2558A AC Voltage Current Standard


This firmware is intended to upgrade the 2558A to the latest version.

Revision History

Version Release Date Contents
1.04 Feb 8, 2016
  • Added 8 seconds option to the sweep time.
1.03 Jul 2, 2014
  • Improved the initialize operation in communication.
1.02 Sep 10, 2013
  • Improved the synchronous function.



Please read Software Agreement carefully before downloading.


Version 1.04
Release Date Feb 8, 2016
File Name 2558A_104.zip 2.66 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

2558A AC Voltage Current Standard

An AC voltage and current standard is used as a trusted reference for the cost effective calibration of AC measuring instruments. The 2558A can be operated manually with intuitive front panel controls or programmatically via a remote computer interface.