Test of HV Prototype Boards for LHCb Outer Tracker. NIKHEF, Amsterdam The Netherlands 2003-10-16. HV Boards. x 32. Johanson Capacitors PCB Embedded. Working HV = 1,600V Mass Production: 1,950. Test items: Leakage Current Capacitance Micro-cracks inside Caps. Experimental Setup.
Test of HV Prototype Boards for LHCb Outer Tracker
Johanson Capacitors PCB Embedded
Working HV = 1,600V
Mass Production: 1,950
HV to gnd net on HV boards may contributes to the measured leakage currents!
HV = 2kV, Thermal Cycling = 20oC ~73oC,
Time = 24days, 15 boards are tested
20oC 45 min.
20oC 73oC 15 min.
73oC 45 min.
73oC 20oC 15 min.
Due to unknown error of the temperature control system
Leakage currents of 15 boards are logged,
as well as the temperature and relative humidity
Left: with gnd net on HV board connected
Right: only 32 output pins of capacitors connected
Contribution from HV to gnd net on HV board:
~1nA@T=20oC and ~10nA@T=73oC
Spread at T=73oC (T=20oC) is caused by time needed to warm up (cool down) the capacitors inside PCB
Not sensitive to RH anymore
Ileak of each board ↓
< 2nA, including the component from HV to gnd net on HV boards
479: ~30pF less than before
1: 187pF, 2/3 of other capacitors