3-36 Service Guide
Adjustments and Correction Constants 8719ET/20ET/22ET
Loading Firmware 8719ES/20ES/22ES
RF Network Analyzers
Loading Firmware
The following procedures will load firmware for new or existing CPU boards.
Required Equipment and Tools
• Firmware disk for your network analyzer.
Analyzer warmup time: None required.
Loading Firmware into an Existing CPU
Use this procedure for upgrading firmware in an operational instrument whose CPU board
has not been changed.
1. Turn off the network analyzer.
2. Insert the firmware disk into the instrument's disk drive.
3. Turn the instrument on. The firmware will be loaded automatically during power-on.
The front panel LEDs should step through a sequence as firmware is loaded. The
display will be blank during this time.
At the end of a successful loading, the LEDs for Channel 1 and PORT 1 (REFLECTION
port on ET models) will remain on and the display will indicate the version of firmware
that was loaded.
In Case of Difficulty
If the firmware did not load successfully, LED patterns on the front panel can help you
isolate the problem.
• If the following LED pattern is present, the firmware disk is not for use with your
instrument model. Check that the firmware disk matches your analyzer model.
• If any of the LED patterns in the table on page 3-37 are present, the firmware disk may
be defective.
LED Pattern
Chan 1 Chan 2 Chan 3 Chan 4 R L T S
✸✸
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