Method for accurate time measurement and its measuring circuit
A technology of accurate time and pulse measurement, applied in the direction of electrical components, automatic power control, etc., can solve problems such as difficulty in achieving high measurement accuracy and difficulty in normal operation of counter chips, and achieve improved time measurement stability, simple structure, The effect of a high degree of modularity
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[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0044] Such as figure 1Shown is the basic principle diagram of the precise time measurement method of the present invention. The time when the event to be tested occurs t e Equal to the base 1PPS time t 1PPS , Gross error time T 0 , time difference T 1 and time difference T 2 As can be seen from the figure, the traditional simple counter method cannot measure the time difference T 1 and time difference T 2 , so that there exists t e large error. The basic train of thought of the present invention is to adopt delay line method to time difference T 1 and time difference T 2 Carry out the second measurement, under the condition of using the same frequency reference of 10MHz, t e Measurement accuracy can reach sub-nanoseconds.
[0045] The method for precise time measurement of the present invention, its steps are:
[0046] ①...
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