After the development stage, it is time for pilot-run verification tests and mass production. Pilot-run verification tests include:
An EVT is performed on the first PCBA (Printed Circuit Board Assembly) to ensure that basic designs meet requirements and specifications, including basic hardware functions, RF performance, RF interference, and power consumption. The EVT process may iterate as many times as required to identify and fix all the issues.
A DVT is performed on the whole product to ensure that the product meets requirements and specifications before moving towards mass production. DVT includes high/low temperature test, electrostatic discharge (ESD) test, and drop test.
Once the product passes EVT and DVT, a prototype can be prepared for national or alliance certifications, such as SRRC, FCC, CE, etc.
After trial production, the product is ready for mass production. Mass production involves many stages, such as material preparation, mounting, burning, testing, packaging, etc. This chapter only focuses on two stages that are closely related to Espressif's products – firmware burning and product testing.