Burst Test Test-Bed LHC120A-10V 4 Quadrant Converter: Burst Tests A converter is tested on all cables. Test specifically on “High Precision analog sensor cable” is done to show “Low Impedance 360° shielding” efficiency. Iout AC Mains Supply Power Part Voltage Source Vout A B Earth Circuit Vref I.A Control WorldFip - I ref - Digital Electronic Current Transducers I.B DCCT Cable 4kV E.U.T This cable is really critical since ensuring integrity of analog high precision measured current used in loop regulation. Analog value is digitalized in the Digital Electronic though a 16bit Sigma Delta ADC. Current loop is then numeric, and provides voltage reference to the power converter acting as a power amplifier. Burst Generator Rack is only connected to ground by AC cable Ground Copper Plane Immunity CEM RF & Hyper Europe 2008 1st October 2008 Y. Thurel

Burst Test Results @ 120A DC LHC120A-10V 4 Quadrant Converter: Burst Tests I.Meas (1kHz sampling) Burst Test Results @ 120A DC 4kV Burst OFF Result of Burst test with adequate connector shielding: 4kV impact is not measurable. 2 ppm 4kV Burst On A standard “queue de cochon” applied: shielding is degraded: 100ppm of error!!! Cable Shielding continuity to connector = 2 cm path 100 ppm 4kV Burst On Shielding not connected to connector is equal to “pig tail” case!!!! 100ppm of error!!! No Cable Shielding continuity with connector 600 ppm 4kV Burst On Immunity: Shielding Quality Impact CEM RF & Hyper Europe 2008 1st October 2008 Y. Thurel