Four-Channel Digital Scopemeter Hardware Design

Scopemeter has the advantages of traditional desktop oscilloscope function,showing intuitive advantages,and small size,easy to carry,with isolation input,the use of security,which is widely used in the field,industrial scene,automotive electronics and other occasions.A four-channel oscilloscope can also measure four related signals at the same time to meet higher test requirements for distribution,multiphase power systems.Based on the handheld digital oscilloscope project,this paper studies the overall hardware design of the four-channel digital oscilloscope in detail.Mainly focus on improving the performance of the oscilloscope table while reducing hardware power consumption,extended using time,the digital oscilloscope key technologies were discussed.Combined with the master's degree during the study of the actual participation of the project,focusing on the following aspects to discuss:1.Design of wideband isolation channel.The bandwidth of the signal conditioning channel directly determines whether the highest frequency of the signal can be measured without distortion.High isolation ensures the safety of the test.In this paper,the signal conditioning scheme of signal conditioning channel is discussed,and the electrical safety problem in the design process is analyzed in detail from the concept of measurement level.In addition,this paper also for open circuit noise,temperature drift,four channel consistency and other issues raised the solution.2.Power and battery management.One of the design criteria of hand-held instruments is power management and battery management.This paper first measurement the power requirements of the entire hardware system and designs a power distribution system to provide high-performance work for components And modules.And then reference to the lithium-ion battery charge and discharge characteristics of the appropriate battery management program to complete the full management of the contents of the battery.3.Research on low power consumption strategy of system.In order to overcome the common problems of handheld electronic equipment,this paper analyzes the power consumption of the whole hardware system from the system level,and then analyzes the low power consumption of the high energy consumption functional module according to the conclusion of the analysis.