Harmonic/Flicker Measurement Software for the WT5000 Precision Power Analyzer


This free version of harmonic/flicker measurement software*1*2 allows you to load data measured by the WT5000 onto a PC and perform harmonic measurements conforming to IEC61000-3-2 Ed 4.0. The WT5000 supports the 50/60 Hz (10/12 cycles) of interharmonic measurement required by IEC61000-4-7 Ed 2.0 Am1.

Support of the IEC 61000-4-15 Ed1.1 /Ed2.0.
The flicker meter standard that defines the requirements of the measurement equipment and test method of voltage fluctuation and flicker measurement.

Support of the IEC61000-3-3 Ed2.0 and Ed3.0
The measurement and judgment procedure of the Voltage fluctuation and Flicker requires above international standards as well.

If large current (larger than 16A/phase) equipment test is required, please contact us including current sensors.

*1 This software supports the following standards:

  • Harmonic
    • IEC 61000-3-2: Ed3.0 (2005), Ed3.0 A2 (2009), Ed4.0 (2014)
    • EN61000-3-2: 2006, 2009, 2014
    • IEC 61000-3-12: Ed1.0 (2004), Ed2.0 (2011)
    • EN 61000-3-12: 2005, 2011
    • IEC 61000-4-7: Ed1.0 (1991), Ed2.0 (2002), Ed2.0 A1 (2008)
    • EN 61000-4-7: 1993, 2002, 2009
    • JIS C61000-3-2: 2011
    • JIS C61000-4-7: 2007
  • Voltage fluctuation/flicker
    • IEC 61000-3-3: Ed2.0 (2008), Ed3.0 (2013)
    • EN 61000-3-3: 2008, 2013
    • IEC 61000-3-11: Ed 1.0 (2000)
    • EN 61000-3-11: 2000
    • IEC 61000-4-15: Ed1.1 (2003), Ed2.0 (2010)
    • EN 61000-4-15: 1998, 2003, 2011

      For support for newer standards than the above, please purchase the product version that will be released soon.

*2 This version provides NF Corporation’s power supply control functions free of charge.


How to install the software

  1. Decompress the downloaded file. The harm661s1_f folder will be created.
  2. Double click the Installer.exe to start the installer.
  3. Follow the on-screen instructions to proceed with the installation.
  4. Accept the default destination directory.
  5. After the installation is complete, start the application by selecting:
    Start > Programs > Yokogawa > IEC61000 for WT5000




Please read Software Agreement carefully before downloading.


Version 6.61 S1
Release Date Mar 24, 2020
File Name harm661s1_f.zip 293 MB


Type Software* Registration is required to download.

How to Evaluate Flicker

How is Flicker Measured? Flicker is present in most electric lighting, sometimes visible, and sometimes non-visible. There are two types of flicker measurements- long-term or PLT and short-term or PST, which is measured every 10 minutes. Flicker is measured in perceptibility units, flicker index, percent flicker, and flicker frequency.

* Software Agreement
  • The property rights, proprietary rights, intellectual property rights, and all other rights associated with the software are held by Yokogawa Test & Measurement 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.
  • Note that you must agree to the contents of “Software License” for the software that encloses or displays the “Software License” as the conditions of use.
  • This software product may contain open source software (hereafter referred to as OSS). License terms appropriate for each OSS component are applicable in place of the terms of this license. If there is a discrepancy between the terms of the OSS license and the terms of this license, the license terms of the corresponding OSS take precedence.

Downloading of the software indicates acceptance of the software agreement.

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IEC61000-3-2, IEC61000-3-12, IEC61000-3-3, IEC61000-3-11 Harmonic and Flicker Compliance Software

WT5000 - Precision Power Analyzer

  • Precision power analyzer with superior accuracy
  • 7 swappable input elements
  • 4 motor inputs
  • Harmonics test compliant to IEC 61000-3-2