
Correction Constants and Firmware 8712ET/ES and 8714ET/ES
Storing and Recalling Correction Constants (CC) RF Network Analyzers
8-4 Service Guide
Storing Correction Constants to EPROM
This will copy the current contents of the analyzer's CC data that is contained in RAM to
permanent storage in the EPROM. This procedure should be done when you are satisfied
that the current correction constants in temporary RAM are complete and correct. Once
stored to EPROM, a backup copy should made on a floppy disk using the “Storing
Correction Constants to Disk” procedure.
1. Press .
Installing Correction Constants from Disk
This procedure automatically loads CCs from disk and stores them in EPROM. This
procedure is typically done after replacing the CPU board assembly in order to return the
analyzer to its previously calibrated state.
1. Insert the proper correction constants disk into the internal disk drive.
2. Press .
In Case of Difficulties
If the message ROM Appears to be Blank is displayed on power-up, try re-loading
firmware from disk. Refer to “How to Upgrade or Re-Install the Firmware” on page 8-5.
If the message Warning: No Correction Constants Installed is displayed on power-up,
install the correction constants from disk using the “Install Correction Constants from
Disk” procedure.
If you suspect that the current CC data is inaccurate, first try reinstalling CC data using
the “Install Correction Constants from Disk” procedure. If this does not seem to improve
the situation, try erasing all of Static RAM (SRAM) by using the following procedure. Note
that this will erase any data in the non-volatile RAM, but it will not affect the CC data.
1. Cycle the analyzer's power.
2. After about 25 seconds, the analyzer will emit a double beep. Immediately after this
double beep, press several times.
3. The analyzer will pause after performing the CPU main self-tests and ask if you want
to zero the SRAM. Answer YES by pressing the key.
4. When the analyzer completes its power up routine, it will be placed in the factory
default condition. Verify that the analyzer is now producing correct measurement
results. If not, the analyzer may have to be repaired or re-calibrated.
NOTE If the CC data still appears to be inaccurate, perform the adjustments in
Chapter 2, “Adjustments.”
SYSTEM OPTIONS
SYSTEM OPTIONS
PRESET
BEGIN
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