Model 7225 DSP Lock-in amplifier

Model 7225 DSP Lock-in amplifier

The model 7225 offers a cost-effective solution to the researcher needing the performance provided by DSP demodulation but not requiring the additional features or higher operating frequencies of the models 7280 and 7265.

The instrument performs all of the normal measurements of a dual phase lock-in amplifier, measuring the in-phase and quadrature components, vector magnitude, phase angle and noise of the input signal. The model 7225 is extremely easy to use. All instrument controls are adjusted via the left-hand display panel and its associated keys, while the right hand panel shows the two selected instrument outputs. Auto functions need only two key presses to activate and in many cases eliminate the need for manual control adjustment.


  • 1 mHz to 120 kHz operation
  • Voltage and current mode inputs
  • Direct digital demodulation
  • 10us to 100ks output time constants
  • Synchronous oscillator output
  • Quartz crystal stabilised internal oscillator
  • RS232 and GPIB computer interfaces



This product could be used for the following applications:

  • Chopped light measurements
  • AC bridge measurements
  • Audio studies
  • AC impedance studies
  • Vibration studies
  • Thermal wave detection


This product is manufactured by SIGNAL RECOVERY.

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