Lock-in amplifier DXA-004

signaldifferentialanalog

Frequency: DC to 60MHz; Time constants: 30ns to 4.4ks; Dynamic reserve: >120 dB; Full-scale Sensitivity: 1 nV to 1 V; Multiple-harmonic measurement; Noise is low to 6nV// √Hz; 5.6-inch color display. Input Channel With the low-noise analog pre-amplifier, the signal input of DXA-004 can be switched to operate in the single-ended or differential voltage mode, and the input noise is 6 nV/√Hz@100 kHz. The input impedance is 50 Ω or 10 MΩ and the full-scale input voltage sensitivity ranges from 1 nV to 1V. Two line filters (50/60 Hz and 100/120 Hz) are designed to eliminate line related interference. The programmable gain amplifier is provided to adjust the dynamic reserve of the system according to the magnitude of the input signal, so that DXA-004 has an inherently large dynamic reserve up to 120dB. The sampling rate of 250MSPS is determined by a precision 14-bit A/D converter and a specific filter is designed to avoid aliasing. Reference Channel In order to provide the reference signal for DXA-004, an externally applied sine wave or square wave, or its own internally synthesized reference source could be used. When the instrument is set to internal reference mode, the internal precision stabilized oscillator and the digital synthesized algorithm are used to generate sinewave output that multiplies the input signal, there is virtually no reference phase noise when choosing internal reference mode.