A clearly arranged LCD Display offers a view of all necessary parameters, such as measured values, limit values, etc.. With only one control button all functions are adjustable via an easy menu selection. The Control System can handle one or more units. Standard is the integrated Centronics Interface to which a printer can be used without any special software. All measured values can be transferred to another computer via RS232 Interface. If using more than one test unit the control system also offers in standard a fully automatic test procedure. The complete switching from High Voltage Test to PE-Conductor Test to Insulation Test and to Leakage Current Test is realized by the built in special high voltage relay matrix.