Lock-In Amplifier for myRIO by Delacor LLC Turn Your myRIO Into a Precision Measurement Instrument

  • Extract low-level signals buried in the noise
  • Extend your myRIO analog input resolution beyond 12 bits
  • Take advantage of built-in square-wave excitation signal generation
  • Use selectable input highpass filter and programmable output filter
  • Learn about lock-in amplifiers with detailed documentation
  • Get started easily with heart-rate measuring experiment
  • Download
The Lock-In Amplifier for myRIO by Delacor LLC uses the myRIO-1900 portable reconfigurable I/O device to implement a lock-in amplifier in the FPGA. The application measures a modulated signal and a reference signal, which can also be generated with myRIO. The lock-in amplifier can measure very low level input signals even if they are buried in noise or are smaller than myRIO’s 12-bit resolution. It includes a selectable highpass filter to remove any input DC offset and features a programmable output lowpass filter that removes any noise beyond the frequencies of interest.

This amplifier application is geared toward education and understanding the principles of a lock-in amplifier. It includes extensive documentation and instructions for building a circuit to measure heart rate by using an LED and photodiode amplifier to measure the amount of light absorbed through the blood vessels in a finger.

Support Information
This add-on software requires LabVIEW software installed with myRIO hardware and software.

This software is provided and supported by Delacor LLC and not by NI. For technical support, contact Delacor LLC at https://decibel.ni.com/content/groups/delacor-toolkits.

For additional support options with this add-on software, view “myRIO Software Requirements Documentation” and “myRIO Forum” under the Resources tab.

Disclaimer: The Third-Party Add-Ons for LabVIEW on this page are offered by independent third-party providers who are solely responsible for such products. NI shall have no responsibility whatsoever for the performance of the Third-Party Add-Ons. The sale of these Third-Party Add-Ons is subject to the Terms and Conditions of Sale of the third-party provider. For important information regarding the sale of Third-Party Add-Ons and application Terms and Conditions of Sale, refer to ni.com/tpp.

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