@Test
  public final void testImpedance() {
    try {
      PhysicalParameters parameters = new PhysicalParameters(25., TemperatureType.C);

      double z0 = parameters.calcZ0(BaseRadius);

      Complex zLoad = Tube.calcZload(BaseFrequency, BaseRadius, parameters).divide(z0);
      assertEquals("Re(Z) incorrect", 0.00101768, zLoad.getReal(), 1.0e-6);
      assertEquals("Im(Z) incorrect", 0.039, zLoad.getImaginary(), 0.0001);

    } catch (Exception e) {
      fail(e.getMessage());
    }
  }