An ESD-protective shipping bag does not establish that an assembly was handled under suitable controls before packing. Review the actual path of an exposed board: receiving, inspection, staging, assembly, test, repair and return to protective packaging.
This guide focuses on ESD controls inside the handling and manufacturing route. The separate export-packaging guide addresses shipment protection and receiving evidence. Link the two plans at the point where packaging is opened or closed.
1. Start with the program and the product sensitivity
The EOS/ESD Association describes ANSI/ESD S20.20 as providing administrative and technical requirements for an ESD control program. A workstation photograph or the presence of a wrist strap is not equivalent to reviewing that program's implementation.
Ask which products, operations and locations the supplier's plan covers. Identify the relevant device or assembly sensitivity information and how the control plan addresses it. Request the applicable program revision, responsible owner, training arrangements and compliance-verification plan. If a certification is offered, verify its actual entity, site, scope and status separately; this checklist does not assert that any supplier or website operator holds one.
2. Walk the board through every exposure boundary
Draw the route from the unopened incoming container to the next controlled enclosure or package. Include temporary operations that may be absent from the nominal process flow: taking a photograph, scanning a label, moving a rejected board, attaching a test cable, changing a tray and performing an engineering measurement.
On small screens, scroll the table sideways to compare columns.
| Transition | Observation to make | Record or decision to request |
|---|---|---|
| Container opened | Where is the first exposed assembly handled? | Applicable protected-area procedure and permitted packaging-removal point |
| Operator handles a board | Which personnel controls apply to the actual task? | Verification method, required status and failed-check response |
| Board placed in a fixture | Do fixture surfaces, probes, cables and nearby materials fit the control plan? | Fixture assessment and approved operating configuration |
| Board waits or moves | Is protection maintained during queues and transport? | Approved carriers, exposure rules and route boundaries |
| Board sent for repair | Does the repair location use the applicable controls? | Repair-route authorization and verification records |
Record the real operation rather than assuming that every activity inside the factory has the same controls. A protected workstation may still hand a board to an unreviewed temporary desk or cart.
3. Review grounding, materials and essential insulators together
The Association's basic control guidance discusses grounding, personnel controls, materials and ionization. Its program overview distinguishes conductive items, which can be bonded or grounded appropriately, from process-essential insulators that require a different control approach.
Use that distinction when asking about a real station. Review the personnel system, work surface, tools, fixture, packaging and necessary insulating items as a configuration. Where ionization is part of the approved plan, ask how its suitability and performance are verified for the task. Humidity or an “antistatic” label should not be used as a substitute for the defined controls and their verification.
ESD arrangements must also respect electrical safety. Use equipment and procedures approved for the task by the responsible ESD and electrical-safety owners. Do not improvise grounding connections or assume that a personnel grounding method is appropriate around every energized test setup.
4. Check the verification record behind the equipment
For each control element, ask for the applicable requirement, measurement or monitoring method, equipment identity, verification interval, latest result and failure response. The values and intervals should come from the approved plan and applicable requirements, not from a universal table copied into a buyer's checklist.
- Can the record be connected to the actual station or device in use?
- Does it show the required status at the relevant time, rather than only a recent passing result?
- Are verification instruments suitable and maintained under the applicable measurement-control process?
- Does the failed-check procedure identify who stops work, assesses exposure and authorizes restart?
- Are temporary stations, moved fixtures and repaired equipment included when the configuration changes?
A photograph proves only what is visible in that photograph. A current passing result can support readiness for future work, but it does not by itself resolve the status of assemblies handled during an earlier unverified interval.
5. Handle an interrupted verification without inventing a defect rate
Hypothetical teaching example: a station's required check is found missing after 80 assemblies have passed through it. The next check passes. That result does not establish the control status during the missing interval, and it does not prove that any particular assembly was damaged.
Identify the actual exposure window, stations, material movements and affected population from available records. Keep the uncertainty explicit. Follow the authorized hold and assessment process, determine what evidence or investigation is appropriate, and record the disposition owner. Avoid either automatically scrapping all 80 boards or releasing them solely because a subsequent functional test passes.
The traceability guide helps define the population that records can support. The RMA investigation guide covers preserving evidence if an actual failure is being investigated.
6. Ask for a review packet tied to the proposed route
For a supplier review, request the controlled route map, applicable program scope, representative station configuration, training evidence, verification examples and an example of the failure-response workflow. Agree access and confidentiality arrangements without requesting unrelated employee or customer records.
During a pilot, observe the ordinary route and one relevant exception route, such as repair or off-line inspection. Record open actions with an owner and closure evidence. Revisit the assessment when exposed-board handling changes, rather than treating the initial audit as permanent permission for every future station.
ESD control questions
Is a wrist strap enough to approve a workstation?
No single visible item establishes the complete control arrangement. Review the task, applicable personnel system, work surface, tools, fixtures, materials, verification records and exception response together.
Does a passing functional test prove that ESD exposure was harmless?
It demonstrates the defined functional test result for that unit and configuration. It does not reconstruct an undocumented handling interval or by itself settle an ESD-related disposition.
Should the buyer prescribe one resistance limit for every station?
Use the applicable product requirements, invoked standards and approved ESD control plan to define the relevant controls and methods. This planning guide does not supply universal electrical limits.
Source scope: EOS/ESD Association references describe program and control principles. The route matrix and interrupted-check example are proposed review tools, not a facility certification audit or a diagnosis of damaged products.