Small test adapter based on direct connecting of plug and printed board

The utility model discloses a small test adapter based on direct connecting of a plug and a printed board. The small test adapter comprises a signal conditioning plate. Sockets of a plurality of internal interfaces of a test system, and corresponding sockets of a plurality of external interfaces of a detected unit are directly welded on the signal conditioning plate, sockets corresponding to a plurality of internal interfaces form internal aviation plugs on the signal conditioning plate, and sockets corresponding to a plurality of external interfaces form external aviation plugs on the signal conditioning plate. Since sockets of a plurality of internal interfaces of a test system, and corresponding sockets of a plurality of external interfaces of a detected unit are directly welded on the signal conditioning plate, and the internal interfaces of the test system and the external interfaces of the detected unit can be directly connected with the sockets on the printed board of the adapter to realize signal conditioning and switching between the test system and the detected unit. The adapter is simple in structure, small in size and convenient for maintenance, and is unlikely to cause signal interference.