A system including a logging tool that comprises a pulser, and a sensor assembly removably attached the pulser while the logging tool is outside of a wellbore, where the logging tool operates the pulser and causes change of a detectable object in the pulser, wherein the sensor assembly detects change of the detectable object and transmits a signal to a data acquisition computer that is representative of the detected change. A method including operations of removably attaching a sensor assembly to a body of a pulser of a logging tool, detecting operation of the pulser via the sensor assembly, and emulating pressure pulses from the pulser by converting, via the sensor assembly, the detected pulser operation into synthetic pressure pulses.