  Using the integral equations of the Noncrossing Approximation, the
differential conductance is computed as a function of voltage for scattering
from a two channel Kondo impurity in a point contact. The results compare well
to experimental data on Cu point contacts by Ralph and Buhrman. They support a
recently proposed scaling hypothesis, and also show finite temperature
corrections to scaling in agreement with experiment. The conductance signal is
predicted to be asymmetric in the bias when the impurity is not equally coupled
to left and right moving electrons.
