Realization method of synchronous collection

Abstract

The invention discloses a realization method of synchronous collection. The method can reach the goal of reducing the device cost, and comprises the following steps that: a computer and a low-sampling-speed instrument are connected, an interface design is carried out on the computer to obtain a synchronous collection software setting interface, the parameter setting is carried out on the interface, the time format of the set character strings is converted into time data using seconds as units, each channel is subjected to data collection, the collected data is stored into a two-dimension array, the digital quantity in the two-dimension array is converted according to the analog-to-digital conversion principle of an adopted analog-to-digital converter (ADC), in addition, a Y-axis sampling amplitude value of each channel before the synchronization is obtained, the actual sampling time of each Y-axis sampling amplitude value is calculated and is recorded as X-axis data, a polynomial curve fitting function is adopted for carrying out polynomial fitting on X-axis and Y-axis data by aiming at the synchronized channel, a fitting curve of the synchronized channel is obtained, each X-axis data of a reference channel is introduced into the fitting curve, and the alignment of the waveform of each channel is realized.

Description

technical field [0001] The invention belongs to the field of virtual instruments, in particular to a method for realizing synchronous acquisition. Background technique [0002] In the field of virtual instruments, synchronous acquisition is widely used, and two methods are usually used to realize synchronous acquisition: synchronous sample-and-hold method and multi-analog-to-digital conversion method. Among them, the synchronous sample-and-hold method refers to adding a sample-and-hold circuit in a multi-channel multiplexing architecture, and multiple channels share a group of amplifiers and ADCs. The use of a sample-and-hold circuit will make the data synchronization process more complicated and defects such as time delays will occur, which will greatly reduce the scanning rate of each channel, and the sampling rate will be reduced by about 30%. For applications with low sampling rates, if a synchronous sample-and-hold method is used, the scan rate of the channel will be f...

AI Technical Summary

Problems solved by technology

The multi-analog-to-digital conversion method provides 100% throughput, but due to the application of independent amplifiers and ADCs for each channel, its hardware cost is high, and it is about 20% more expensive than the synchronous sample-and-hold method

Simultaneous acquisition using multiple analog-to-digital conversion methods is a waste of resources and cost for low sample rate applications

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