Two factories can hold the same certificate and behave differently on the second order. One can show what it measured last month, which limit it compared against and who signed it; the other can show the certificate. The difference appears in a short conversation about four decisions, and none of them requires a factory visit to establish.
Charger factory quality: the decisions that separate two suppliers
Four decisions reveal how a factory controls quality: what it measures and how often, who owns the limit, which records travel with the shipment, and how a failure is contained.
Each has a documentary answer, which is convenient, because the answers can be compared between suppliers before an order is placed. Together they describe a process rather than a capability, and a process is what a second order depends on.
The certificate question is deliberately absent. A system certificate describes the factory’s arrangements; the four decisions describe what happened to your product, which is the question a buyer is actually asking.
Decision 1: what the factory measures, and how often
Ask for the measurement plan for this product, not for quality in general.
The plan should name the parameters, the instrument, the frequency and the person responsible: output behaviour on every unit, thermal behaviour on a sample per build, incoming verification for the critical components per lot, and the finish inspected against a retained reference. A factory that answers with a description of its equipment is describing capacity, and one that answers with a schedule is describing control.
Decision 2: who owns the limit
A limit has an author, and knowing who it is explains most disputes.
Where the limit came from the buyer’s specification, the ownership is clear and both sides measure against the same number. Where it came from the line’s own history, it will drift as the line’s habits drift, and it will differ from the buyer’s expectation without anyone deciding it should. Ask for the source of the limit on the parameters that matter most, and record the answer in the criteria document.
Decision 3: the records that travel with the shipment
The record is the part of quality control that survives the factory.
Ask which records accompany the shipment and in what form: per-unit test results, the incoming verification records for critical components, the aging results, and the packaging test report for the revision being shipped. Where the answer is a summary report, ask for a sample of the underlying data, because a summary cannot be traced when a complaint arrives from one market and not another.
Decision 4: how a failure is contained
The response to a failure is more informative than the failure rate.
A containment process covers the quarantine of the affected units and of the same lot still on the line, the identification of the cause, the decision on rework or replacement, and the change that prevents recurrence. Ask what happened the last time a batch failed a limit, and ask for the record of that event: a factory that can describe a specific case with dates and outcomes is describing a process that has run, not one that exists on paper.
| Decision | What to ask | Evidence of control | What a weak answer looks like |
|---|---|---|---|
| What is measured | The measurement plan for this product | Parameters, instruments, frequency, owner | A description of the equipment |
| Who owns the limit | The source of the limit for key parameters | The criteria document signed by both sides | A limit from the line’s own history |
| Records | Which records travel with the shipment | Sample of the underlying per-unit data | A summary report with no raw data |
| Failure containment | What happened the last time a batch failed | A dated record with a cause and a change | A general procedure |
The audit question that reveals the most
Ask to see the last batch’s raw data, then ask what changed because of it.
The first request shows whether per-unit or per-lot data exists and whether it is retained past the shipment. The second shows whether the data is used. A factory that has never changed a limit, a fixture or a process because of its own measurements is collecting records rather than controlling quality, and the records will not protect the buyer when a question arrives.
Where quality programmes lose their effect after the first order
Three patterns, and all three appear on the second order.
The criteria are renegotiated because the first set was never written down; the sampling drifts to whichever point in the shift is convenient; and the retained reference is lost or worn so the finish standard becomes subjective. Each is prevented by treating the criteria document, the sampling plan and the reference samples as part of the product rather than as part of the project.
FAQ
Do we need to visit the factory to judge quality?
A visit helps, and the four decisions can be established in writing. Asking for the measurement plan, the source of the limits, the shipment records and a specific containment record gives a comparable picture without travel, and it can be repeated for each supplier. Ask for the measurement plan, the source of the limits, the shipment records and a specific containment record, because those four give a comparable picture without travel.
Does an ISO certificate tell us anything?
It indicates that the factory operates a documented system, which is useful context. It does not describe what was measured on your product, which is why the four decisions above are asked in addition rather than instead. A certificate indicates a documented system, which is context, but it does not describe what was measured on your product or with which limits.
What if the factory refuses to share raw test data?
That is an answer in itself. The data belongs to the product being bought, and a supplier unwilling to share it leaves the buyer without the ability to trace a complaint, which is a commercial risk rather than a technical preference. The data belongs to the product being bought, and a supplier unwilling to share it leaves the buyer unable to trace a complaint.
How often should the criteria be reviewed?
At the start of a new product, at a change of component or factory, and whenever a defect pattern appears. A criteria document reviewed only when it is disputed is a document that no longer describes the product. Review the criteria at the start of a new product, at a change of component or factory, and whenever a defect pattern appears.
Next step
Send the specification and the parameters that matter to your channel to Wecent Group through the contact page. The reply provides the measurement plan, the source of each limit, the records that travel with the shipment and an example of a containment record. Related reading: the factory floor, OEM and ODM charger manufacturing and charger manufacturing services. External references: IEC standards, IEC Webstore, UL standards and certification, TUV testing services, Intertek testing services and IQNet certification network.
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