For critical applications requiring reliability of the highest order, and where regulation performance must be within tight boundaries we offer LINEAR power supplies. There is the added advantage of low noise (even without psophometric weighting) which more than compensates for the larger volume of the unit.                       For larger DC power supply systems added availability can be achieved by making up the system of parallel modules. If the total load current is "y" which would require "n" modules of rating y/n, we supply n+1 modules so that one module may be removed without deteriorating the system integrity. These systems are normally supplied in free standing cubicles.                       We design and manufacture small power supply systems which provide in one unit all of the separate sources required to do Ion Assisted Deposition of thin film in both Optical applications and Hard Coating of metals, with the requisite system linking and interaction. Electron Beam power sources will also be quoted.                   A requirement of critical loads whether for Communications or Industrial Instrumentation is to "Back-Up" the DC supply with batteries in the event of mains failure. We supply these systems complete with features such as regulated charging of the battery, alarms for all important parameters and controlled sharing of load current in a multi-module system. Separate regulation of the battery charging current assures no interruption to, or downgrading of, the system load current.