= About Lock-In Amplifiers by Stanford Research Systems
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{tag=Work by Stanford Research Systems}
Official application note: https://www.thinksrs.com/downloads/pdfs/applicationnotes/AboutLIAs.pdf
Application Note 3. No publication date is inferred. Physical pages 1–2 describe synchronized multiplication, low-pass rejection of sum <frequencies>, detection bandwidth and two quadrature outputs. Noise near the reference remains within the selected passband; coherent background at that <frequency> cannot be distinguished by synchronization alone.
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