Analog signal acquisition method for data acquisition transmission apparatus
A technology of analog signals and acquisition methods, applied in the direction of analog-to-digital converters, etc., can solve problems such as damage to the system, increase the design complexity and cycle of the data acquisition and transmission instrument, increase the cost and complexity of use, etc.
Active Publication Date: 2014-09-10
BEIJING SDL TECH
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Problems solved by technology
That is to say, if the analog signal that needs to be collected originally has a range of 0-10V voltage signal, but now needs to collect a voltage signal with a range of 0-5V, in order to achieve the same measurement accuracy, it is necessary to target the new The hardware circuit needs to be redesigned. Similarly, if the original voltage signal with a range of 0-5V is collected, and now it is necessary to collect a voltage signal with a range of 0-10, the original circuit cannot continue to be used, and the hardware can only be redesigned. system, otherwise it will damage the system, which not only increases the design complexity and cycle of the entire data acquisition and transmission instrument, but also increases the related cost and complexity of use
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0028] An embodiment of the present invention provides an analog signal acquisition method for a data acquisition and transmission instrument, so as to realize multi-range analog signal (voltage signal or current signal) input measurement without re-changing the hardware design.
[0029] The above method is based on the data acquisition and transmission instrument, figure 1 It shows a structure of a data acquisition and transmission instrument, which includes: an a...
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The embodiment of the invention discloses an analog signal acquisition method for a data acquisition transmission apparatus. The method comprises the following steps of: regulating a potentiometer so as to change a reference voltage Uref which is output by a power supply chip to an analog quantity conversion circuit; inputting an analog signal by utilizing an analog quantity input interface; converting the analog signal into a voltage signal Ui1 through utilizing a voltage / current signal selecting circuit; compensating and stabilizing the voltage signal Ui1 by utilizing a front end signal processing circuit, and outputting a voltage signal Ui2; and converting the Ui2 into digital quantity Data by utilizing the analog quantity conversion circuit according to a conversion formula, namely Data=(Ui2 / Uref)*2x, wherein x is the conversion digit of the analog quantity conversion chip in the analog quantity conversion circuit. Under the condition that hardware design is not changed again, the input measurement of the multi-range analog signal can be realized.
Description
technical field [0001] The invention relates to the field of signal acquisition, and more specifically relates to an analog signal acquisition method of a data acquisition and transmission instrument. Background technique [0002] The data acquisition and transmission instrument is an instrument that can process analog signals into digital quantities. In the process of using the data acquisition and transmission instrument to collect various analog signals, the inventors found that the ranges of the analog quantities to be collected by the data acquisition and transmission instrument are not the same depending on the environment. In view of the above situation, the technical solution generally adopted at present is to design the hardware circuit of the data acquisition and transmission instrument for a certain specific analog signal range to achieve the effect. That is to say, if the analog signal that needs to be collected originally has a range of 0-10V voltage signal, bu...
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IPC IPC(8): H03M1/12
Inventor 徐汪洋
Owner BEIJING SDL TECH