Related Experiment Video
Updated: Jul 2, 2026

NMR Spectroscopy as a Robust Tool for the Rapid Evaluation of the Lipid Profile of Fish Oil Supplements
Published on: May 1, 2017
Adjustable phase device for low-frequency NMR experiments
K Weyand1, E Simon, Y Leuchter
1Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-3300 Braunschweig, Federal Republic of GermanyTechnion, Haifa, Israel.
Abstract:
In order to detect low-level NMR signals by bridge methods, a phase displacing device based on principle of voltage addition has been developed allowing the precise bridge balancing over a one decade frequency range. Using analogous multiplier devices for control and adjust circuit the phase adjustment of the output voltage is within +/-3 degrees over a frequency range from 10 to 100 kHz. For input peak-to-peak voltage levels from 0.1 to 1 V the output level is amplitude-stabilized to within 2% for all phase displacements.
Related Concept Videos
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
NMR Spectrometers: Resolution and Error Correction
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
NMR Spectrometers: Overview
Chemical Shift: Internal References and Solvent Effects
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

