The internal chronometer was a part of a Soong-type android's construction. It functioned as a timekeeping device and could be switched off. (TNG: "Timescape")

Data's internal chronometer was stopped by the solanogen-based lifeforms when they abducted the android. When comparing his internal chronometer to the USS Enterprise-D's chronometer, Data realized that he had been off the ship for more than ninety minutes. (TNG: "Schisms")

In 2369 after Counselor Deanna Troi saw Captain Picard, Data, and Geordi La Forge "frozen in time", Data checked his internal chronometer but couldn't find any discrepancy between his chronometer and the ship's computer. This experience and the crew's rescue of the Enterprise-D from a situation in which it, too, was "frozen in time" led Data to conduct experiments regarding his perception of time, based on the aphorism "a watched pot never boils." His experiments led him to believe that he was not capable of perceiving time any differently than his internal chronometer, but Commander William T. Riker noted that Humans do not have internal chronometers and suggested that he shut it off. (TNG: "Timescape")

In 2370, Data's dream program caused him to oversleep, but it was not due to a problem with his internal chronometer. (TNG: "Phantasms")

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