Testing device and testing fixtures used therein

A testing device to test a circuit board comprising a first connector, the testing device comprising:

• a connecting circuit board comprising a second connector electrically connected to the first connector;
• a mounting board fixed in an enclosure in which the testing device is installed, the mounting board comprising a plurality of mounting holes;
• a fixing board movably mounted on the mounting board, the fixing board comprising a base movable relative to the mounting board and a cover mounted on the base, the base comprising a plurality of stepped holes corresponding to the plurality of mounting holes of the mounting board, wherein the connecting circuit board is fixed in the fixing board;
• and
• a plurality of fastening members to mount the base on the mounting board, each of the plurality of fastening members comprising a sleeve, a receiving fastener, and a threaded fastener, wherein the sleeve is mounted in a corresponding stepped hole, and an outer diameter of the sleeve is less than a least inner diameter of the stepped hole, and wherein the sleeve is longer than a depth of a least hole of the stepped hole;
• wherein movement of the connecting circuit board relative to the mounting board allows movement of the second connector of the connecting circuit board relative to the first connector of the circuit board.