Editing Automatic test equipment (section)

===VME eXtensions for Instrumentation (VXI)===
The [[VXI]] bus architecture is an open standard platform for automated test based on the [[VMEbus]]. Introduced in 1987, VXI uses all Eurocard form factors and adds trigger lines, a local bus, and other functions suited for measurement applications. VXI systems are based on a mainframe or chassis with up to 13 slots into which various VXI instrument modules can be installed.<ref>[http://www.interfacebus.com/Equipment_VXI_Chassis_Manufacturers.html Hardware Mechanical Components VXI Chassis and Case Manufacturers]. Retrieved December 30, 2009.</ref> The chassis also provides all the power supply and cooling requirements for the chassis and the instruments it contains. VXI bus modules are typically [[Rack unit|6U]] in height.