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KEW 6305 Firmware、KEW Windows for KEW 6305

Jan. 16, 2026 updated

Applicable model

  • KEW 6305

CAUTION

Both the Firmware and KEW Windows for KEW 6305 are required to upgrade to the updated version in order that your KEW 6305 works normally.
*Version can be checked here.

The latest version as of 16 January 2026

  • Firmware: Ver 3.10 / 4.00 /5.00 (Jan. 16, 2026 updated) 
    *Available latest version varies depending on the firmware version of the product that you own.
  • KEW Windows for KEW 6305: Ver 1.60 (Dec. 14, 2022 updated)

Please click here to see the history of version upgrade.

Firmware

*Available latest version varies depending on the firmware version of the product that you own. Click here how to check the firmware version. 
*If nothing appears during the firmware upgrade process, press the ESC switch.

For products with firmware V5.00:

Operating System Version File
- V5.00 V5.0 is the latest firmware.

For products with firmware V4.00:

Operating System Version File
- V4.00 V4.0 is the latest firmware.

For products with firmware V3.xx:

We ask you to register the serial number of your 6305 in order to install the software for the firmware.
* Serial number can be checked here.

How to install:

Please input the serial number of your 6305, and click "Next".
Note:Please use letters in capital.
*For the product with firmware V4.00 or later, please do not install the following firmware. It may cause malfunction. 

Serial No.

Operating System

 Version File
- V3.10

KEW Windows for KEW 6305

CAUTION

  • When updating the application which has been already installed in your PC, please uninstall the existing "KEW Windows for KEW 6305" via Add/Remove Programs on Control panel prior to updating the application.

How to install:

  1. Click the , it will be automatically download to the folder you chose.
  2. Double-click the saved file. Installation starts after the file is unzipped. Follow the instruction displayed.

Operating System

 Version File Language
Windows 11 V1.60 [English]
[French]
[Netherlands]

〈System Requirements〉
　OS:Windows 11　Display:XGA(1024×768),65536 colors or more
　Required HDD space:1Gbyte or later　Others:USB port, .NET Framework(4.6.1 or later)

USB Device Driver

How to install:

    1. Click the and specify the folder to save. The file will be automatically download to the specified folder.
    2. Double-click the saved file. The file is unzipped and the installation starts. Follow the instructions displayed on the screen.

Operating System

 Version File
Windows 11 -

How to check the version of your KEW 6305

Firmware

  1. KEW 6305 gets started when rotating and setting the Function switch to any position other than"OFF"Then, the start-up screen will be displayed.
  2. The part circled in red at the figure is the information for the version.

KEW Windows for KEW 6305

  1. Operate the KEW Windows for KEW 6305.
  2. The part circled in red at the figure is the information for the version.

How to check the serial number

  1. Please see the rear of your KEW 6305 unit.
    The number circled in red in the right picture is the serial number.
  2. Please input this number.

Version history

Firmware 

*Three different upgrade versions are available because multiple hardware configurations exist. Firmware version can be checked on your KEW 6305.

For products with firmware V5.00:
Version Date Remark
5.00 Dec.2025
  • Measurement performance at Three-phase 3-Wire has been improved.
For products with firmware V4.00:
Version Date Remark
4.00 Aug.2025
  • Update associated with components changes.
    *Upgrading to V5.xx or later is not supported.
For products with firmware V3.xx:
Version Date Remark
3.10 Aug.2025
  • Update associated with components changes.
    *Upgrading to V4.xx or later is not supported.
3.00 Apr.2024
  • Update associated with components changes.

2.10

 Mar.2023
  • -

2.01

 Jul.2022
  • Displayed reactive power value is one-hundredth of the actual value.

2.00

 Sep.2021
  • Supports Bluetooth5.0.
  • Supports KEW 8135 Flexible Clamp Sensor.
1.11 Feb.2019
  • Problem that calculated active power values suddenly changes to 0 has been solved.
1.10 Feb.2018
  • Supports new flexible clamp sensor KEW8133.
  • Defect fixed that causes high power factor (>1) indication at 3P3W measurements.
1.09 Sep.2015
  • Modified for easier and faster loading of settings (SETUP24).
  • Model names of 8124 and 8130 will be displayed in turn while Clamp sensor 8124 has been selected through SETUP3 (Clamp sensor settings) or SETUP27 (Auto-setting for V/A range).
1.08 Oct.2014
  • -
1.07 Apr.2014

The following problems are solved:

  •  Showing wrong time at TIME (SETUP07) setting.
  •  Sometimes not recording data. (on Time Period recording mode)
1.06 Mar.2014
  • Problems with data saving on SD card are fixed.
1.05 Sep.2013

The following problems are solved:

  • Sometimes, an error message "no.dAtA" is displayed if the function is changed to "Data check" during integration measurement.
  • Display error during wring check.
1.04 Jul.2013
  • The problem that values of active power [P] are not displayed properly, when using Data check function and showing the data measured under the wiring configuration "1P2Wx1", is solved.
1.03 Jan.2013
  • Update associated with components changes.
1.02 Oct.2012
  • Problem in Wh and Demand measurement is solved.
    (When it measures for more than 25 days, Date & Time in saved data cannot save correctly.)
1.01 May.2012
  • Fixed a bug that does not match the date and start time and date of the save file is to start the measurement.
1.00 Apr.2012
  • Initial issue

KEW Windows for KEW 6305

Version Date Remark
1.60 Dec.2022
  • Support Windows 11.
  • Report output function problem is solved.
1.51 Sep.2021
  • Supports KEW 8135 Flexible Clamp Sensor.
  • Incorrect unit display at graphic viewer is solved.
1.50 Nov.2019
  • Selectable currency on report output function has been updated.
1.42 Oct.2018
  • Defects relating to summary report output are fixed.
  • Incorrect language display of measured item name is fixed.
1.41 Mar.2018
  • Manual for KEW6305 is updated.
1.40 Feb.2018
  • Supports new flexible clamp sensor KEW8133.
  • Fixed a failure problem that avg., max., and min. values on summary report aren’t output for the data recorded at 1 sec. interval.
1.30 Nov.2016
  • Numeric display of default setting has been replaced with actual number display.
1.20 Nov.2016
  • Added French and Dutch language support.
1.10 Apr.2016
  • Model name of clamp sensor is updated from 8124 to 8124/8130.
  • Display problem – showing incorrect integrated value at report output – is fixed.
1.06 Feb.2016
  • Model name of clamp sensor is updated from 8124 to 8124/8130.
  • Display problem – showing incorrect integrated value at report output – is fixed.
1.05 Aug.2014
  • Failure to defect the connected device, under specific conditions, from the top menu is solved.
1.04 Dec.2013
  • Driver is updated to support Windows 8(32/64bit)
  • The following problems are solved.
    * Changes to the report intervals cause display errors.
    * Graphs are not displayed, if measurements were performed under no inputs.
  • Can use this application if the user is different from who installed it.
1.03 Sep.2012
  • The display style of the list displayed at the Data Analysis was changed into standard format from index form.
  • In some language regions, the analysis function corrected the fault which does not operate normally.
1.02 Jul.2012
  • Adding the functionality of the total of individual measurement data.
  • Fixed a bug graph is not displayed correctly in Windows XP.
1.01 Mar.2012
  • Add a manual of KEW6305.
1.00 Apr.2012
  • Initial issue