Tektronix passive high voltage probe tektronix tpp0850 the tektronix ttp0850 is a passive high voltage probe that is ideal for heavy duty high performance measurements of voltages up to 25kv the tpp0850 offers the industrys highest bandwidth probe 800mhz for high voltage signals this is ideal for testing power semiconductors and switch mode power supplies which continue to increase in switching speed to minimize power loss creating a need for faster rise time higher bandwidth and hi