Leakage currents of NOVACAP Company NPO surface mount high voltage multilayer ceramic capacitors, type LS1808N102K302NX080, were measured before and after irradiation by 200MeV protons at a fluence of 5 × 1014/cm2. Two banks of 20 capacitors showed that the leakage current was < 1 × 10−11 ampere. As we see from the results, the average current was very close to zero and the measurement accuracy was limited by the equipment sensitivity and the experimental setup noise.