Abstract: A defeatable room access control system and method having: 1) an electronic mortise lockset limiting access to a protected room; 2) an authorized user detection scheme controlling the lockset; 3) a door interlock mechanism confirming the closure status of the door; 4) an ability to override the door interlock mechanism when an authorized user is detected. 5) one or more microprocessors programmed to monitor and control all functions.

Abstract: A vacuum system comprising: 1) an ion pump; 2) power supply; 3) a high voltage DC—DC converter drawing power from the power supply and powering the vacuum pump; 4) a feedback network comprising an ammeter circuit including an operational amplifier and a series of relay controlled scaling resistors of different resistance for detecting circuit feedback; 5) an optional power block section intermediate the power supply and the high voltage DC—DC converter; and 6) a microprocessor receiving feedback information from the feedback network, controlling which of the scaling resistors should be in the circuit and manipulating data from the feedback network to provide accurate vacuum measurement to an operator.