Solid state power controllers are described that include a switch controlled by a microcontroller and communication contacts. A gantry-like configuration is employed for precise movement of birefringence measurement system components relative to the sample. The method includes determining, by the computing system, using at least the recorded concrete values and source-sink pairs whether information leakage meeting one or more quantitative criteria occurs by the program. When the switch is open, the fourth power supply unit supplies a small current between the main electrode and the nozzle electrode while forming a pilot arc between them. The body is sized such that the distal end of the body is disposed within the pharynx above the epiglottis. In one embodiment of the invention, a method for e2e SLA compliance across both managed and unmanaged network segments can be provided.