Hi Penghui,
This would most likely be a problem with the 80 MHz harmonic generator. What
you are seeing, is a phase stability issue with the higher sideband generated
for the highband observe. The fact that it moved with the swap, the channel
board is probably OK. Easy fix.....?! it depends on the problem at hand. We
don't have schematics for these things.......
Regards,
John E. Hahn
CAZ Enterprises, LLC
6320 Fly Rd. Ste 207
East Syracuse, NY 13057
Ph. 315-727-8192
http://www.Cazent.com
________________________________
> From: main_at_ammrl.groups.io on behalf of Lin, Penghui via groups.io
> Sent: Friday, February 28, 2025 14:33
> To: main_at_ammrl.groups.io
> Subject: [AMMRL] #agilent #Hardware #VarianAgilent
Dear AMMRLers,
We had a 600 MHz Agilent DDR2 system.
I recently noticed the proton channel (1st channel) tune has some problems.
It shows very noisy signals (first picture). But the carbon channel (channel 2)
is normal.
If I swapped the cables on the VFS between channel 1 and channel 2, and the
proton went back to normal and I am having troubles with carbon tune now.
(proton tune back to normal 2nd picture).
When I check the signals coming out from the VFS on channel 1 and channel 2
with an oscilloscope, the "problematic" channel 1 signals look like 3rd
picture and the normal channel 2 signals look like the last picture.
Does this mean this VFS board has problems? If so, is there an easy way to
fix it?
Thanks,
Penghui
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Received on Fri Feb 28 2025 - 13:51:39 MST