Siemens 9810 Series, User Manual, Page: 174 / 218

Time and timekeeping
Time and timekeeping
Time 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 timezone and daylight savings time. You can configure and view
your meter’s date and time information through software such as ION Setup or
through the meter 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)
Master.
Go to www.usa.siemens.com/pds and download the Time synchronization and
timekeeping technical note for more information about time formats and settings
and the ION Reference for a detailed description of the Clock module and its
operation.
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 Master 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.
Supported time synchronization sources
Several time synchronization sources are available to your meter.
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