Patent ID: 7786721

Claim:
A multilayer test board assembly for high-precision inspection, comprising: a plurality of test boards separated from each other according to their functions, having input/output signal terminals, and including at least one test board each having a first section where first mounting devices sensitive to an influence of electrical signals are mounted and a second section where second mounting devices insensitive to an influence of electrical signals are mounted; spacers that arrange the test boards in parallel by spacing apart the test boards at predetermined intervals; connection cables connected to the input/output signal terminals of the test boards; and a signal shielding fence formed on each of the at least one test board so as to protect the first mounting devices from electrical signals generated by the second mounting devices, wherein the signal shielding fence has a height that is lower than a height of the spacers, wherein a ground line is formed on each of the at least one test board, wherein the signal shielding fence is connected to the ground line, and wherein the signal shielding fence has a closed circuit shape surrounding any one of the first section and the second section.