WT300E Digital Power Meter


This firmware is intended to upgrade the WT300E to the latest version.


Please read installation manual (IM B8212ZY-02EN) throughout before performing the installation.
Each zip file contains firmware program file and an installation manual.

Revision History

Version Release Date Content
1.04 Nov 26,2018
  • Support additional suffix code for power cords corresponding to Taiwanese RoHS.
1.03 Jun 8,2018
  • Changes with replacement parts.
1.02 Nov 4,2016
  • Fixed the problem that the WT300E with the Ethernet I/F option (/C7) sometimes hung after operating for one and a half months continuously.
  • Fixed the problem that when the over current protection function went into action during auto range integration on the WT310E, sometimes a measurement value after that was not updated.



Please read Software Agreement carefully before downloading.


Version 1.04
Release Date Jun 30, 2020
File Name WT300E_104.zip 2.5 MB


Type Firmware* 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.

Related Products & Solutions

WT300E - Economy

  • Standby Power Measurements, Energy Star®, SPEC Power® and IEC62301/EN50564
  • Evaluation and Testing of Batteries, Home Appliances and Uninterruptible Power Supplies (UPS)