Approach To This Document IPC/WHMA-A can be used as a stand-alone document for purchasing products; however it does not specify frequency of. IPS/WHMA-A is an individual level certification based on a standard published by IPC titled “Requirements and Acceptance for Cable and Wire Harness. IPC/WHMA-A Requirements and Acceptance for Cable and Wire Harness Assemblies.
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If you have a reason to believe that testing will degrade your assembly, then you may want to perform some confirming tests and make use of a provision of the test section that requires electrical tests on good assemblies to not degrade reliability.
If the User and Manufacturer do not establish and document the acceptance class, the Manufacturer may do so. The Insulation Resistance test IR detects a more consistent current flow between insulated conductors, stated as a resistance, by factoring in the applied voltage.
Instructor certification and re-certification training is conducted primarily at IPC Authorized Training Centers but may be conducted by the training center at company facilities.
Program Benefits Certification demonstrates commitment to customer requirements and greatly facilitates certification to ISO Certification or other quality assurance initiatives. Typically, the end-use environment would not cause failures. Translated Training Materials Translated training materials for this program are available.
We are not aware of any research or proof that the insulation used in good assemblies can be degraded by high voltage during brief applications in the IR and DWV tests. Certification demonstrates commitment to customer requirements and greatly facilitates certification to ISO Certification or other quality assurance initiatives. Will these test voltages damage them?
IPC-WHMA-A Training and Certification | IPC
The slides are intended to be used with revision 6 of the Policy and Procedures document. This means that the measured resistance starts lower and trends higher over time.
Longer times have better chances of detecting faults. It is true that smaller gaps between isolated conductors result in lower breakdown voltages. However, the need for a good HV test increases as the spacing gets smaller.
These are rather small creepage distances. Includes products where continued performance or performance-on-demand is critical, equipment downtime cannot be tolerated, ipc/whmaa–620a environment may be uncommonly harsh, and the equipment must function when required, such as life support systems and other critical systems. Printing a test copy on a blank piece of paper first. In Class 2, just as in Class 3, small creepage distances can justify a reduction in the voltage applied for the high voltage test.
You can purchase the current version A Rev B at whma. Certified IPC Trainers will participate in a week-long program that ipc/whmq-a-620a 29 instructional hours. Space addendum for C course materials are available! To use the files:.
Blackfox IPC/WHMA A-620 WITH HANDS-ON CIT
More than 20, A Application Specialists have been trained. Then the CIS candidate would complete only the portion of the hands-on project that applies to the learned material. Classes of products are defined and include criteria for Target, Acceptable, Process Indicator and Defect conditions to support the collection of visual quality acceptability requirements for each class.
I have insulated wires or connectors with a specified maximum working voltage that is lower than those required in the A test specification.
The longer you apply the voltage, the better the final measured insulation resistance, so longer times allow cables with worse IR ipc/whma-aa-620a to pass.
IPC/WHMA A WITH HANDS-ON CIT –
Click here for more information. This seems backwards since the closer the spacing, the lower the voltage a connector is likely to be able to withstand. To shorten ipc//whma-a-620a test time without degrading the test, the IR test time ends as soon as the minimum resistance value is reached. These files are being made available to update existing training PowerPoints in each of the indicated courses with typographical and other editorial corrections for each course.
The costs of the testing should not increase when the voltage needs to be reduced.
IPC/WHMA-A-620 Certification Definition
Am I caught in a double bind where these required test voltages are considered destructive and render the assembly unusable for service? This test must continue for some minimum time. Conductive connector shells and unused contact positions shall be included where a risk of a short exists.