Sunday, October 1, 2023

DV testing and PV testing difference

Difference between DV testing and PV testing

DV testing & PV testing are part of validation testing. Various Validation testing- Engineering development, Design verification, Product validation, continuous compliance test (CCT). These are also test stages-First ED then DV & PV in last CCT.

Here in this article you will learn about basic difference between DV test and PV test widely used in automobile industries. Since validation and verification has now became necessary for product development in almost all industries-including medical, service and IT industries. 

DV testing VS PV testing

Before going in details we have to understand basic difference two terminology which is used in this article-Verification and Validation

Difference between Verification and Validation

Verification means the evaluation whether the product has been designed and produced according to the specifications, drawings, regulations, instructions. An exercise on paper that checks if the design is developed according to, and complies with standards, governmental regulations, industry-specific regulations, customer requirements. In addition it analyses if the design outputs met the design input requirements.

Validation mean the evaluation whether the product is working according to the specifications, drawings, regulations, instructions. A physical test of the product that validates, if the design of the product itself is capable of meeting design requirements.

Validation Vs Verification

Now lets understand DV test and PV test

DV testing stand for design verification testing. While PV testing is Part validation testing.

Purpose of DV testing is to validate product design meet established requirements. DV testing is physical testing of pre-production or production part. 

DV testing is done as per DV test plan (DVP).  For preparing DV test plan, we need input like- Customer drawing, specification mentioned in drawing or any warranty issue mentioned. So DV testing report may include customer designated symbol and terminology. 

This is intensive testing program verifying all product specification, standards, and customer requirements. It consist following testing area:-

  1. Functional testing
  2. Performance testing
  3. Environment testing
  4. Durability testing
  5. Mechanical testing
  6. Conformance testing
  7. Safety certification testing

PV testing is product validation testing. Purpose of PV testing is to verify the product produced from production process and tools meet the requirement. PV testing is physical testing of production part.

For PV testing input will be PPAP functional requirements.

Difference between DV test and PV test

What are PPAP functional requirements for PV testing? 

Final drawing, Mass production level part, Tool up part, required production rate achieved, all ECN should be implemented.

Who is responsible for DV test?

Product design engineer is responsible for DV test and its integrity. Head of product engineer is responsible for DV test approval. Lab in charge is responsible for physical test and test report preparation.

In each validation testing we need to add acceptance criteria, target requirement and Sample level.

There are 4 sample level used in DV testing

  • A = Prototype (Handmade)- Parts may be modifications of existing products or built from scratch. 
  • B = Prototype (Tooled), Samples released for design verification, made from prototype tools, and are Design-intent.
  • C = Production Tool (Not Process) 
  • D = Production Tool and Process

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