294 Keysight NFA Series Noise Figure Analyzers Service Guide
CPU/Disk Drive Troubleshooting
A4 Processor Description
System Memory
The type and amount of system SDRAM in the instrument may vary depending
on the age and options installed in an instrument. Current instruments have
16 GB of DDR3 SDRAM in two 204-pin SODIMM memory modules.
The system SDRAM memory is not field replaceable.
System Processor
The processor used in the instrument may vary depending on the age and
options installed in an instrument. Current instruments have a Dual Core
Celeron processor chipset.
The system processor chipset is not field replaceable.
Processor Battery
The A4BT1 Processor battery used is a lithium manganese dioxide coin battery.
It powers the instrument clock and maintains the settings for the CMOS BIOS
configuration.
The A4BT1 Processor battery is field replaceable. See Chapter 14,
“Replaceable Parts” for the correct replacement part number.
SD Memory Card Slot
The main purpose for the SD memory card is for instrument calibration
database backup.
The SD memory card that is shipped with each new instrument is currently a
16 GB SDHC card. It is shipped with a backup of the instrument's factory
calibration database.
The SD memory card can be removed if need for security or other reasons and
the instrument will function as normal. The SD card can also be manually
switched to the Lock (read only) position and the instrument will function
normally as well.
While the instrument working calibration database is contained on the E: drive,
if when the instrument first boots up and finds a newer database on the SD
memory card it will prompt the user to select which database to use. This is
intended for use when the A5 disk drive assembly has been changed and the
calibration database needs to be transferred to it.
The SD memory card is field replaceable. See Chapter 14, “Replaceable Parts”
for the correct replacement part number.
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