  Dedicated read-out electronics was developed for low impedance resistive
thermometers. Using this high performance temperature controller, the
temperature dependence of the excess noise of a YBa2Cu307-d (YBCO) sample in
the superconducting transition was monitored as a function of the current bias.
The noise could reach 3.10-8 K Hz-1/2 at 1 Hz, 5 mA bias and 90 K.
