NF Corporation LI5640

LI5640 NF Corporation Lock In Amplifier

Digital Lock-in Amplifier

The LI5640 is a 100 MHz Lock In Amplifier from NF Corporation. Amplify RF and Microwave signals to measure, test, and design circuits. Applications include radio communications, cellphones, EMI testing, and much more.

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NF Corporation LI5640 Features:

  • Range: 1 mHz – 100 kHz, 2 nV
  • Reference signal: In / external / signal
  • Output: Measurement items: X, Y, R, θ, NOISE, AUX IN
  • Value, Meter, External DC output: 2 output
  • X, Y, R,θrenewal rate: 256k sample/sec
  • Internal Oscillator
  • High stability
  • Measurement is possible starting from 1 mHz
  • Prompt and smooth measurement responses
  • Instantaneous responses when settings are switched
  • Easy operation
  • Minimum time constant 10µs is realized
  • Voltage sensitivity: 2nV full-scale to 1V full-scale
  • Current sensitivity: 5fA full-scale to 1µA full-scale
  • Line filter effectively eliminating the ham noise
  • Can set not to use anti-areas filter (THRU) for super high-speed response
  1. The LI5640 multi-function digital lock-in amplifier. The amplifier features high stability and low drift designs in which all processes have been digitized except for the preamplifier used for input. Zero output drift was reduced to miniscule levels in the high sensitivity regions. Phase stability is 0.01°/°C and gain stability is ±100 ppm/°C. This high stability has formed the backbone for high resolution of 4 1/2 digits and the low noise levels indicated by input referred noise voltage of 4.5 nV/ √Hz and phase noise of 0.001°. These features enable very reliable small signal measurements.