PP 2 Tests Markus Keil Universit de Genve

PP 2 Tests Markus Keil Université de Genève Markus Keil, Service Test Meeting, 14 March 2007

Goal of the Measurements § Exercise Mauro’s power-up procedure for PP 2: – Compare the “unkill-power-up” and the “ramping-power-up”. – Check whether we can use this power up procedure to detect broken sense lines before applying the full voltage to the modules. § Draw conclusions for a possible revision of the FSM. § For the time being, use the service test setup to do survey a manually performed power-up procedure. PP 2 Tests 2

Power-up Procedure and Measurements § § § § Reset Trimmers to 0 Ramp Wiener voltage to VUp, set trimmers and inhibit states. Lower Wiener voltage to VLow Unkill board Measure output voltage at load Measure voltage with PP 2, current with PP 4 Repeat for different load currents, with and without sense Repeat for different VUp and VLow ® Check stability and margin for trimmer and inhibit setting in this powering scheme ® Check possibility to find broken sense PP 2 Tests 3

Power-up Comparison § Maybe interesting to compare the different power-up procedures before revision of the FSM. . . § Transient measurement at unkill (compare with ramping) – Load measurement would require external triggering / synchronisation – Oscilloscope measurement? § Compare duration of module high-current state at power-on for the two methods PP 2 Tests 4