Here’s the page we think you wanted. See search results instead:

 

Contact an Expert

Maintaining the FieldFox in a Secured Environment

Overview

When the FieldFox is used in a secure environment, it is important to prevent inadvertent removal of confidential data from the secure environment. This web page describes the various types and uses of digital memory within the FieldFox instrument. The section below titled Maintaining Security describes a process for clearing all memory that may contain confidential information resulting from normal use of the instrument.

The information on this web page applies to the following model numbers:

  • N9912A, N9913A, N9914A, N9915A, N9916A, N9917A, N9918A, N9950A, N9951A, N9952A
  • N9923A, N9923AN, N9925A, N9926A, N9927A, N9928A
  • N9935A, N9936A, N9937A, N9938A, N9960A, N9961A, N9962A

Definition of "user accessible memory" for this web page:

User accessible memory is memory that stores information about measurements made by the FieldFox instrument, either directly or indirectly. Clearing all user accessible memory clears all history of measurements previously made by the FieldFox instrument.

Battery Information

The FieldFox contains two batteries.

The main battery provides operating power for the instrument. It is removable.

  • For N9912A, N9923A and N9923AN: The second battery powers the real time clock function. This battery is permanently installed on a printed circuit assembly, it is not removable.
  • For N9913A, N9914A, N9915A, N9916A, N9917A, N9918A, N9925A, N9926A, N9927A, N9928A, N9935A, N9936A, N9937A, N9938A N9950A, N9951A, N9952A, N9960A, N9961A, N9962A: The second battery powers the real time clock function. This battery is installed on a printed circuit assembly, it is removable.

Types of Memory

The FieldFox has several types of memory.

  • SOM board flash memory, 64 Mb. It is divided into three partitions: Keysight (42 Mb), FactoryData (2 Mb) and UserData (20 Mb). Only the UserData partition is accessible by the user. The other partitions are used for firmware storage, data from annual calibration, etc.
  • SOM board RAM, 128 Mb. This is volatile memory. All information is erased and unrecoverable when power is removed from the instrument, i.e. external power and the main battery are both removed.
  • System board flash memory, 4 GB microSD. Stores UserData and accessible by the user. Only applicable for FieldFox model N9913A, N9914A, N9915A, N9916A, N9917A, N9918A, N9925A, N9926A, N9927A, N9928A, N9935A, N9936A, N9937A, N9938A, N9950A, N9951A, N9952A, N9960A, N9961A, N9962A. UserData on internal flash (64 MB flash memory on SOM board) is not available when microSD flash memory is used.
  • System board System Monitor Microcontroller, 32 Kb flash memory and 1 Kb volatile memory. This memory is not user accessible.
  • RF board and System board ID EPROM's, 128 bytes of flash memory. Each PCA has an ID EPROM that stores PCA identification and revision information. This memory is not user accessible.
  • Front panel interface board Microcontroller, 16 Kb flash memory and 2 Kb volatile memory. This memory is not user accessible.
  • Main battery flash memory, 1 Kb. The main battery is "smart", it maintains information about battery usage and current condition. This memory is not user accessible. The main battery is removable. It may be replaced without impacting instrument operation.

Maintaining Security

The following process completely clears all user accessible memory on the FieldFox instrument. This process requires firmware revision A.03.02 or later.


Press the following keys:


System(7)
Service Diagnostics
Advanced
Erase User Data
Confirm Erase
Wait for the instrument to reboot and begin normal operation.

The process will completely erase the UserData flash memory partition and reboot the instrument. When the reboot is completed, the instrument will be ready for normal operation.
Remove the main battery and external power from the FieldFox instrument for at least two minutes. This will erase the volatile RAM on the SOM board.

Notes on the process for erasing the UserData flash memory partition

There are two basic types of files in the UserData partition. One type is "system" files that are required for normal operation of the firmware. When the firmware finds one or more of these "system" files missing at boot up, default versions of these "system" files are written into the partition. Some of these "system" files may be modified by the user. The second type of files result from actions by the user (saving traces, saving screen captures, saving state files, etc.).

When the UserData partition is cleared, all files are removed from the partition. When the instrument re-boots, the firmware writes default versions of "system" files that are missing. Thus, clearing the UserData partition does not permanently interfere with normal operation of the instrument.

There is no "full chip erase" function available on the memory chips used for the flash memory on the SOM board.

The lowest level erase available on the flash memory is the sector erase. A sector erase sets all bytes within a given sector to FF (all one's).

The Erase User Data function does the following:

Performs a sector erase on all sectors in the UserData partition.
Writes zeros into all bytes in the UserData partition.
Performs a sector erase on all sectors in the UserData partition.
The instrument is re-booted

More Information

Additional information for many Keysight products can be found on our Instrument Security Application Note. (pdf)