Date: Wed, 20 Mar 2013 20:43:22 +0000
Finally have a chance to update all of you on my issue of the lock phase flipping or weird things with my lock.
I had many responses that I followed up on but the answer was .... the relay.
What was happening; After gradient shimming the channel was not switching back, so when I or the automation find zo went looking for the lock signal, we were getting fooled and thinking it is 180 degrees from the actual. We would find something but the signal was very low and then lock on that.
History
I was able to narrow it down on my own and with the help of Agilent sending parts that it was in the magnet leg and if I jiggled the lock cable the lock would come back to normal, sometimes.
We changed the band pass filter, the elbow connector, BNC connectors and the lock cable with no good results.
Then I had to call in for someone to replace the relay ( I don't welded), boom...I haven't had an issue in 2 weeks.
I wanted to make sure that was the answer before I update everyone.
Thank you everyone, you rock.
Cheers Kim.
________________________________
Kimberly Yach
NMR Specialist
Analytical Chemistry
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________________________________
From: Greg Wylie [mailto:gwylie_at_uga.edu]
Sent: Monday, February 04, 2013 3:38 PM
To: Yach, Kimberly A
Subject: AMMRL: Lock phase shifting/flipping on Agilent Mercury Plus throughout the day
HI Kim
I hope you have already gotten this fixed but if not let me ask some questions?
When is this happening, are you trying to lock manually and notice the value is off or is this during auto lock? Are you using automation of some kind?
If you have replaced boards then I would start more basic. Do you have bad connection on the lock cable? These BNC do go bad our systems are older then yours and I am having to replace cables or connections pretty routinely now.
I have also had the relay used for shimming go bad this caused lots of trouble.
If this is happening during autolock you might want to consider just reloading the software maybe something has gotten messed up. I have seen this more with VnmrJ then 6.1C (6.1C is pretty stable) but you never know.
Always a good one to check are the power supplies and make sure they are stable. If one is fluctuating maybe it could cause the lock to dip and then the system try to adjust phase to bring it back?
Someone else on here may have other ideas too these were my first thoughts.
Good luck
Greg
From: "Yach, Kimberly A" <kimberly.yach_at_abbvie.com<mailto:kimberly.yach_at_abbvie.com>>
Subject: AMMRL: Lock phase shifting/flipping on Agilent Mercury Plus throughout the day
Date: February 1, 2013 1:53:43 PM EST
To: "ammrl_at_ammrl.org<mailto:ammrl_at_ammrl.org>" <ammrl_at_ammrl.org<mailto:ammrl_at_ammrl.org>>
Dear users:
Please help.
Somehow over a course of batch of samples the lock phase changes and then switches back to original lock phase.
We (service engineer) have boards replaced (lock trans, lock rec, shim dac) but nothing has solved the issue.
It doesn't depend on solvent or type of compound dissolved in the NMR sample, it just seems that the system just flips lock phase randomly throughout the day.
This is an older instrument (~10 years) and still running vnmr 6.1C on an Sun system.
We have even seen it with the lineshape sample also....
Has anyone seen this before and have any suggestions to what we should look into?
Thanks
Kim.
________________________________
KIMBERLY YACH
NMR Specialist
Analytical Chemistry
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Chemsitry Department
100 Research Drive
Worcester MA
01607
OFFICE +1 508-849-2520
EMAIL kimberly.yach_at_abbvie.com<mailto:kimberly.yach_at_abbvie.com>
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-- *****ATTEN***** Please note new email address gwylie_at_uga.edu<mailto:gwylie_at_uga.edu> Greg Wylie, Ph.D Director of NMR Facility University of Georgia Department of Chemistry Athens, Ga 30602-2556 Office: 706.542.1502 Fax: 706.542.9454 Cell: 706.206.0007 Website: www.uga.edu/nmr<http://www.uga.edu/nmr>
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