Keysight N9912A Service Guide 5-29
Theory of Operation
Firmware Related Information
Firmware Related Information
General Description
The analyzer is based on the Windows CE
1
operating system. This is a closed
system; no direct user access to the desktop of general operating system
functions is provided.
The file system for Windows CE is maintained in flash memory on the A6 SOM
board. There is limited access to the file system. Most memory is in protected
region and not directly accessible by the user.
The user accessible memory is under UserData. See the “File Management”
section of the FieldFox User’s Guide for instructions on saving, recalling, and
managing files in the unprotected memory.
User Accessible Files
— Directory structure below UserData in the A6 SOM board flash memory
(approximately 20 MB).
— External USB flash memory plugged in the analyzer.
— External SD memory card plugged into the analyzer.
NOTE: When copying files, a “Copy_....” directory is created at the root of the
destination device as the destination for the copied file(s). This characteristic
generally makes it impossible to copy a file into the desired directory under
UserData in the A6 SOM board flash memory. This limits the usefulness of
copying files to or within UserData.
Operational Files
— Results from adjustments performed under TME (see Chapter 3)—not
directly available to user.
— File resulting from CAT/NA user calibration—not directly available to user.
— Cal kit definition files—stored in UserData\calkits.
— Cable definition files—stored in UserData\Cables.
— Error log—not directly available to user. See “Error Log” further on in this
section for accessing error log information.
1. Windows“ and Windows CE“ are U.S. registered trademarks of Microsoft Corpora-
tion.
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