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FieldFox Analyzer Current Firmware (all FieldFox models)

To upgrade firmware:

  1. Power on the FieldFox
  2. To view the current installed firmware in FieldFox
    • Press System (7), press Service Diagnostics, press System Information
  3. The Current Version tab at the bottom of this page provides a link to download the latest firmware
  4. Follow the appropriate Update Instructions from the table below
Current Firmware Revision Updated Firmware Revision Update Instructions


(Supports all FieldFox models)

Back up all user state files before upgrading to firmware revision A.08.xx

• Fixes SWR resolution for Scale and Reference rounding.
• Adds support for ERTA (Option 209) and TDR (Option 215). Options 209 and 215 require firmware A.08.00 or above.
• Adds support for ECal with option 020
• Fixes prompts during calibration when user-created cal kits specifies a connector whose equivalency to a "standard" connector cannot be established.
• Adds DNS setting in LAN configuration setup.
• Adds support for local time adjustment via internet update (A.07.5x)
• ECal support on all models, except N9912A (A.07.26)
• Adds support for ECal with option 020 (Type-N connectors).
• Implementation of time/date restriction setting on FieldFox. Please set local time correctly before updating from previous revisions to A.07.xx.

Updating to / within A.07.xx or A.08.xx

Updating firmware using external USB CD-ROM/DVD-ROM drive


Supports DataLink 4.12
Supports all FieldFox models

Updating to / within A.06.xx
A.04.xx or A.05.xx

Latest release (A.05.53*)
* Only for N9912A and N9923A.  See "Previous Version" tab to download

Updating within A.04.xx or A.05.xx
< A.04.00

A.04.02 (US/SG serial numbers)
A.04.03 (MY serial numbers)
Refer to "Supporting Documentation" below

Updating A.02.xx or A.03.xx

NOTE: Firmware upgrades do not affect the measurement accuracy of a FieldFox instrument. An annual calibration of a FieldFox remains valid following a firmware upgrade


To downgrade firmware:

Click here to view significant firmware history changes

Release Date Version Version Description
2015-03-17 A.08.01 Zip file containing firmware files

How to Download

  • Click the download button, select file, save and unzip.

How to Install

  • NOTE!!! Please backup all user state files to computer or USB flash drive before updating to firmware revision A.07.7x/A.08.xx.
  • See A.07.xx/A.08.xx firmware update supporting documentation for installation process.


  • Does Not Require a License

Supporting Documentation


Installs on:



  • ***Before updating to firmware revision A.07.xx/A.08.xx, please MAKE SURE the time, date and time zone are set correctly. After installing this version, you will only be able to change your time once per day, and no more than 5 hours backwards.***

Supported Instruments

  • N9912A, N9923A, N9913A, N9914A, N9915A, N9916A, N9917A, N9918A, N9925A, N9926A, N9927A, N9928A, N9935A, N9936A, N9937A, N9938A