The 4-probe dipper is device which may be used to perform 4-probe resistance measurements on metallic samples for temperatures down to 4 K. It basically consists of a copper stage to which a sample may be attached. Four, spring-loaded, pressure contacts are used to connect wires to the sample. The wires pass through a long, stainless-steel tube to a junction box at the end of the dipper. The copper stage also has a diode temperature sensor attached to it for monitoring sample temperature.
This device was fabricated by O. C. student Joe Peidle for use in performing 4-probe resistance measurements on YBCO thin-film samples. Lock-in amplifiers are used to measure the current and voltage. The results are graphed with an X-Y plotter in the equipment rack above the lock-in amplifiers.