CARDIAC production tests G. Auriemma, M. Martino & C. Satriano

G. AuriemmaPRR FEB Roma 15/7/20052 Objectives Prepare an “ user friendly ” automatic test bench to be used at the Cardiac production site Check functionality of the boards Operate a quality selection of FEB (if necessary) Generate a database for setup & future reference

G. AuriemmaPRR FEB Roma 15/7/20053 Type of tests which can be performed Check of the current absorption Check of the connectivity from the signal inputs to the LVDS digital output Measurement of sensitivity, noise and bias at different Cdet Measurement of the time jitter Check of the functionality of the on board test system

G. AuriemmaPRR FEB Roma 15/7/20054 Schematic of the test bench

G. AuriemmaPRR FEB Roma 15/7/20055 The test bench

G. AuriemmaPRR FEB Roma 15/7/20056 The injector

G. AuriemmaPRR FEB Roma 15/7/20057 A sample S-curve Raw data are obtained as S-curves at fixed threshold The value of the Q V th is evaluated by a gaussian fit of this curve Noise is evaluated from the variance of the gaussian

G. AuriemmaPRR FEB Roma 15/7/20058 The panel of the virtual test instrument

G. AuriemmaPRR FEB Roma 15/7/20059 Preliminary results We have tested 100 Cardiac in 8 hours (51 positives and 49 negatives) 20 of this were draining an excessive current from the LV supply (>1 Amp)

G. AuriemmaPRR FEB Roma 15/7/ Cdet=15 pF NegativePositive

G. AuriemmaPRR FEB Roma 15/7/ Cdet=15 pF NegativePositive

G. AuriemmaPRR FEB Roma 15/7/ Stability of the measurements

G. AuriemmaPRR FEB Roma 15/7/ Conclusions The test bench has been demonstrated to be fast, reliable and accurate A new rugged injiector board with 4 card slots is under construction The testing of 100 boards in a normal workshifts is feasible Limits on the acceptable parameter ’ s range will be implemented in the software Test data will be saved in a database similar to the one used for the MWPC