<![CDATA[Clock Synchronization (Class 8) Best Practices and Daylight Saving Time (DST) Transitions]]>Managing Real-Time Clock (RTC) Drift and DST Shifts

Accurate billing and load profile alignment require sub-second RTC synchronization across all grid nodes.

Time Synchronization Methods

  1. Method 1 (adjust_to_quarter): Rounds clock to nearest 15-minute boundary.
  2. Method 2 (adjust_to_measuring_period): Resets drift without corrupting profile integration windows.
  3. Method 3 (adjust_to_minute): Synchronizes seconds to zero.
  4. Method 4 (adjust_to_preset_time): Two-step synchronized broadcast to prevent network jitter.

Daylight Saving Time (DST) Configuration

  • daylight_savings_begin (Attribute 4): e.g. Last Sunday of March at 02:00:00.
  • daylight_savings_end (Attribute 5): e.g. Last Sunday of October at 03:00:00.
  • daylight_savings_deviation (Attribute 6): Typically +60 minutes.
  • daylight_savings_enabled (Attribute 7): Boolean true.

When DST shifts back 1 hour, ensure your HES profile collector handles the duplicate hour timestamp by checking Clock Status bit 7 (daylight_saving_active)!

]]>https://dlms.sharur.org/topic/43/clock-synchronization-class-8-best-practices-and-daylight-saving-time-dst-transitionsRSS for NodeFri, 16 Oct 2026 19:49:49 GMTSat, 22 Aug 2026 12:37:59 GMT60<![CDATA[Reply to Clock Synchronization (Class 8) Best Practices and Daylight Saving Time (DST) Transitions on Sat, 22 Aug 2026 12:38:11 GMT]]>Never execute adjust_to_minute directly during an active 15-minute load profile integration period, as this causes duplicate or missing interval records in Class 7 buffers.

]]>https://dlms.sharur.org/post/106https://dlms.sharur.org/post/106Sat, 22 Aug 2026 12:38:11 GMT<![CDATA[Reply to Clock Synchronization (Class 8) Best Practices and Daylight Saving Time (DST) Transitions on Sat, 22 Aug 2026 12:38:10 GMT]]>In the meter hardware RTC, temperature-compensated crystal oscillators (TCXO) achieve $\pm 2\text{ ppm}$ accuracy (less than 1 minute drift per year even across $-40^\circ\text{C}$ to $+85^\circ\text{C}$ industrial temperature ranges).

]]>https://dlms.sharur.org/post/105https://dlms.sharur.org/post/105Sat, 22 Aug 2026 12:38:10 GMT