Carrier quality appraisal

carrier machine takes high-frequency signal modulation and power line channel adaptation as its core principles. By optimizing carrier frequency stability, output power accuracy and anti-interference ability, it achieves reliable transmission of power line communications, collaboration of remote meter reading and power grid status monitoring, and is widely used in smart grids, distribution network automation, industrial control and remote metering. In smart meters, it is used for real-time backhaul of power consumption data; in distribution network systems, it meets millisecond-level response requirements for fault location and isolation; in industrial scenarios, it ensures reliable transmission of equipment group control instructions. Compared with traditional communication equipment, carrier machines have the characteristics of high channel utilization efficiency, strong environmental adaptability, and convenient installation. They are the core communication nodes in the construction of the power Internet of Things.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide carrier machine quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for carrier machine quality appraisal.

With the large-scale deployment of the power Internet of Things, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: the actual transmission distance does not meet the standard, signal modulation error;

2, material defects: the thermal resistance of the power amplifier module GaAs chip exceeds the standard, and the coupling transformer Device core loss;

3, process problems: PCB high-frequency impedance mismatch, filter out-of-band suppression is insufficient;

4, contract performance dispute: communication protocol version, core chip model does not match the technical agreement.

carrier machines usually uses the following technical methods:

1. Functional testing: Evaluate the basic functions of the carrier machine, including modulation, demodulation and signal transmission capabilities.

2. Performance test: Measure various performance indicators of the carrier machine, such as spectrum purity, power output and receiving sensitivity.

3. Environmental test: simulate actual usage conditions and evaluate the performance of the carrier machine under different temperatures, humidity and vibration.

4. Disassembly inspection: disassemble the carrier machine and check whether there are defects in internal components, circuits and assembly processes.

A power grid company of the applicant signed a "Low Voltage Carrier Machine Procurement Contract" with an equipment vendor of the respondent, agreeing that the transmission distance is ≥3km. After deployment, the communication interruption rate exceeded 20%, and the manufacturer argued that it was caused by harmonic interference from the power grid.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "carrier", contract technical agreement, on-site investigation case materials and other data, and made the following quality analysis opinions:

The appraisal conclusion concluded that hardware performance defects are the main cause of communication failure.

The carrier machine quality appraisal report should include:

1, appraisal purpose and cited standards;

2, specifications involved, production batch number, construction record;

3, detection method and Equipment list;

4, test data and failure correlation analysis;