An oscilloscope and its timing setting method and system in automatic acquisition mode

Abstract

The invention discloses an oscilloscope and a timing setting method and system thereof under an automatic collection mode. The system comprises a state machine which sets n pieces of states, and a timer, wherein a first state corresponds to timing time and a serial number progressive increase detection period; the nth state corresponds to the timing time and a serial number progressive decrease detection period; other states independently correspond to the timing time, the serial number progressive increase detection period and the serial number progressive decrease detection period; the timing time of the first state to an (n-1)th state progressively increases in sequence; the timing time of the first state is greater than the nth state; when a trigger signal is not detected in the serial number progressive increase detection period of a current state, an adjacent high serial number state is entered; when a plurality of trigger signals are detected in the serial number progressive decrease detection period of the current state, an adjacent low serial number state is entered; and therefore, according to the timing time of the current state of the state machine, timing sampling is carried out. Therefore, the timing time of the timing sample is adaptively regulated, and the stable trigger of a waveform is realized.

Description

technical field [0001] The invention relates to the field of oscilloscopes, in particular to an oscilloscope and a timing setting method and system in an automatic acquisition mode thereof. Background technique [0002] When doing modern electronic design, engineers need to select appropriate trigger conditions according to the characteristics of the electronic signal transmission they are concerned about, and at the same time use an oscilloscope to collect waveforms near the trigger event they are interested in for analysis. In actual design, the engineer does not know whether the current input signal satisfies the trigger condition selected by him, so the current oscilloscope provides a working mode, that is, automatic acquisition mode (AUTO). In this mode, if there is a potential trigger event that meets the trigger conditions, the oscilloscope can collect and display the waveforms near the trigger event and analyze them; if there is no trigger event that meets the condit...

AI Technical Summary

Problems solved by technology

There are two disadvantages in this timer setting method: 1. When the time base is small (such as 10ns), the value T of the timer is also very small. If the probability that the input signal meets the trigger condition is very low, the oscilloscope will not be able to Stable trigger; 2. When the time base is large (such as 10ms), the value T of the timer is also very large. If the input signal does not meet the trigger condition at all, the number of signal frames that can be collected per unit time will be greatly reduced.

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