| 摘要 |
PURPOSE:To measure a waveform width easily and accurately even if the peak value of a waveform to be measured is changed, by using an attenuated waveform, which is obtained by attenuating an observation waveform, together with the observation waveform. CONSTITUTION:An input observation waveform is attenuated to 1/2 by an attenuator 1 and has the peak value held by a peak hold circuit 2, and this peak value and the observation waveform are compared in level with each other by a comparator 3. Similarly, the output of a peak hold circuit 5 is inputted together with the observation waveform to a comparator 4, and they are compared in level with each other. Outputs of comparators 3 and 4 are inputted to an AND circuit 7 through an AND circuit 6; and only when the output of the AND circuit 6 is 1, clock pulses from a pulse generator 8 are supplied to a counter 9. Its count value is raised twice to obtain the half-amplitude level of a waveform to be measured. Thus, the threshold level is set to a prescribed level for the peak value of the observation waveform to measure the waveform width accurately. |
