SR124 Analog Lock-In Amplifier0 pages

Analog Lock-In Amplifiers
SR124 — Analog lock-in amplifier

SR124 Analog Lock-In Amplifier
For over a half century, the lock-in amplifier has been the
instrument of choice for measuring small AC signals in the
presence of noise. Early instruments were designed with
analog electronics, multi-gang mechanical switches, needle
indicators, etc., and measurements were often monitored with
chart recorders. Microprocessor based designs emerged in
the 1980s, and by the early 1990s even the lock-in’s analog
demodulators were replaced by high-resolution ADCs and
digital signal processors (DSP). Remote computer control,
digital readouts and user-friendly front panels all resulted.

· Low-noise, all analog design
· No digital interference
· 0.2 Hz to 200 kHz measurement range
· Low-noise current and voltage inputs
· Harmonic detection (f, 2f, or 3f)

The capabilities of the modern DSP lock-in amplifier in stability,
dynamic reserve, and flexibility were revolutionary, making
it a mainstay for researchers and engineers across multiple
fields. But in moving forward, something was left behind. For
a core group of users, including low-temperature researchers
in particular, the new instruments became a potential source
of high-frequency interference. This is best reflected in the
persistence of one instrument — the PAR124A — still actively
used by many researchers decades after discontinuation by its
long-gone manufacturer.

· Selectable input filtering

Back to Analog

Recognizing that one size shouldn’t have to fit all, SRS is proud
to introduce the SR124 Analog Lock-In Amplifier. Inspired
by the best of an earlier generation’s lock-ins, but availing
itself of today’s low-noise analog components and design
methodologies, the SR124 is an uncompromising tour de
force in low-noise, high-performance analog instrumentation.

· SR124 ... $6950 (U.S. list)

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