The OEDIPUS A rocket was successfully launched from the Andoya Rocket Range on January 30, 1989, toward a moderate auroral arc. In this experiment, the forward and the aft payloads constituted a tether. The forward and the aft payloads were connected through a thin isolated wire and the two subpayloads were used as a plasma diagnostic tool. Here we examine the results obtained in the current/voltage mode, when the two subpayloads act as a large double probe. In this mode, a voltage sweep from -8 V to +8 V was applied between the two payloads. The measured current/voltage characteristic has been fitted with a theoretical model of the current collected to extract the plasma parameters. The results indicate (1) a temporary contamination of the surface of the payload by the argon release system, (2) a moderate and reasonable electron temperature and (3) good correspondence with the results of the voltmeter for the measurement of the natural and induced electric fields. ¿American Geophysical Union 1991