In the context of power supplies and measurement instruments, drift refers to the slow, undesirable change in an output parameter, such as voltage or current, over time, even when external conditions like ambient temperature and load are held constant. It is a form of measurement error that affects the long-term stability of a device.
For example, while there is no change in temperature during measurement, slight increases will be seen in the measured value.
Drift is typically caused by factors such as the aging of internal components, self-heating of the instrument, or slight variations in ambient temperature that are not fully compensated for.
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