Lock-in amplifier DXA-001

signaldifferentialanalog

Input Channel With the low-noise analog pre-amplifier, the signal input of DXA-001 can be switched to operate in the single-ended or differential voltage mode, and the input noise is 10 nV/√Hz. The input impedance is 10 MΩ and the full-scale input voltage sensitivity ranges from 1 nV to 1V. Besides, DXA-001 can also be used for current measurements with variable current gains of 10^6 or 10^8 V/A. 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-001 has an inherently large dynamic reserve up to 100dB. The sampling rate of 312.5KSPS is determined by a precision 24-bit A/D converter and a specific filter is designed to avoid aliasing. Reference Channel In order to provide the reference signal for DXA-001, 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.