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HV capacitor Testing

HV capacitor Testing. Two tasks Capacitor testing (Duke) Capacitor preparation (Hampton) Capacitors under testing Johanson surface mount 1000pf, rated 2000 V, size 821. Material : X7R Choices are limited due to space Capacitors from four different lots (batches).

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HV capacitor Testing

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  1. HV capacitor Testing

  2. Two tasks • Capacitor testing (Duke) • Capacitor preparation (Hampton) • Capacitors under testing • Johanson surface mount • 1000pf, rated 2000 V, size 821. • Material : X7R • Choices are limited due to space • Capacitors from four different lots (batches). • ~Two years ago, the same capacitors (from different lots) were radiation tested at CERN and the results were mixed.

  3. HV testing • HV cycle • Connect 30 capacitors from each batch to HV=2000 V and discharge. • Measure the total capacitance every 50 discharges. • Number of cycles : 2000 • Results • Batch 1 • One capacitor • Surface HV breakdown during 1500-1550 cycles • Inner HV breakdown during 1600-1650 cycles • Batch 2/3/4 : No problem • Conclusion : Pass

  4. Test setup

  5. Plan • Repeat the same test with capacitors from HU (encapsulated and legs are attached) • Long term test • 30 capacitors from each batch connected to HV=2000 V and current is monitored. • Irradiation test – CERN • Requirement : All capacitors from all batches should pass. • Decision by the end of 2002. There should be no problem in getting the capacitors (~6 weeks). • Radiation test on ~100 random samples once the production batch is available • Option in case of failure • Go to lesser capacitance with different material (NPO)

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