Channel presetting method for analog-digital joint data acquisition device

Abstract

The invention relates to a channel presetting method for an analog-digital joint data acquisition device, which comprises the following steps: firstly presetting the number N of circuit channels of a plurality of parallel analog enlargement conditioning circuits, the enlargement factor K of each circuit channel and an AD sampling initial channel; leading an analog input signal to pass through theinitial analog enlargement conditioning circuit and the plurality of the parallel analog enlargement conditioning circuit for enlargement, and then be enlarged with different enlargement factors by Nchannels; then leading a digital control module to trigger the AD conversion of all the channels in a timing manner, triggering the interruption of a CPU and reading sampled values of the preset AD sampling initial channel; using the digital control module to analyze and compare the sampled values; and carrying out presetting of the sampling channels The method can select the range and the channels according to the intensity and the change trend of the input signal, dynamically change the gain, expand the sampling range, ensure the sampling precision of the weak signal, avoid the big signal from exceeding the range, further not increase the sampling holding acquisition time when changing the gain, not affect the sampling rate and the bandwidth of a system and realize the high-bandwidth high-speed data acquisition.

Description

technical field [0001] The invention relates to a channel preset method of an analog-digital combined data acquisition device which is carried out by combining an analog circuit and a digital control circuit, and belongs to the technical field of data acquisition. Background technique [0002] During the measurement process, the magnification and range of the test circuit must be able to dynamically change with the change of the analog input signal. The general acquisition method and acquisition system are an analog signal connected to an analog amplifier circuit and an AD sampling channel. The analog amplifier circuit usually uses a programmable gain amplifier circuit to automatically change the gain of the amplifier, but this method increases from changing the gain to AD sampling. It takes extra time, limits the bandwidth of the acquisition system, and cannot meet the acquisition needs of fast-changing high-frequency signals. Contents of the invention [0003] The purpo...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a channel preset method for an analog-digital combined data acquisition device, to solve the problem of increasing the extra time from changing the gain to AD sampling in the existing method, limiting the bandwidth of the acquisition system, and unable to meet rapidly changing high-frequency signals The collection needs of the problem

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