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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

• Supports Peak and Average power sensor model U2044XA
• Dual TDR/DTF window in CAT mode
• Various bugs fixes for ERTA and Option 330
• Fixed TDR (ohm) file saving for .CSV and .S1P
• Bug fixes in NA mode. Averaging reset did not happen after measurement changed.
• Bug fixes for Invalid Connector ID error during Enhanced Resopnse Cal with certain calibration kits


• Adds support for ERTA (Option 209) and TDR (Option 215). Requires firmware A.08.00 or above.
• Adds support for ECal with option 020
• 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
2015-08-21 A.08.06 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.
  • Some earlier units (typically N9912A and N9923A) may run out of internal storage space to unpack the firmware. Please delete all internal user saved files and then proceed with the update.
  • See A.07.xx/A.08.xx firmware update supporting documentation for installation process.


  • Does Not Require a License

Supporting Documentation


Installs on:



  • Information Not Available

Supported Instruments

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