Keysight E4428C, Manual

Page: 15 / 32

Security Features & Document of Volatility 15
Instrument Memory & Volatility
ESG Memory
3. Firmware
Memory
(Flash)
12 MByte
No Yes Main firmware image Factory
installed or
firmware
upgrade
CPU board
(same chip as
main flash
memory, but
managed
separately)
During normal
operation, this
memory cannot
be overwritten
except for LAN
configuration.
Because this
32 MB memory
chip contains
20 MB of user
data and 12 MB of
firmware memory
(described here), a
selective chip
erase is
performed.
User data areas
are selectively and
completely
sanitized by the
procedure “Erase
and Sanitize All
(Option 006 Only)”
on page 22 .
Yes Yes LAN configuration Front panel
entry or
remotely
4. Battery Backed
Memory
(SRAM)
512 KByte
Yes Yes User-editable data (table
editors)
Last instrument state,
last instrument state
backup, and persistent
instrument state and
instrument status
Firmware
operations
CPU board
The battery is
located on the
motherboard.
Sanitized by the
procedure
described in
“Erase and
Sanitize All
(Option 006 Only)”
on page 22 .
5. Bootrom
Memory
(Flash)
128 KByte
No Yes CPU bootup program and
firmware loader/updater
Factory
programmed
CPU board
During normal
operation, this
memory cannot
be overwritten
or erased.
None required (no
user data)
6. Calibration
Backup Memory
(Flash)
512 KByte
No Yes Factory calibration/
configuration data
backup
Factory or
service only
Motherboard None required (no
user data)
Table 4-3 Base Instrument (All models and options)
Memory
Component,
Type and Size
Wr
itab
le Dur
ing
No
rm
al
Operat
ion?
Data
Reta
ine
d When
Po
we
re
d Of
f?
Purpose/Contents Data Input
Method
Location in
Instrument and
Remarks
Sanitization
Procedure