Hi, Bob,
I had worked on an INOVA500. It had a similar situation when we connet with a regulator. We got a 50 Hz noise sideband noise for all peaks in China. Changed to another regulator, the sidebands disappeared. You may try to check the power supply. Good luck.
Nice weekend,
Feng, Rui
Department of Biochemisty
Hong Kong University of Science and Technology
Clear Water Bay, Kowloon, Hong Kong
Tel:852-23587283
Email:r.feng_at_ust.hk
----- Original Message -----
From: "Charles G. Fry" <cgfry_at_wisc.edu>
To: "ammrl" <ammrl_at_chemnmr.colorado.edu>
Cc: "Bob Shanks" <rbshanks_at_wisc.edu>
Sent: Saturday, September 09, 2006 4:52 AM
Subject: AMMRL: 60 Hz noise from lock
> Hi all:
>
> I am forwarding the following for our facility engineer:
>
>
> We have a Unity 500 console upgraded in 1998 with an Inova 23 channel
> shim system. We are observing 60 Hz noise sidebands at 2-3% levels for
> all peaks when locked, but they disappear when unlocked. If any of you
> have experienced similar problems in the past, we'd appreciate hearing
> about your experiences and fixes.
>
> It would also be very helpful to find out the following for our Unity
> 500 console. It was upgraded from a VXR way back when (in 1989), and
> our documentation does not match the boards (which we think might be the
> original VXR boards) currently in use in the console:
>
> 1. The acceptable voltage level (peak-peak) for the 6.25 MHz IF input
> into the lock receiver board.
> 2. The acceptable voltage level (peak to peak) for the 0 and 90 degree
> outputs on connector J2405. (At a given lock level)
> 3. The approximate wave form for the 0 and 90 outputs.
>
> Thanks,
> Bob
>
> Bob Shanks
> NMR Instrumentation Technologist
>
> Chemistry Instrument Center (608) 262-0563
> University of Wisconsin FAX: (608) 262-0563
> 1101 University Ave Room 2237A
> Madison, WI 53706 rbshanks_at_wisc.edu
>
>
>
Received on Sun Sep 10 2006 - 07:19:40 MST