Study On Portable Intelligent Current Meter

Presently, some current meter for rivers are designed complex with a huge system and a simple function. They can't satisfy the requirement for the faster measurement through multi-channels. With the development of new tech and electronic production, the contradiction is sharp. To solve this problem ,by increasing the accuracy and the sample-speed, adapting to the domestic situation and fitting for the measurement in the field, the intelligent portable current meter is needed. This machine is based on single-chip and CPLD chips as data sampling interface with LLD screen. It combine with counting, calculating a round time, speed-checking in two ways . It has credible performance with high accuracy, a little bulk , a little power and is easy to operate. It can be used in many fields.This issue starts from the research background, then design requirement, hardware, software and finally result.Firstly, giving an introduction about the current meter research in and outside nation and finding the reality meaning to study this intelligent portable current meter.Secondly, according to the design requirement and the performance, it gives a design.Thirdly, it gives a detail about the hardware and the circuit (single-chip, communication interface circuit, sign input channel and analogous circuit). The key point is how to realize the fast data sampling through multi-channels(8 channels). In this project a lot of CPLD chips are used to make up the data sampling circuit. The CPLD chip has a lot of resource and integrates complex logic circuit inside. The hardware function of controller develops by MAX+PLUSâ…¡ provided by ALTERA corp. Every function is programmed by softwareFourthly, it explains all functions and how to realize these functions. The all procedures are programmed modularly by using C51 assembling language. Thus, the thought of the software is easy to be understood and is easy to be updated, on the other hand the C51 language support float calculation which guarantees the output accuracy.Fifthly, it gives a conclusion to the issue by analyzing from the sampling data, and put forward some new thinking about the current meter design.Finally, it introduces the software about dealing with velocity of flow on computer , emphasizing on how to build all kinds of require and charts needed.