DL850/DL850V WDF File Access Library


These software (DL850.dll) offers API (Application Program Interface) for acquiring data from waveform data files (WDF) saved on DL850/DL850V .

Applicable Model

DL850V, DL850
Applicable DL850/DL850V firmware version is 3.00 or earlier.


This software enables the following functions.

  • Getting Measuring Date/Time
  • Getting Measuring Trace(Channel) Information
  • Getting Measuring Points
  • Getting Time Data/Measuring Data
  • Getting Units of Time Axis/Measuring Axis
  • Getting Resolutions of Time Axis/Measuring AxisViewer

Software Structure

This software is composed of the following software packages.

  • DL850 series WDF File Access Library User’s Manual
  • API Related files
    File Name   Content
    DL850.dll : DL850/DL850V WDF File Access Library Body (32-bit/64-bit)
    DL850.lib : DLL Import Library for DL850.dll (32-bit/64-bit)
    DL850APIPublic.h : Header file of Prototype Declaration
    DL850APIWrapper.{cpp,h} : Sample Code by Explicit DLL Linking

System Condition

Operating System
Windows 7 and Windows 8

Core2Duo 2GHz or faster

At least 2GB

Application Developing Environment
Visual C++8.0 or later
(When using in another environment of Viaual C++ 2008, you need re-distribution package of Visual C++ 2008.)

Revision History

Version Date
Ver (Applicable DL850/DL850V firmware version is 3.00 or earlier. ) Oct 14, 2014
Ver (Applicable DL850/DL850V firmware version is 3.00 or earlier. ) Mar 1,2014
Ver Jan 31,2013
Ver Apr 15,2011


  • Applicable DL850/DL850V firmware version is 3.00 or earlier.
  • This software is the special library for waveform data files saved on DL850/DL850V.
    Please do not use for waveform data files saved on other measuring instruments.
  • Please check the version of the software and DL850/DL850V firmware prior to use.
    The corresponding versions are being indicated in the "readme.txt" which is extracted from the downloaded .zip file.

Here is available for a later firmware version.



Please read Software Agreement carefully before downloading.


Release Date Oct 14, 2014
File Name DL850_WDFAPI_v2108.zip 2.2 MB


Type Software * Registration is required to download.


* Software Agreement
  • The property rights, proprietary rights, intellectual property rights, and all other rights associated with the software are held by Yokogawa Electric Corporation.
  • Under no circumstances is any dumping, reverse compiling, reverse assembly, reverse engineering, or any other kind of alteration or revision of this software allowed.
  • This software is offered free of charge, but no unlimited warranties are made against any defects whatsoever.
  • Also, Yokogawa may not be able to accept inquiries regarding repair of defects in or questions about this software.
  • The contents of this software are subject to change without prior notice as a result of continuing improvements to the software\'s performance and functions.
  • Yokogawa bears no liability for any problems that may occur during download or installation of this software.
  • Use of the Yokogawa Web site is at the user\'s own risk.
  • Any parties contributing to the creation or distribution of the contents on the Yokogawa Web site shall bear no responsibility whatsoever for any damages occurring as a result of the use of said contents.

Downloading of the software indicates acceptance of the software agreement.

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