Output ranges 0 to 10 V, ±10 V, 0 to AO\_EXT\_REF, ±AO\_EXT\_REF Output coupling DC Output impedance 0.1 Ω typical Stability Any passive load up to 1500 pF Power-on state 0 V steady state Trigger sources External analog/digital trigger, SSI/Star trigger Trigger modes Post-trigger and delay-trigger FIFO buffer size One channel: Maximum 8 MSa; Two channels: Maximum 4 MSa/ch Function generation mode Sine, square, triangle, sawtooth, and noise waveforms Analog Output Measurement (23 °C ± 5 °C) Offset error ±1 mV Gain error ±4 mV Slew rate 19 V/μs Rise time 0.9 μs Fall time 0.9 μs Settling time to 1% output error 4 μs Driving capability 5 mA Glitch energy 5 ns-V (typical), 80 ns-V (maximum) Analog Output DC Accuracy (typical at 23 °C) Unipolar 10 V range 0.02% + 1.0 mV (offset 1.0 mV, gain 2.0 mV) Bipolar 10 V range 0.04% + 1.0 mV (offset 1.0 mV, gain 4.0 mV) Calibration Stability ± 6 ppm/1000 hrs > **Important:** Hi-Speed USB 2.0 / USBTMC-USB488 operation is compatible with Microsoft Windows operating systems only and requires a direct USB connection to the PC so the appropriate driver can be installed. > **Important:** A 20-minute warm-up time is recommended before taking measurements; the stated specifications are for 20 minutes of warm-up time and self-calibration. > **Important:** Signal-connection terminal blocks (U2901A or U2902A — terminal block with SCSI-II 68-pin connector and 1-meter/2-meter cable) are listed as optional accessories and are not part of the standard shipped accessories. > **Important:** The U2802A thermocouple input device is designed for use with the U2355A/U2356A DAQ in standalone operation only (not in modular chassis configuration). > Recommended pairing: for temperature measurements with thermocouples, the U2802A 31-Channel Thermocouple Input Signal Conditioner is designed for use with the U2355A/U2356A modules. ## About this New unit This is a brand-new, factory-sealed unit, supplied exactly as it arrives from the manufacturer and backed by the full manufacturer warranty. For the exact configuration, available options, included accessories, or current lead time for your application, our Test Architects can confirm the details before you order. ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application. **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 2867.0 USD - **Vendor:** Keysight Technologies - **Type:** Data Log - **Tags:** product_manual_group_3 ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 2867.00 USD | In stock | ## Images - Keysight U2355A 64-Channel 250 kSa/s USB Modular Multifunction DAQ --- > Source: [ValueTronics](https://valuetronics.com/products/u2355a-keysight-data-logger-new) > Updated: 2026-06-20