Extract text from data log files (DL4)
To convert DL4 data logs to another format, you need Advantest TestFlow or other Data software.
To convert other file formats to the "Hardware Log File" file type, you need software like Advantest TestFlow or a similar tool.
A .dl4 file is a specialized data log container used in industrial and engineering environments. It is not a single universal format but rather a file extension shared by three distinct hardware ecosystems: Advantest semiconductor test systems, McElroy pipe fusion machines, and Woodward engine calibration tools.
For Advantest users, the file contains ATE (Automated Test Equipment) results from TestFlow systems, logging pass/fail data for semiconductor components. These files are often binary and large, making them impossible to open in standard text editors.
For McElroy users, the .dl4 file represents a "fusion joint report" generated by the DataLogger 4 (DL4) tablet. These files are critical for construction compliance, recording temperature, pressure, and drag data during pipe welding. Users typically struggle because they need to turn these raw logs into professional PDF reports for inspectors or CSV files for auditing.
For Woodward MotoTune users, the file stores ECU (Engine Control Unit) sensor data used for tuning vehicle performance.
The primary friction for all .dl4 users is the proprietary lock-in. You typically cannot double-click these files to view them without the specific vendor software installed. To make the data usable for analysis or reporting, the best workflow is to convert them to CSV or XLSX for Microsoft Excel or PDF for non-editable archiving.
Convert.Guru analyzes your DL4 file, detects the exact format, and lets you read the text inside.
Users also converted TTP, KDT and SLC files.
If you want to convert DL4 file to , you can use Advantest TestFlow or similar software from the "Industrial Data Logging" category. In the File menu, look for Save As… or Export….
To convert files to DL4, try Advantest TestFlow or another comparable tool in the "Industrial Data Logging" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our DL4 converter.