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Novel dynamic torque tester

A dynamic torque and tester technology, applied in the field of manufacturing, can solve the problems of affecting the test effect, unable to effectively extract weak signals, submerged, etc., and achieve the effect of high reliability, strong practicability and remarkable effect

Inactive Publication Date: 2016-07-20
王帅
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] At present, the operational amplifiers of conventional dynamic torque testers mostly use ordinary operational amplifiers. The closed-loop gain of ordinary operational amplifiers is determined by the external resistance connected between their inverting input terminals and output terminals. It can only amplify the signal voltage at both ends and DC signals, noise, or other common-mode voltages
Therefore, the desired signal is drowned by DC offset voltage and noise
For this reason, even the best operational amplifiers cannot effectively extract weak signals, affecting test results

Method used

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  • Novel dynamic torque tester

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Embodiment Construction

[0013] see figure 1 As shown, the present invention includes a sensor, an instrumentation amplifier, a dynamic amplifier, a static amplifier and a selection circuit, and an internal feedback resistor network is provided inside the instrumentation amplifier, and the internal feedback resistor network is isolated from the signal input terminal. The impedance of the two input terminals of the instrumentation amplifier is balanced and the resistance value is very high, reaching ≥10 9 Ω. Its input bias current is very low, only 1nA to 50nA. Its output impedance is very low, typically only a few milliohms (mΩ) at low frequencies. The closed-loop gain of an ordinary op amp is determined by the external resistor connected between its inverting input and output, which amplifies only the signal voltage across it and any DC signal, noise, or other common-mode voltage. Therefore, the desired signal is drowned in DC offset voltage and noise. For this reason, even the best op amps canno...

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Abstract

The invention relates to a novel dynamic torque tester which comprises a sensor, an instrument amplifier, a dynamic amplifier, a static amplifier and a selection circuit. An internal feedback resistance network is arranged in the instrument amplifier and isolated from a signal input end. When weak signals are extracted from sensors and other signal sources, better effect can be achieved than a normal operational amplifier. The effect is obvious.

Description

technical field [0001] The invention belongs to the field of manufacturing technology, and in particular relates to a novel dynamic torque tester. Background technique [0002] At present, the operational amplifiers of conventional dynamic torque testers mostly use ordinary operational amplifiers. The closed-loop gain of ordinary operational amplifiers is determined by the external resistance connected between their inverting input terminals and output terminals. It can only amplify the signal voltage at both ends and DC signals, noise, or other common-mode voltages. Therefore, the desired signal is drowned in DC offset voltage and noise. For this reason, even the best operational amplifiers cannot effectively extract weak signals, affecting the test results. Contents of the invention [0003] The present invention overcomes the deficiencies in the prior art and proposes a novel dynamic torque tester, which uses an instrumentation amplifier to extract weak signals from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L3/00
Inventor 王帅
Owner 王帅
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