“Tweakers” are an economical test fixture design technique that allow test operators to manipulate PCBA components during functional test. The black tweaker seen in this fixture photograph is used by the operator to press down and activate a push button during the functional test. Tweakers can be used in a lever fashion to manipulate DIP switches. They are also used in a rotary fashion to adjust potentiometers, variable capacitors / inductors, and rotary switches. A more automated solution to PCBA testing is to use pneumatic actuation or solenoid actuation to pressing, rotating, or sliding PCB components during functional test (FCT) or in-circuit test (ICT).
