Additionally, the second vertical velocity is typically high pass filtered to reduce errors due to long-term drift.

†Does not include long-term drift, resistance traceability adds additional ± 0.0025 %.

Long-term drift of 0.01°C at 0°C after 100 hours at 1000°C

Long-term stability / Long-term drift: The change of accuracy due to aging under certain reference conditions during a certain period of time, typically 1 year.

The automatic frequency correction value applied by a receiver is altered to minimize long-term drift of a path delay profile.