Tektronix passive high voltage probe tektronix p5100a the tektronix p5100a is a passive high voltage probe that is ideal for heavy duty high performance measurements of voltages up to 25kv the p5100 is a low capacitance high voltage probe designed for higher frequency applications the probe can be compensated to match plug ins and oscilloscopes with nominal input capacitances of 7 30pfapplications power supply design design motor drive electronic ballast power semiconductors switch m