AMMRL: Bruker AM Graphics Display Processor - Offset Adjust
Ulrich Haunz (Ulrich.Haunz@uni-konstanz.de)
Thu, 14 Feb 2008 14:40:10 +0100
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Hello,
at our university we had also some nice AC 250 MHz instruments.
Someone showed also this 'strange' behaviour. I tried what a
Bruker service engineer told, but this does not work.
This was to change under the keyboard a potentiometer slightly
to get the Lock back into the middle.
Now I took a edding marker and marked this place on the screen.
After a reset the console went back ... and after a couple
of time back to this offset position ...
It was easy to clean the mark with Propanol-2 and remark it ...
This was helpful.
Bye
Ulrich Haunz
> Are there any old timers out there who remember the GDP? We replaced
> ours with one donated from the Univ. of Pennsylvania, and now the
> "sweet spot" of the lock (the point on the screen where the lock
> sweep "wiggles" have to be positioned to get it to lock) has moved
> off the right edge of the screen. We can still lock it if we set the
> Field to the old value that used to be the center of the screen, but
> it's difficult for teaching purposes because they never see the lock signal.
>
> There are two potentiomers in the Lock Board of the GDP, one shown in
> the schematics close to the "OFFSET" output and one close to the
> "SWEEP" output. Changing the "OFFSET" pot does move the lock display
> left and right on the screen, but it also affects the lock amplitude,
> and it doesn't get us to the center even when cranked all the way to
> one edge of the adjustment. The "SWEEP" pot seems to affect the lock
> phase. Are there any other adjustments I can try? I seem to
> remember on the old (piano style) AMX consoles an adjustment under
> the keyboard, but I can't find anything there in our AM. Is there an
> adjustment in the actual lock circuitry (lock receiver?) that would do this?
>
> Any advice would be appreciated. We are running an NMR museum here,
> but it just keeps running and the users like it.
>
> Neil
>
>
> Neil E. Jacobsen, Ph.D.
> NMR Facility Manager
> Department of Chemistry
> 119 Old Chemistry
> 1306 E. University
> University of Arizona
> Tucson, AZ 85721
> 520-621-8146
> FAX 520-621-8407
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