Hi,
I have just recently got an HP 35665A Dynamic Signal Analyzer.
For the moment there is only one option in it, ID2 - Swept Sine Measurements.
I will soon upgrade it from here:
https://www.glkinst.com/test-equipment/But when I opened the unit to replace the battery, I noticed that there are already extra RAM mounted on my Memory Board.
There are 8 x M5M44256BL (4x256kByte) in the area called "STANDARD RAM" and another 8 x M5M44256BL in the area called "OPTIONAL RAM".
I suppose this means that I have 2MByte of RAM. Why is it called OPTIONAL RAM?
On another place of the board there is a jumper called "RAM" and that is marked "1M". Anyone who know what that is for?
So, now to the question:
Is it possible to replace these RAM circuits and upgrade it to a 4 or 8MByte board?
Pictures of the memory upgrade boards looks very similar to my board.
The only difference I have noticed is the 1M-jumper that is removed on at least the 4MByte board.
(But there might be differences hidden in the Flash memories that looks the behavior...)
And by the way: Anyone who have schematics available for this instrument? I need to do some flout finding on the signal generator.
I have two spuriouses at 24.666 kHz and 34.588 kHz. Might be some bad decoupling or filtering somewhere.
Thanks in advance,
/Sören