The 70001A System Mainframe is a 8-slot mainframe for 70000 Modular Measurement System (MMS) plug-in modules. It provides cooling, power, digital communication interface buses (MSIB and HP-IB). It is compatible with standard EIA racks. Good EMC performance and rugged structural design make it suitable for sensitive measurements in tough industrial environments.  It has an optional 400Hz power line operation.