Electricity Meter Time Calibration Methods

1. Local Manual Calibration

Applicable: Basic meters without communication modules

Steps:

Press and hold the "SET" button (admin access required)

Adjust time using ▲/▼ keys

Confirm and exit setup mode

*Note: Some models require physical key combinations (e.g., 3-button long press)*

2.Infrared/USB Calibration

Tools Required:

-IR handheld calibrator or USB-to-IR adapter

-Calibration software (e.g., *DL/T645 Protocol Debug Tool*)

Procedure:

a.Connect to the meter's IR interface (align with receiver window)

b.Send time sync command (Example: AA AA AA AA 68 11 04 33 33 34 33 16)

c.Verify clock error via software (±2s tolerance)

3. LoRaWAN/NB-IoT Remote Calibration

Precision:

Class B Beacon: ±1s

Class A Polling: ±5s

Forced Downlink: ±0.1s (with ACK)

4. GPS/BeiDou Synchronization

Requirements:

-Built-in GNSS module

-Automatic μs-level synchronization (common for substation meters)

Calibration Standards

Parameter Requirement Regulation

Basic meters ≤±5s/day Q/GDW 1205-2013

Time-of-use meters ≤±0.5s/day DL/T 698.45-2017

Event logging Keep records ≥3 years IEC 62056-21

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