76 Keysight E8357D/67D & E8663D PSG User’s Guide
Basic Operation
Using Security Functions
Using Security Functions
This section describes how to use the PSG’s 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 Commands” chapter of
the
Keysight PSG Signal Generators SCPI Command Reference
for more
information.)
Understanding PSG Memory Types
The PSG 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 PSG. The following tables describe each memory
type used in the base instrument, baseband generator (Option 601, 602), hard
disk (Option 005) or removable compact flash drive (Options 008 and 009).
Table 2-2
Base Instrument Memory
Memory
Type
and Size
Writ
ab
le Duri
ng
Da
ta
Reta
in
ed
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.
Main
Memory
(Flash)
20 MB
Yes
Yes
factory
calibration/configurati
on data
user file system, which
includes instrument
status backup, flatness
calibration, IQ
calibration, instrument
states, waveforms
(including header and
marker data),
modulation definitions,
and sweep lists
firmware
upgrades and
user–saved data
CPU board (same chip as firmware memory, but
managed separately)
User data is not stored in this memory if hard
disk (Option 005) or the removable compact
flash drive (Option 008 or 009) is installed.
Because this 32 MB memory chip contains 20
MB of user data (described here) and 12 MB of
firmware memory, a selective chip erase is
performed. User data areas are selectively and
completely sanitized when you perform the
Erase and Sanitize
function.
