Method and apparatus for automatically adjusting the hold-off time of a dso

Patent metadata

Field	Value
Publication number	US-2018364282-A1
Application number	US-201816005763-A
Country	US
Kind code	A1
Filing date	Jun 12, 2018
Priority date	Jun 14, 2017
Publication date	Dec 20, 2018
Grant date	—

Abstract

The present invention provides a method and apparatus for automatically adjusting the hold-off time of a DSO based on real-time cycle measurements of the system trigger signal: obtaining a cycle sequence by measuring the system trigger signal, the maximum cycle and minimum cycle, then judging the difference of the maximum cycle and minimum cycle: if the difference is greater than a threshold set by user, setting the hold-off time to the maximum cycle, the minimum cycle or the median cycle, then returning; otherwise terminating the adjustment of the hold-off time. At this point, the hold-off time is correctly set. Therefore, the present invention reduces the complexity and time consumption of the hold-off adjustment, and allows the test signal to be quickly and stably displayed on screen of DSO, meanwhile, which makes the trigger adjustment of DSO more convenient.

First claim

What is claimed is:

1 . A method for automatically adjusting the hold-off time of a DSO, comprising:
(1) generating a synchronizing trigger signal according to the characteristics of the test signal, and setting the hold-off time to zero or the minimum value to which the hold-off time can be set; (2) measuring a system trigger signal in real time to obtain a cycle sequence C 1 , C 2 , . . . , C n , wherein the system trigger signal is obtained by holding off the synchronizing trigger signal according to the hold-off time; (3) detecting the cycle sequence C 1 , C 2 , . . . , C n to obtain a maximum cycle and a minimum cycle, where the maximum cycle is denoted by C max C max , the minimum cycle is denoted by C max C min ; (4) judging the difference C max −C min : if the difference C max −C min is greater than a threshold set by user, setting the hold-off time to the maximum cycle C max , the minimum cycle C min or the median cycle (C max −+C min )/2, and then returning to step (2); otherwise, the difference C max −C min is not greater than a threshold set by user, terminating the adjustment of the hold-off time. At this point, the hold-off time is correctly set.

2 . The method for automatically adjusting the hold-off time of a DSO as recited in claim 1 further, comprising setting an upper limit to the number of iterations, i.e. the number of returning to step (2), when the upper limit is reached, terminating the adjustment of the hold-off time.

3 . A apparatus for automatically adjusting the hold-off time of a DSO, comprising:
a trigger module for generating a synchronizing trigger signal according to the characteristics of the test signal; a hold-off module for obtaining a system trigger signal by holding off the synchronizing trigger signal according to the hold-off time, where the system trigger signal is outputted to the acquisition module to control the acquisition of the test signal; wherein further comprising: a cycle measurement and judgment module for measuring the system trigger signal in real time to obtain a cycle sequence C 1 , C 2 , . . . , C n , detecting the cycle sequence C 1 , C 2 , . . . , C n to obtain a maximum cycle and a minimum cycle, where the maximum cycle is denoted by C max , the minimum cycle is denoted by C min , and judging the difference C max −C min : if the difference C max −C min is greater than a threshold set by user, setting the hold-off time to the maximum cycle C max , minimum cycle C min or the median cycle (C max +C min )/2, and then continuing to measure, detect, and judge, until the difference C max −C min is not greater than a threshold set by user or the number of iterations reaches the upper limit.

Assignees

• Univ Electronic Sci & Tech China

Inventors

• Zhang Qinchuan
• Tan Feng
• Pan Huiqing
• Zeng Hao
• Zheng Luonan

Classifications

• G01R13/0254 Primary

  for triggering, synchronisation · CPC title

• G01R13/0209 Primary

  in numerical form · CPC title