What is Hand model in English?

English is Hand model: usually just R & D or design products need to do the hand plate, hand plate is the first step to verify the feasibility of the product is to find out the design of the product's defects, deficiencies, drawbacks of the most direct and effective way to improve the defects targeted until the individual hand plate samples can not be identified from the shortcomings of the samples. At this point, it is usually necessary to carry out a small batch of trial production to find out the shortcomings of the batch to improve. Designed to complete the product generally can not be done perfectly, and even can not be used, direct production once defective will be all scrapped, a great waste of manpower and material resources and time; while the board is generally a small number of samples, the production cycle is short, the loss of manpower and material resources, and very quickly find out the shortcomings of the product design and improve the product finalized for mass production to provide a sufficient basis for the product.