Secure Data, Option 7 4-4 Memory Profile and Security Issues
MS20xxC UG PN: 10580-00305 Rev. L 4-3
4-4 Memory Profile and Security Issues
This section describes the profiles of the various types of memory that are used in the
MS20xxC VNA Master and the associated security issues that are related to those memory
devices.
The MS20xxC has 1 GB of Flash non-volatile memory, has EEPROM memory, and has
sufficient DRAM volatile memory for normal operation. The instrument is supplied with a
USB memory device that plugs into the USB Type A connector. The MS20xxC does not have a
hard drive or any other type of volatile or non-volatile memory.
The following sections describe how memory is used in the VNA Master and how it can be
erased.
Internal Flash Memory
This memory space is used to store the instrument firmware and factory calibration, and can
be used to store measurements and setups that are saved by the user.
Saved measurements and setups that are stored in the Flash memory are all deleted by the
master reset process that is described in Section “MS20xxC Master Reset Instructions” on the
following page.
USB Memory Device
The USB memory device is not required for proper operation of the instrument. The
instrument may be directed to store measurements and setups directly to the USB memory
device, or you may transfer the contents of the internal flash memory into the USB memory
device for storage or data transfer purposes. The device is removable and therefore does not
pose a security risk because it can remain in a secured area, can be externally erased by a
computer, or can be destroyed.
RAM Memory
This is volatile memory that is used to store many parameters that are needed for the normal
operation of the MS20xxC along with current measurements. This memory is reset whenever
the instrument is restarted.
EEPROM
This memory holds information such as the model number, serial number, and calibration
data for the instrument. Also stored here are the operating parameters, such as frequency
range, that are set by the user. During the master reset process, all operating parameters
that are stored in the EEPROM are set to standard factory default values.
Note
With Option 7 enabled, the user is not able to store any measurements or setups to
this internal flash memory.
Note
With Option 7 enabled, the user does not have access to the internal flash memory
and, therefore, cannot transfer any contents of the internal flash memory into the
USB memory device.
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