The techniques of this disclosure enable accurate measurement of end-to-end latency of a fingerprint sensor, e.g., of a mobile device. A touch sensor in proximity to the fingerprint sensor is coupled to an oscilloscope. A photodiode in proximity to the screen of the device is coupled to another channel of the same oscilloscope. An accelerometer attached to the device to measure device vibrations, and is coupled to yet another channel of the same oscilloscope. The oscilloscope logs the signals generated by the touch sensor, the photodiode, and the accelerometer. An accept decision results in the brightening of the device screen and a corresponding increase in photodiode signal. A reject decision results in the haptics motor issuing a double-pulse vibration. End-to-end latency is measured accurately and free of human reaction-time error by measuring via the oscilloscope the time elapsed between the signals generated by the touch sensor and the photodiode, or the touch sensor and the accelerometer.
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Rodriguez, Jose and Sammoura, Firas, "Measuring end-to-end latency of fingerprint authenticators", Technical Disclosure Commons, (December 28, 2018)