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Shimming on the FID Shimming on the FID works best if the sample has only a few very large resonances.
It can be difficult to remove the beating pattern when the shims are almost optimized. Change a shim by 100 points and move it back to the optimum value.
1. Set up parameters for a single-pulse experiment (np=16384, sw=4400, d1=0). Set carrier frequency at least 1 ppm from the largest peaks. 2. Type gf and connect to the acqi window. Click on grid. 3. If the FID has a beating pattern, adjust z2 and/or z4 until the FID has a smooth decay. 4. Adjust z3 and z3 until the FID has the slowest decay. 5. Disconnect from the acqi window to stop shimming. Shim values are saved. lockpower and lockgain changes are NOT saved. 6. Collect a quick spectrum. If peaks are wide or non-lorentzian, start again at step 2.
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[此贴子已经被作者于2006-11-17 19:08:09编辑过]
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发表于 2006-11-16 21:48:56
发表于 2006-12-7 10:10:01
