7300 Series VSM System User's Manual by Lake Shore Cryotronics (source code)

= 7300 Series VSM System User's Manual by Lake Shore Cryotronics
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https://www.lakeshore.com/docs/default-source/product-downloads/7300_manual.pdf

Section 4.1: pickup-coil signal, vibration amplitude/frequency, calibration and synchronous detection. Manufacturer documentation for the instrumental principle.