Digital Lock-In Amplifiers

SR810 and SR830 ï£§ DSPlock-in amplifiers

SR830 DSPLock-In Amplifier The SR810 and SR830 have differential inputs with 6 nV/ âˆš Hzinput noise. The input impedance is 10 M

SR810 & SR830 DSP Lock-In Amplifiers

â„¦, and minimumfull-scale input voltage sensitivity is 2 nV. The inputs can also be configured for current measurements with selectable current gains of 10 Input Channel

· 1 mHz to 102.4 kHz frequency range· >100 dB dynamic reserve · 5 ppm/°C stability · 0.01 degree phase resolution · Time constants from 10

The SR810 and SR830 DSPLock-In Amplifiers provide highperformance at a reasonable cost. The SR830 simultaneously displays the magnitude and phase of a signal, while the SR810 displays the magnitude only. Both instruments use digital signal processing (DSP) to replace the demodulators, output filters, and amplifiers found in conventional lock-ins. The SR810 and SR830 provide uncompromised performance with an operating range of 1 mHz to 102 kHz and 100 dB of drift-free dynamic reserve.

µ sto 30 ks(up to 24 dB/oct rolloff) • Auto-gain, -phase, -reserve and -offset • Synthesized reference source • GPIB and RS-232 interfaces• SR810 ... $3850

The dynamic reserve of a lock-in amplifier, at a given full-scale input voltage, is the ratio (in dB) of the largest interfering
6 and 10
8 V/A. Aline filter (50 Hz or 60 Hz) and a 2 × line filter (100 Hz or 120 Hz) are provided toeliminate line related interference. However, unlike conventional lock-in amplifiers, no tracking band-pass filter is needed at the input. This filter is used by conventional lock-ins to increase dynamic reserve. Unfortunately, band pass filters also introduce noise, amplitude and phase error, and drift. TheDSPdesign of these lock-ins has such inherently largedynamic reserve that no band pass filter is needed. Extended Dynamic Reserve
(U.S. list)

• SR830 ... $4500

(U.S. list)

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