Lock-in amplifier boasts low noise
-- Test & Measurement World, 6/1/2008 2:00:00 AM
The Model 7124 lock-in amplifier from Signal Recovery provides an all-analog front-end remote connection unit (RCU), to which signal and reference connections are made, and a DSP main instrument console connected via a fiber-optic link. In normal operation, there are no digital clock signals within the RCU, so it emits no switching noise. This architecture gives the advantages of DSP technology for signal detection as well as the low-noise performance that the company claims is typically available only in instruments of all-analog design.
The 7124’s main console is a compact bench unit with a color display and keys for operating the instrument controls, accessing different menus, and entering numeric values. It receives signals from the RCU module and processes them using DSP algorithms running in a dedicated FPGA supported by a ColdFire processor. The amplifier has an operating frequency range of 0.5 Hz to 150 kHz with a main ADC sampling rate and analog output DAC update rate of 1 MHz. The Model 7124 also provides output filter time constants ranging from 10 µs to 100 ks.
Signal Recovery, www.signalrecovery.com.
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