Method for correcting an analogue amplifier output signal, amplifier module and measurement device

A technology for measuring equipment and amplifiers, applied in amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as expensive manufacturing processes and products, and increased costs

Active Publication Date: 2007-06-27
METTLER TOLEDO INC
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  • Abstract
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  • Application Information

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Problems solved by technology

This type of procedure adds significantly to cost and ma

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  • Method for correcting an analogue amplifier output signal, amplifier module and measurement device
  • Method for correcting an analogue amplifier output signal, amplifier module and measurement device
  • Method for correcting an analogue amplifier output signal, amplifier module and measurement device

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Embodiment Construction

[0060]FIG. 1 gives a diagram of a measuring device 50 having a sensor 10 represented in the form of a Wheatstone bridge circuit. A real sensor element needs to be variable in the amount of its resistance so that the resistance value ideally exhibits a linear dependence on the parameter to be measured, or at least follows the parameter to be measured according to a known systematic relationship. As is known, the four illustrated resistors R in a full bridge circuit 1 , R 2 , R 3 , R 4 At least one of the or two resistors R in the half-bridge circuit 1 , R 2 At least one of them is mutable. A strain gauge for a force measuring cell represents an example for this type of circuit arrangement. Will work voltage U 0 Applied to node K of the Wheatstone bridge circuit 1 and K 2 . two nodes K 3 and K 4 Connected to the signal processing unit 20, the signal processing unit 20 comprises the different processing stages MO, DOP, DMO, SW, SH, AD, AE connected in this way, which ...

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Abstract

The present invention provided a method for correcting the transfer error of an analog amplifier. The transfer error arises from the physical limit of the limited ability of the analog amplifier when following the jump of the amplifier input signal, which is induced by the switch. In a measuring device which includes at least one sensor and a signal processing unit connectting to the sensor and the analog amplifier, wherein, the signal processing unit comprises at least one modulator and/or a multiplexer, an analog amplifier, and at least one processing stage fllowing the analog amplifier value in electrical chain. Said processing stage separates from the amplifier according to the time point when the switch jump occurd, and by means of the switch which is arranged between the amplifier and the processing stage, during the predeterminate overtime phase duration. And the processing stage is controled by the time-out controller, and/or according to the time point when the switch jump occurd, said processing stage is blocked by the time-out controller during the predeterminate overtime phase duration.

Description

technical field [0001] The invention relates to a method, an amplifier module and a measuring device in which a signal is amplified, transformed and sent to an output device in a signal processing unit. Background technique [0002] Analog amplifiers, in particular operational amplifiers and differential amplifiers, are used in signal processing components in which the output signals of eg temperature, humidity, force, or pressure sensors are converted and processed. In most cases, sensors and signal processing components are combined into so-called measuring devices and used in industrial environments. An important type of measuring equipment that places strict demands on signal processing components is force measuring equipment, especially gravimetric measuring equipment. [0003] Gravimetric measuring devices, such as thermoanalytical instruments, balances, moisture measuring instruments, etc., comprise force measuring cells based on different designs depending on the re...

Claims

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Application Information

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IPC IPC(8): G01D3/00G01D3/028G01D3/036G01B7/16G01L1/22H03F3/45H03F3/217H03F1/30
CPCG01G3/147H03F2203/45138H03F2200/261H03F3/38H03F3/45475H03F3/45968H03F1/26H03F3/387
Inventor 西里尔·布赫丹尼尔·雷伯菲利普·R·奥利特
Owner METTLER TOLEDO INC
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