数字示波器大触发延迟时间的量子化测量方法

A Novel Digitizing Measurement Method for Large Trigger Delay of Digital Oscilloscopes

针对数字示波器的大触发延迟时间,提出了一种量子化测量方法。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,而整数的获取,通过将大触发延迟时间分割成多个小触发延迟增量之和,分别触发测量各个小触发延迟时间增量,然后,以累积方式获得大触发延迟时间粗测值,并以此计算获得整数值,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该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中。

Aiming at the large trigger delay of digital oscilloscope, a novel digitizing 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, first, one can divided the large trigger delay into many smaller trigger delay increment, through measuring each smaller trigger delay increment directly, then the cumulative results is gotten. Its the rude result of large trigger delay that can be used to calculate the integer. 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 measurement and calibration of large trigger delay of digital oscilloscopes.