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Model DI-155 - OBSOLETE(Please consider DI-2108P)

Four-channel ±50V USB Data Acquisition Starter Kit

Out of


  • Includes a DI-155 instrument, a 6-foot USB cable, a screwdriver for signal connections, and downloadable WinDaq software
  • Direct replacement for the DI-158 data acquisition start kit (compare)
  • Low-cost, Compact USB Data Acquisition Starter Kit
  • Four Differential Analog Inputs
  • ±2.5 to ±50 V programmable full scale range per channel
  • 13-bit Resolution
  • Up to 10 kHz Sample Rate
  • Unlock code required for sample rates over 240 Hz only when using WinDaq software
  • 4 Digital Inputs including counter and frequency inputs
  • 4 High Voltage Digital Outputs
  • Provided with WinDaq Software
  • CE Approved
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DI-155 Data Acquisition Starter Kit
This data logger is manufactured in the United States of America


The new DI-155 is a full-featured data acquisition system at a starter kit price that will change the way you measure price and performance. It combines analog input and digital I/O flexibility to yield a nearly indestructible solution for tough industrial measurements. Four armored differential analog inputs measure from ±2.5 to ±50 volts full scale across eight independently programmable ranges per channel. Their armored design allows them to tolerate transient over-voltages to ±150 VDC or peak AC, so the DI-155 absorbs abuse and bounces back for more. And the DI-155’s 13-bit ADC operates at a maximum throughput rate of 10 kHz, so you won’t miss any signal activity that might blow past more costly but less capable instruments.

Then there’s the digital I/O. Each of the DI-155’s four digital input bits will tolerate up to ±30 V without damage. Use them as four discrete inputs, or program one for a counter and another as a timer for frequency, RPM, or cycle count measurements. And each of the DI-155’s digital outputs can switch loads as great as 30 volts and can sink as much as 500 mA.

The DI-155 is powered directly from the connected computer’s USB port, so you don’t have to wrestle with external power supplies. And it’s provided with our powerful WinDaq software for Windows that allows a real time display of any combination of analog and digital channels, and the ability to stream acquired data to disk in recorder-like fashion. Two of the DI-155’s digital inputs may be used for remote stop/start and remote event operations using WinDaq software. WinDaq also includes software to review recorded data files, including waveform analysis and data file export to Microsoft Excel and other applications.



DI-155 High Speed Unlock Code

WinDaq Unlock Code


Unlocks WinDaq to allow recording speeds up to 10 kHz throughput. Unlock Code ONLY. No CD will be shipped. Please Note: If you are ordering this software for a device you already own, you MUST provide the serial number of your device under "Order Notes" during checkout to receive the unlock code. Please allow one (1) business day for processing.


4-20mA Current Loop Shunt Resistor

$ 2.99
R250 Shunt Resistor


250 Ω ±0.1% Precision, Metal Film, 1/2W, Axial Resistor
Exceptionally low noise; typically 0.10 μV/V
Low voltage coefficient to ±5 ppm/V
Flame retardant coating. RoHS compliant. Learn More


USB Ferrite Choke

Ferrite Choke


Ferrite choke reduces interference for USB-based data acquisition products.



Data Acquisition Recording and Playback Software

Included FREE with your Dataq Instruments hardware purchase. 240Hz maximum sample rate. For higher rates purchase the unlock code under the Accessories tab.

WinDaq Data Acquisition Software


Solutions for .NET Programming Environments

FREE .Net control communicates directly with your DATAQ Instruments device using any .Net programming language. Detailed sample programs included. Fully documented help file. Requires .NET Version 4



Drivers only Download

Installs drivers for all contemporary data acquisition hardware products that support WinDaq software.

Starter Kit Drivers


WinDaq-to-Excel Real Time Link

Real-time data logging directly to Microsoft Excel (supports MS Office 2003 or higher). No programming required. Free Trial Version. Purchase full version on WinDaq/XL product page.

WinDaq Data Acquisition Software

MATLAB Example Program

Program in Protocol Level

Learn how to program with MATLAB® in protocol level. Does not require MathWorks' Data Acquisition Toolbox.



Introduction to the DI-155 USB Data Acquisition Starter Kit
Overview of the DI-155

Introducing the DATAQ Instruments DI-155 USB Data Acquisition Starter Kit
How to Use the DATAQ Instruments DI-149 Rate Channel
Rate Channel

Learn how to Use the DI-149/DI-155 Rate Channel to Acquire Frequency Data
How to Use the DATAQ Instruments DI-149 Counter Channel
Counter Channel

Learn how to Use the DATAQ Instruments DI-149/DI-155 Counter Channel
Exporting Data to Excel
Export data to Excel

Learn how to export data from WinDaq Waveform Browser to Microsoft Excel.
Introduction to WinDaq Data Acquisition Software
WinDaq Data Acquisition Software

Introduction to WinDaq Data Acquisition Software.