A configurable feedback path is included in an amplitude control system having a signal source and an amplitude controller, and provides accurate tracking between a signal provided at a test port and a reference signal, whether or not the configurable feedback path is in an internally-leveled configuration or an externally-leveled configuration. The latches are guided by the first fitting part by guides which are guided in the radial direction relative to the axis, and the eccentric acts to move the latches radially outward. The adapter includes a light collecting and magnifying barrel having a reflective inner surface and a magnifying lens and is secured with the end of the penlight encasing the LED. The base and component door define a sealed compartment when the component door is in the closed position. The method includes exposing the dielectric material layer to a plasma comprising a hydrocarbon gas and a halogen containing gas. The analog integrated circuit and the circuits to trim the analog integrated circuit may be included in a same package.