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T i m e A c c u r a c y
The internal clock in the HOBO U30 Station is set by the time on the HOBOlink server and the time zone
offset from UTC that you select when you configure the device. UTC, or Coordinated Universal Time, is
similar to Greenwich Mean Time.
The time zone offset makes it possible to determine objective, non-local time. This prevents conflicts and
confusion before a Spring or Fall time change.
There are two common sources of errors with time reporting.
•
Launch time loss
The HOBO U30 Station may lose up to two seconds when it is launched. This is unavoidable.
•
Clock drift
The long-term time accuracy is related to ambient temperature. At 25°C (77°F), the worst-case
error is ±8 parts per million (PPM), or about 5 seconds per week. The error increases as the
temperature deviates from 25°C, as shown in the graph below. At a constant temperature of 20°C,
the logger time error could be as much as 35 PPM (21 seconds per week).
User's Guide
Onset Computer Corporation
- 70 -
HOBO U30 Station/RC
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