Chapter 3 75
Basic Operation
Using Security Functions
Using Security Functions
CAUTION Do not use the following functions with signal generator firmware revisions C.04.84,
C.04.86, or C.04.95:
If you have one of the stated revisions installed, please upgrade immediately to firmware
revision C.04.96 or later.
This section describes how to use the ESG security functions to protect and remove classified proprietary
information stored or displayed in the instrument. All security functions described in this section also have
an equivalent SCPI command for remote operation. (Refer to the “System Subsystem (:SYSTem)” chapter
of the E4428C/38C ESG Signal Generators SCPI Command Reference for more information.)
Understanding Memory Types
The ESG comprises several memory types, each used for storing a specific type of data. Before removing
sensitive data, it is important to understand how each memory type is used in the signal generator. The
following tables describe each memory type used in the base instrument, optional baseband generator, and
optional hard disk.
•
Erase All • Erase and Sanitize All • Erase and Overwrite All
Table 3-1 Base Instrument Memory
Memory Type
and Size
Writable During
Normal Operation?
Data Retained
When Powered Off?
Purpose/Contents Data Input Method Location in Instrument and Remarks
Main
Memory
(SDRAM)
64 MB
Yes No firmware operating memory operating system
(not user)
CPU board, not battery backed.
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