Does the high-frequency inverter power supply company comply with local labor laws? Does the factory meet ISO9001 and SA8000 standards?

Facilities: Manufacturing, testing, packaging, and loading areas

Processes: Lead time estimation, document control, and procurement systems

Management: Credential and workflow systems

Social Responsibility: Child labor, working hours, and wages: Does the company possess all documents requested by your legal counsel or as required by you?

Export License

Testing certification

Industry standards

MNC certification (if applicable): Conduct an in-person factory visit.

Spend more time at the production site

Bring your interpreter and visit as many sites as possible

What is the current status?

– Capacity

– Financials

– Workforce

- Determine

The factory's busiest periods and whether they conflict with your schedule

How much of their production is subcontracted

How they control IP and non-conforming products

– Inspect workflow system efficiency and verify actual implementation

– Test your power inverter supplier's understanding of your product requirements. Request samples shipped to you per exact specifications (pay if necessary)

– Evaluate the factory's quality system.

Before production begins, has the factory clearly documented all required characteristics for power inverters?

Are measurement methods for each characteristic explicitly defined?

Do production and quality control personnel have access to approved samples?

How does the power inverter factory evaluate and select material suppliers?

Are requirements accurately communicated to material suppliers?

Are purchased power inverters inspected for compliance? How?

Are power inverter samples sent for laboratory testing? How frequently?

Are materials stored properly?

Does the power inverter factory establish clear procedures for each worker and each task (including quality control personnel)?

How is it verified that each production process achieves the intended results?

Is in-process quality control performed? On what percentage of products? How is data collected in this manner handled (corrective/preventive actions?)? How are parts found to be defective handled?

How is it ensured that measuring instruments are available and used correctly?

Do operators control their own work? Do they receive regular training?

Are materials delivered directly to subcontractors? How do they inspect?

How does the power inverter factory control subcontractor work?

What inspections does it perform on subcontractor operations?

What percentage of products is inspected? How do they inspect? Does it include packaging?

Is final inspection conducted based on AQL statistics? Based on what QAL level?

What happens when nonconformities are detected?