Voltage regulators are exposed to extreme amounts of voltage over short periods of time during an electrostatic discharge event. The security evaluation unit can be mechanically coupled to the connection module so that an electrically conductive connection is produced between the first and second interfaces. The peristaltic pump assembly further includes a regulator disposed in the pump body and operatively connected to the cassette, where the regulator is configured to regulate the predetermined force applied to the tube. The test access ports on an integrated circuit can be arranged in a hierarchy with one test linking module controlling access to plural secondary test linking modules and test access ports.