CNAS Accredited Laboratory

CNAS-Accredited Energy Meter Testing Laboratory

The Experiment Center of Zhejiang Yongtailong Electronic Co., Ltd. is accredited by CNAS in accordance with ISO/IEC 17025:2017.

The laboratory supports energy meter development, verification and production quality control through metering-performance, electrical, environmental, communication, EMC-related and reliability testing.

CNAS scope must be confirmed by current accredited scope

View Testing Capability

CNAS L12672 Registration number

ISO/IEC 17025 Accreditation criteria

2025-2031 Current validity period

YTL CNAS-accredited energy meter testing laboratory

Accreditation Summary

CNAS Accreditation Information

Accredited laboratory	Experiment Center of Zhejiang Yongtailong Electronic Co., Ltd.
Legal entity	Zhejiang Yongtailong Electronic Co., Ltd.
CNAS registration number	CNAS L12672
Accreditation criteria	ISO/IEC 17025:2017 and CNAS-CL01
Effective date	16 October 2025
Expiry date	15 October 2031
Accredited address	No. 320, Tongsheng Road, Fengming Subdistrict, Tongxiang, Zhejiang, China

Testing Capabilities

Energy Meter Verification Capabilities

Metering Accuracy

Verification under defined voltage, current, load and power-factor conditions.

Active and reactive energy accuracy
Voltage and current measurement
Power and power-factor verification
Starting current and no-load condition
Meter constant verification

EMC Verification

EMC verification for applicable meter designs based on relevant standards.

Electrostatic discharge
Electrical fast transient
Surge and RF immunity
Conducted disturbances
Voltage dips and interruptions

Environmental Testing

Environmental verification for operating, storage and durability conditions.

High and low temperature
Damp heat and humidity
Temperature cycling
Storage-condition verification

Communication Verification

Interface and protocol verification for selected meter models and integration requirements.

RS485 and Modbus RTU
DLMS/COSEM and M-Bus
Pulse output and register access
Controller and platform integration checks

Reliability and Durability

Long-term performance checks for product reliability and stable operation.

Long-duration operation
Power cycling
Relay endurance
Display and key operation
Aging verification

Electrical Safety and Protection

Electrical safety verification based on actual laboratory capability and project requirements.

Insulation resistance
Dielectric strength
Impulse voltage
Terminal temperature rise
Clearance and creepage checks

Laboratory Equipment

Laboratory Equipment and Test Systems

Energy Meter Calibration Benches

Multi-position calibration benches for voltage, current, power factor and energy measurement verification.

Test objects: AC / DC energy metersScope status: Confirm by accredited scope

EMC Test Systems

Equipment for applicable immunity, surge, transient and disturbance verification.

Test objects: Meter designs and assembliesScope status: Confirm by accredited scope

Environmental Chambers

Temperature and humidity chambers for operating, storage and environmental verification.

Test objects: Finished meters and componentsScope status: Confirm by accredited scope

Electrical Safety Equipment

Equipment for insulation, dielectric strength, impulse voltage and related safety checks.

Test objects: Meters, terminals and enclosuresScope status: Confirm by accredited scope

Communication Test Platforms

Test platforms for RS485, Modbus, DLMS/COSEM and project-specific communication verification.

Test objects: Smart meters and terminalsScope status: Engineering capability

Reliability Test Systems

Aging, endurance, power-cycle and long-duration operation verification systems.

Test objects: Meter products and modulesScope status: Confirm by project

Standards and Methods

Standards, Methods and Verification Frameworks

Test Standards and Methods

Specific standards and methods used for product design, testing or project references.

IEC 62052 series
IEC 62053 series
EN 50470 series
IEC 61000-4 series
Other actual accredited standards

Regulatory and Market Frameworks

Frameworks that may require supporting product verification or technical documentation.

MID
Applicable CE conformity requirements
RoHS
Market-specific documentation support

Protocols and Industry Schemes

Communication and industry schemes supported for selected product and project requirements.

DLMS/COSEM
STS
Modbus
M-Bus
Other supported protocols

The standards, methods and schemes shown on this page do not imply that every product or test item is included in the CNAS-accredited scope. Applicable standards and capability status must be confirmed by model and project.

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