Recurrent pulse response of radio interference measuring apparatus employing an average detector

Recently, the use of the average-reading measuring apparatus has been discussed in connection with the measurement of radio interference produced by computers and other similar digital equipment. These types of equipment use repeated pulses as clock pulses so that they generate pulsive radio interference of high repetition rates. Therefore, theoretical investigation has been made on the recurrent pulse response of average-reading measuring apparatus, especially in the case of high repetition rates. In addition, average-reading measuring apparatus on the market were tested for compliance with the CISPR requirements. It is concluded that some apparatus do not conform to the requirements partly because of the nonlinear response of the detector and partly because of the oscillatory envelope of the predetector stage output for an impulse input.