Hi.We have a 500 MHz AVANCE-DRX spectrometer and I have a question about it .How we can understand that the amplifier has been weakened?
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[Question from NMRWiki Q&A forum] Amplifier Error
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Hi All, I am worikng with 500Mhz Bruker. Recently 3rd channel is installed in my institute when i run 3D HNCA experiment with t2 increments (64)for higher resolution. I warned with an amplifier error message and stops experiments. Can anyone help in this regards. Thank you in advance.
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solution to a basic nmr problem, practice problem 3
The solution to a good, basic practice nmr and IR problem at Bryn Mawr College by M Nerz
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[Question from NMRWiki Q&A forum] dmf problem in vnmr
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Hi, dear all,
I try to use garp1 sequence for decoupling with the statement " obsprgon("garp1", pw, angle, 0) ".
If angle = 1.0, when pw = 4us or larger than 4us, the sequence works. When pw less that 4us, it shows the error "effective dmf too high prg dec on on controller dec".
If angle = 2.0, when pw = 2us or larger than 2us, it works. When pw less that 2us, the it shows the same error message.
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06-27-2011 04:31 PM
[Question from NMRWiki Q&A forum] Why RF irradiation will damage amplifier?
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Here our 1H amplifier of NMR spectrometer is damaged twice for long time or high power RF irradiation. Why the duty cycle is important for amplifier or probe?If the damage happens to amplifier, which part of it is broken?
edit: The type of our spectrometer is Varian InfinityPlus for solids bought in 2003. I have no idea about the sort of amplifiers, just know the amplifier is for power output. Someone used about 80kHz 1H power for 1H decoupling during 100-200ms acquisition. The efficiency of the amplifier output droped gradually. The efficiency...
nmrlearner
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[Question from NMRWiki Q&A forum] COSY problem
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I am running COSY on a DNA:RNA hybrifd. However, I have got no cross-peaks at all even for CYT H5-H6? what do you think the problem is? I am using cosydfesgpph as pulse programme.
Thank you