Time And Timekeeping; Time And Timekeeping Overview; Internal Clock Temperature Compensation; Time Synchronization - Siemens US2:9810T24V User Manual

Time and timekeeping

Time and timekeeping

Time and timekeeping overview

Your meter's internal clock is used for keeping time, timestamping data, and determining intervals
for time-based measurements.
Local meter time is displayed based on the meter's time sync source and the settings used for
time zone and daylight savings time. You can configure and view your meter's date and time
information using ION Setup, or the display.
Your meter monitors time using the frequency of an internal oscillator or the frequency of the line
power being measured. Your meter's battery powers the internal clock so that time is maintained
when the meter is unpowered.
Your meter supports different time types and time synchronization methods to adjust its internal
clock. To improve your meter clock's accuracy, you can use an external time reference such as a
Global Positioning System (GPS) signal, Network Time Protocol (SNTP/NTP) server or Precision
Time Protocol (PTP) leader.
For more information, see the Time Synchronization and Timekeeping technical note, available
on www.usa.siemens.com/pds.
For more information on the Clock module, see ION Reference, available on
www.usa.siemens.com/pds.

Internal clock temperature compensation

The time accuracy of the meter has been improved by compensating for clock drift if the meter's
operating temperature falls outside the optimum temperature range.
Your meter's internal clock is adjusted based on the internal clock temperature compensation
parameters.

Time synchronization

Your meter's clock controls the timing of metering parameters, such as demand intervals or power
quality measurement aggregation over time intervals.
Adjustments to the clock are made by synchronizing the meter's time with another time source,
determined by the Time Sync Source. Time synchronization messages can be automatically
generated and sent to your meter from your energy management system software or other time
sources such as an SNTP/NTP server, PTP leader, or GPS receiver. You can also manually
trigger a time synchronization message from your energy management system or configuration
software.
NOTE: To help maintain data integrity, some energy management systems impose a blackout
rule where time synchronization messages near energy interval boundaries are ignored.
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9810 series - User manual
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