Every analytical instrument will give an answer; whether that answer is right or wrong or the power is off is a different story. Knowing how to troubleshoot an instrument or setup a specific experiment can be just as important as knowing how to interpret the data resulting from that instrument.
A great way to learn about NMR instrumentation is from the NMR spectroscopists who have the extensive experiences and who are willing to share their knowledge with others. One such example is the NMR blog belonging to Glenn Angus Facey Ph.D. a.k.a. Bubbles (the NMR facility manager at the University of Ottawa). I admit I know the individual personally so my opinion is biased.