Service Guide 3-33
8719ET/20ET/22ET Adjustments and Correction Constants
8719ES/20ES/22ES EEPROM Backup Disk Procedure
RF Network Analyzers
EEPROM Backup Disk Procedure
The correction constants that are unique to your instrument are stored in EEPROM on the
CPU (A7) assembly. By creating an EEPROM backup disk, you will have a copy of all the
correction constant data for that analyzer, should you need to replace the CPU (A7)
assembly in the future.
Required Equipment and Tools
1. Insert a 3.5-inch disk into the analyzer disk drive.
2. If the disk is not formatted, follow these steps:
a. Press the following:
b. Select the format type:
• To format a LIF disk, select .
• To format a DOS disk, select .
c. Press and answer at the query.
3. Press the following:
NOTE The analyzer creates a default file “FILE00”. The filename appears in the
upper-left corner of the display. The file type “ISTATE(E)” indicates that the
file is an instrument state with EEPROM backup.
NOTE If you are using a external keyboard to enter data, you must press
after plugging it in the DIN keyboard connector on the rear panel.
Equipment Description 8719ET/ES
8720ET/ES
8722ET/ES
3.5-inch Floppy Disk One formatted 1.44 MB disk
Preset
Preset
Save/Recall
System
Save/Recall
Preset
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