A multipoint lock system for use with the active and inactive doors of two-door sets, which provides an operator with the ability to lock or unlock a plurality of locking points both manually and automatically, and features a blocking mechanism to prevent unwanted locking. Each sample tube receiving structure includes a bottom member adapted to receive a plurality of sample tubes and a top member having a plurality of aligned apertures sized to receive sample tubes therethrough. The filter 19 is situated within an outer cylindrical casing 4 on an axis perpendicular to the axis of the outer cylindrical casing 4. Then, all of the electronic component members contained in the first two-dimensional plan view are displayed in a second two-dimensional plan view, and a function selection menu is generated by an arithmetic process. The second module is configured to switch between tracking the first input signal and not tracking the second input signal during each half-cycle of the second input signal based on values of the first input signal, the second input signal, and a predetermined threshold of the second module.