数字示波器大触发延迟时间的校准方法

摘要

针对数字示波器的大触发延迟时间，提出了一种标称校准方法。使用正弦激励信号周期作为测量尺度标准，将大触发延迟时间表述成整数个正弦周期与一个小数个正弦周期的合成。小数周期部分用相位差法直接测量获得，而整数部分则通过最大允许误差极限已知的标称大触发延迟时间计算获得，最终将两部分时间合成，得大触发延迟时间测量结果。在数字示波器上所作的一组实验验证了本文方法的正确性与可行性。该方法可用于数字示波器大触发延迟时间的精确测量和计量校准。%Aiming at the large trigger delay of digital oscilloscope, a novel multi-frequency measurement method is presented. By using the period of sinusoidal as standard, the large trigger delay is divided into two parts, one part is just consist of many periods of sine wave, another part include the partial period of sine wave. The partial period part can be measured through phase difference method, and to the integer periods part, by using the nominal trigger delay divide the stimulation frequency, one can calculate the number of periods. Finally, through composing of the two parts, the large trigger delay is gotten. The correctness and feasibility are proved by some experiments on digital oscilloscope, the method can be used to the calibration of large trigger delay of digital oscilloscopes.