SR510/530 Lock-In Amplifiers0 pages

Lock-In Amplifiers
SR510 and SR530 — Lock-in amplifiers

SR530 Lock-In Amplifier

SR510 & SR530 Lock-In Amplifiers
The SR510 and SR530 are analog lock-in amplifiers which
can measure AC signals as small as nanovolts in the presence
of much larger noise levels. Both the single phase SR510 and
the dual phase SR530 have low-noise voltage and current
inputs, high dynamic reserve, two stages of time constants,
and an internal oscillator. In addition, both lock-ins come
equipped with a variety of features designed to make them
simple to use.

· 0.5 Hz to 100 kHz frequency range
· Current and voltage inputs
· Up to 80 dB dynamic reserve
· Tracking band-pass and line filters

Sine Wave Mixing

· Internal reference oscillator (opt.)

The core of the SR510/SR530 is a precision analog sinewave multiplier. Lock-ins use a multiplier (demodulator) to
translate the input signal (at the reference frequency) down to
DC where it can be filtered and amplified. Many lock-ins use
square wave multipliers which introduce spurious harmonic
responses. The SR510/SR530 use clean sine-wave multipliers
which are inherently free of unwanted harmonics.

· Four ADC inputs, two DAC outputs
· RS-232 interface (std.)
· GPIB interface (opt.)

Signal Input
The SR510 and SR530 have differential inputs with
7 nV/√Hz of input noise and 100 MΩ input impedance. The
input can be configured as a voltage input, or as a current
input with 106 V/A gain and an input impedance of 1 kΩ to
virtual ground. Full-scale sensitivities from 500 mV down to
100 nV are available.

· SR510 ... $2495 (U.S. list)
· SR530 ... $2995 (U.S. list)

Three input prefilters can be selected. The first is a line notch
filter providing 50 dB of rejection at the line frequency. The

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