A Thickness Gauge with Temperature Resistance
A thickness gauge and performance technology, which is applied in the field of thickness gauges with temperature resistance, can solve the problems of thickness gauge fluctuations, inaccurate measurement values, and accuracy effects, and achieves small data display errors, improved stability, and improved stability. The effect of prolonging the service life
Active Publication Date: 2018-12-14
TIANJIN YU RUN DE METAL PROD
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Problems solved by technology
[0002] In the original thickness gauge, such as figure 1 As shown, the output terminal of the micro-voltage amplifying circuit of the AD549 processor is provided with a bias zeroing circuit containing a potentiometer, which is used to conveniently zero the thickness gauge, making the measured value of the micro-voltage amplifying circuit more accurate , but sometimes the thickness gauge needs to work at high temperature, and at high temperature, the resistance of the potentiometer has a large resistance difference with the temperature change, which has a great influence on the accuracy of the micro voltage amplifier circuit processed by AD549 Influence, so that the thickness gauge is easy to display fluctuations, resulting in inaccurate measured values
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[0017] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0018] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood ...
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The invention provides a temperature resistant thickness gauge, which comprises an AD549 processor, a first resistor, a first capacitor, a second resistor, a second capacitor, an AD694 chip, a fourth resistor and a controller. The first resistor and the first capacitor are connected in parallel between the non-inverting input end and the output end of the AD549 processor. After the second resistor and the second capacitor are connected in series, one end is connected with the output end of the AD549 processor and the other end is grounded. The output end of the AD549 processor is connected with the signal input end of the AD694 chip, and the signal output end of the AD694 chip is inputted to the controller through the fourth resistor. According to the invention, the thickness gauge adopts a RC feedback mode, amplifies the voltage signal collected by an acquisition circuit through an AD549 processor, and through an AD694 chip, converts the voltage signal into a current signal inputted to a controller for display. Free of a bias zeroing circuit with potentiometer in the peripheral circuit of an AD549 processor, it is possible to avoid the impact of high temperature on potentiometer resistance as well as the impact of the potentiometer resistance on the outputted voltage of AD549.
Description
technical field [0001] The invention belongs to the technical field of thickness gauge adjustment circuits, in particular to a thickness gauge with temperature resistance. Background technique [0002] In the original thickness gauge, such as figure 1 As shown, the output terminal of the micro-voltage amplifying circuit of the AD549 processor is provided with a bias zeroing circuit containing a potentiometer, which is used to conveniently zero the thickness gauge, making the measured value of the micro-voltage amplifying circuit more accurate , but sometimes the thickness gauge needs to work at high temperature, and at high temperature, the resistance of the potentiometer has a large resistance difference with the temperature change, which has a great influence on the accuracy of the micro voltage amplifier circuit processed by AD549 The impact makes the thickness gauge easy to display fluctuations and result in inaccurate measured values. Contents of the invention [00...
Claims
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IPC IPC(8): G01B21/08
CPCG01B21/08
Inventor 张德明
Owner TIANJIN YU RUN DE METAL PROD