A stencil device ensures that solder paste is accurately applied to a printed circuit board to create a substantially zero signal degradation solder bridge electrical connection. First, two metal plates, clamped with first and second clamping devices, are placed to overlap each other at their end portions. Each of the test scenarios may include at least one test case. A program voltage signal is applied to a selected word line in order to program storage elements connected to the selected word line. Thus, it not only saves resource waste but also conserves economical expense incurred by frequent replacement of the shower head shell. If the length of a block to be processed, included in the payload, is less than a predetermined value, the idle data inserting unit appends idle data following the block and transmits the frame including the block padded with the idle data to the encrypting unit.