The VT stage is the time we bring a prototype into mass production. It often involves several rounds of trial production to work out and optimize the manufacturing procedure. Engineers are progressively pulled out from the production line.
In the preparation phase, engineers make drafts for the production procedure base on the process of making prototype. The initial version of the Standard Operation Procedure (SOP) and Standard Inspection Procedure (SIP) are presented as the start point of iteration.
The first round of iteration is called Engineering Validation Test (EVT). Our engineers work with the factory operators to build 50 to 100 units to transfer the product design on the engineering level. The engineering issues that need to be altered are identified in this phase.
Design Validation Test (DVT) is the second iteration. We set up a real production line and build 300 to 500 units. The aim of DVT is to make a consensus golden sample, a sample product satisfying all the function, reliability and cosmetic standards. The regulatory test is performed at this stage. Mass production yields are monitored. Process failure effects are analyzed to improve yield.
In the Production Validation Test (PVT) phase, we confirm the production process by building 500 to 1000 sellable units. The process is continuously optimized to reach a yield of 95% or higher.
Product development is an iterative process. Even the best design for manufacture cannot be mounted to the factory without months of pilot production. Our engineers closely cooperate with the factory to ensure fast diagnose and quick response to the production problems.