Adjustable phase device for low-frequency NMR experiments.
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.
Weyand
K
K
Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-3300 Braunschweig, Federal Republic of GermanyTechnion, Haifa, Israel.
Simon
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E
Leuchter
Y
Y