Lampholder with measuring contacts - allows use of lamps with different base dimensions by inclusion of hinged measuring contacts

The lamp holder is contained in a rectangular metallic box (1). The incoming supply lead (3) is routed (3a, 3b) to the contacts which receive the lamp connector pins. The measuring contacts (7) are connected (4a, 4b) to the voltage measuring output lead (4). The measuring contacts are hinged and can typically be moved by turning a knob (12) driving an eccentric. The contacts can thus be brought against the lamp connector pins to make a measurement. These adjustable contacts permit he use of a variety of lamps.