METHOD FOR MEASURING NMR-DATA OF A TARGET SAMPLE IN AN NMR SPECTROMETER AND NMR SPECTROMETER

摘要

An NMR spectrometer for carrying out the method according to any one of the preceding claims, the NMR spectrometer (1) comprising a compensation system (5) and a main field magnet (2) with main magnet poles (2a, 2b) for generating a main magnetic field (3), the compensation system (5) comprising:- at least one target sample coil (6) and a lock sample coil (7) positioned in a volume of interest (4), the volume of interest (4) being arranged between the main magnet poles (2a, 2b),- at least one compensation coil (8) for compensating a drift of the main magnetic field (3) within the volume of interest (4),- at least one target channel for generating RF-pulses with a target excitation frequency, and- a lock data treatment system (9) comprising a lock channel (12) for generating RF-pulses with a lock excitation frequency, wherein the lock data treatment system (9) is configured to adapt a compensation current in the at least one compensation coil (8) and to correct simultaneously the target frequency by applying a target frequency correction offset FCO at the target channel.;The inventive NMR spectrometer has an improved lock channel, in particular for measurements where lock coil and the target coil are to be positioned at a separate position within the volume of interest, thus being placed in different magnetic field environments.