Analyzer Initialization - Agilent Technologies 8590 Series Service Manual

Backing Up and Reloading Correction Constants

Analyzer Initialization

Analyzer Initialization
This procedure is used to restore the factory/service correction
constants to the processor/video board assembly, and to initialize the
analyzer settings after a non-volatile memory loss. The loss of
non-volatile memory may be caused by the following conditions.
• Installation of a new A16 Processor/Video board assembly
• Dead B1 battery
Firmware startup sequence
The firmware installed in the analyzer recognizes when the analyzer
non-volatile memory is lost by comparing the contents of two RAM
locations with known values. If there is a discrepancy, the startup
routine is initiated.
The analyzer startup routine does the following:
• User memory is erased
• DLP editor memory is initialized
• Power-on state is set to PRESET
• Windows are initialized
• Video constants are initialized
• Display units are set to dBm
• Identifies which analyzer is present except for the following
analyzers.
8591C
8590D
8595E
8592D
If the analyzer is either an 8595E or 8596E, the screen will prompt
you to enter the correct analyzer model number. Enter 5 for an
8595E or a 6 for an 8596E spectrum analyzer.
After the startup routine is complete, the message USING DEFAULTS
<n> is displayed on screen. The value of <n> is a key to what condition
caused the startup sequence. This number was used in the development
of the firmware and is of no value in troubleshooting.
In the case of an 8591C cable TV analyzer, the firmware is unable to
identify this model number. After the loss of correction constants, an
8591C cable TV analyzer will actually identify as an 8591E spectrum
analyzer.
204 Chapter 3