Dear fellow Testequipmentadjusters,
Ist there a level correction procedure out there for any of the E44xx series? Normally, when you put the same RF board back in the same device after successful repair, the level is in the specs. But not always.
Also, does anyone know where the M11X1005 (Edit:corrected) sot89 amplifier is obtainable or a working replacement? Seems to be GaN instead of the old shf0189 GaAs(?).
I tried the manual user flatness, which is ok for home use, but not a neat solution. Also, my device did not work with the E4419 power meter for automatic user flatness correction (after selecting the 19b type of course).
The service manual is kind of a joke. It tells you the name of all the procedures you have to do after RF bd repair, but not how they actually work. Clicking them in the Keysight Software I guess.
My 4Ghz E4438c (with several pretest-repair-stickers on the rf-bd) at 0dBm puts out:
250k 0,83dBm
1M 0,85
100M 0,6
500M 0,44
1G 0,38
1,3G 0,25
1,5G 0,17
1,8G 0,3
2,0G 0,05
2,9G 0,00dBm
3,0G -0,36
3,1G -0,58
....
4,0 -0,07dBm
As measured with a Rohde Z-51.
Any Ideas other than typing all this in the user flatness table?
Best regards,
SC