Tektronix current probe amplifier tcp300 and tcp400 series and probes tektronix tcpa300 the tektronix tcpa300 is an acdc current clamp system that is the ideal solution for all current measuring tasks split core technology combined with a hall sensor allows dc measurements to be made up to 100mhz at signal levels from under 1ma up to several thousand ampere all oscilloscopes with 50omega input can be connected directly to the tcpa series if these current measurement systems are connect