Technical data

25
Instrument Memory & Volatility
ESG and PSG Memory
6. Calibration
Backup
Memory
(Flash)
512 KByte
No Yes Factory calibration/
configuration data
backup
Factory or
service only
Motherboard None required
(no user data)
7. Boards
Memory
(Flash)
512 Bytes
No Yes Factory calibration
and information files,
code images, and
self-test limits
Factory or
service only
All RF boards,
baseband
generator, and
motherboard
None required
(no user data)
8. Micro-
processor
Cache
(SRAM)
3KByte
Yes No CPU data and
instruction cache
Memory is
managed by
CPU, not
user
CPU board,
not battery
backed.
Turn off
instrument
power.
a. Sanitization procedures mentioned in this table are not available in E8257N instruments, unless
Option 340 has been installed.
Table 5-6 Vector Models with Baseband Generator (E4438C/E8267D with Options 601 or 602)
Memory
Component,
Type and Size
Writable During Normal Operation? Data Retained When Powered Off?
Purpose/Contents Data Input
Method
Location in
Instrument
and Remarks
Sanitization
Procedure
1. Waveform
Memory
(SDRAM)
40 MByte
320 MByte
Yes No Waveforms (including
header and marker
data) and PRAM
Normal user
operation
Not battery
backed.
User data is
completely
sanitized by the
procedure
“Erase and
Sanitize All” on
page 32.
Table 5-5 Base Instrument (All models and options)
Memory
Component,
Type and Size
Writable During Normal Operation? Data Retained When Powered Off?
Purpose/Contents Data Input
Method
Location in
Instrument
and Remarks
Sanitization
Procedure
a