CN114705356B - Self-calibration method of resistance strain gauge force transducer - Google Patents
Self-calibration method of resistance strain gauge force transducer Download PDFInfo
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- CN114705356B CN114705356B CN202210411575.7A CN202210411575A CN114705356B CN 114705356 B CN114705356 B CN 114705356B CN 202210411575 A CN202210411575 A CN 202210411575A CN 114705356 B CN114705356 B CN 114705356B
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- force transducer
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000035945 sensitivity Effects 0.000 claims abstract description 50
- 238000002474 experimental method Methods 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2268—Arrangements for correcting or for compensating unwanted effects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
Abstract
The invention provides a self-calibration method of a resistance strain gauge type force transducer, and relates to the technical field of transducers. The method comprises the following steps: performing a calibration experiment on the resistance strain gauge force sensor on a force standard machine to determine the resistance value of a calibration resistor according to rated sensitivity; when the resistance strain gauge force transducer is calibrated in the use field, the calibration switch is closed so as to connect the determined calibration resistor in parallel to the Wheatstone bridge, thereby completing the calibration work of the resistance strain gauge force transducer. The calibration method uses the calibration resistor to replace the rated sensitivity, and compared with the rated sensitivity with the unit of mV/V, the calibration resistor is fixed and unchanged and is an absolute value, so that the problem of measurement error caused by calibration error can be solved.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a self-calibration method of a resistance strain gauge type force transducer.
Background
The resistance strain gauge type force sensor is a sensor for measuring force value by sticking a resistance strain gauge in an elastic body. When the elastic body is stressed to generate strain, the strain is conducted to the resistance strain gauge to generate stretching or compression in the working direction, so that the resistance value of the resistance strain gauge is changed. According to the hooke's theorem, the ratio of stress to strain of a stressed material in the elastic deformation range is a fixed value, called elastic modulus, and therefore, a measured force value can be obtained by measuring the change of a resistance value.
Typically, the resistive strain gauge constitutes a Wheatstone bridge to measure force values at an excitation voltage of V i In the case of (a), the measuring bridge outputs as the voltage signal V O And V is O Proportional to the measured force. The sensor bearing a rated load F N Time measuring bridge output rated voltage V ON Will excite the voltage V i Converted to 1V DC, the output rated voltage V of the bridge is measured at the moment ON Can be defined as the nominal sensitivity K of the sensor in mV/V. After each sensor is manufactured, the rated sensitivity K is required to be calibrated on a force standard machine through a test, then in use, an instrument matched with the sensor is set according to the rated sensitivity K, the sensor is calibrated according to the value K by the instrument, and the measured force value data of the sensor is obtained through conversion. In fact, the method has the problem of inaccurate field measurement value, and the reason is that the nominal sensitivity K obtained by calibration is a relative quantity and is obtained by calibration of a standard instrument, but if the accuracy of the internal reference voltage of the instrument used on the field is not high, calibration errors are generated by the calibration of the nominal sensitivity K, so that the measured force value data is inaccurate; and the instrument used on site needs to manually input the rated sensitivity K, and measurement errors can be caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a self-calibration method of a resistance strain gauge type force transducer, so as to solve the problem of measurement errors caused by calibration errors of the resistance strain gauge type force transducer.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides a self-calibration method of a resistance strain gauge type force transducer, which is used for a self-calibration system of the resistance strain gauge type force transducer, wherein the self-calibration system comprises the resistance strain gauge type force transducer, a force standard machine and an instrument matched with the resistance strain gauge type force transducer, the resistance strain gauge type force transducer comprises a Wheatstone bridge formed by four resistance strain gauges, and the Wheatstone bridge comprises a first output terminal, a second output terminal, a first power terminal and a second power terminal; a calibration switch and a calibration resistor which are arranged in series are connected between a first output terminal and a first power supply terminal, when the calibration switch is closed, the calibration resistor is connected with a first resistance strain gauge in parallel, when the calibration switch is opened, the calibration resistor is not connected into a Wheatstone bridge, when the resistance strain gauge type force sensor performs a calibration experiment on a force standard machine, the calibration switch is closed under the condition that the resistance strain gauge type force sensor works in an idle state, and the calibration resistor is used for enabling the output of the resistance strain gauge type force sensor to be equal to the rated sensitivity of the resistance strain gauge type force sensor under the condition of bearing a preset rated force value, and the self-calibration method comprises the following steps:
performing a calibration experiment on the resistance strain gauge force sensor on a force standard machine to determine the resistance value of a calibration resistor according to rated sensitivity;
when the resistance strain gauge force transducer is calibrated in the use field, the calibration switch is closed so as to connect the determined calibration resistor in parallel to the Wheatstone bridge, thereby completing the calibration work of the resistance strain gauge force transducer.
Optionally, the first output terminal is an output positive terminal, the second output terminal is an output negative terminal, the first power terminal is a power positive terminal, and the second power terminal is a power negative terminal.
Optionally, two ends of the calibration switch are respectively electrically connected with the first output terminal and the calibration resistor.
Optionally, the calibration switch is disposed on an instrument matched with the resistance strain gauge type force transducer, the resistance strain gauge type force transducer further comprises a calibration terminal, one end of the calibration resistor is electrically connected with the first power terminal, the other end of the calibration resistor is electrically connected with the calibration terminal, one end of the calibration switch is connected with the first output terminal, and the other end of the calibration switch is electrically connected with the calibration terminal.
Optionally, the calibration resistor is a variable resistor, and when the resistance strain gauge force sensor performs a calibration experiment on the force standard machine, the resistance value of the calibration resistor is adjusted so that the output of the resistance strain gauge force sensor is equal to the rated sensitivity of the resistance strain gauge force sensor under the condition of bearing a preset rated force value, and then the resistance value of the calibration resistor is fixed.
Optionally, performing a calibration experiment on the resistive strain gauge force sensor on a force standard machine to determine a resistance value of the calibration resistor according to the rated sensitivity, including:
removing the inherent zero output of the resistance strain gauge type force transducer through an instrument matched with the resistance strain gauge type force transducer;
loading a preset rated force value on the resistance strain gauge type force transducer through a force standard machine so as to obtain rated sensitivity of the resistance strain gauge type force transducer;
relieving the force applied to the resistance strain gauge load cell to cause the resistance strain gauge load cell to operate in an empty state;
the resistance of the calibration resistor is adjusted so that the output of the resistive strain gauge load cell is equal to the nominal sensitivity, thereby determining the resistance of the calibration resistor.
Optionally, when calibrating the resistive strain gauge force sensor in the field of use, closing the calibration switch to connect the determined calibration resistor in parallel with the wheatstone bridge to complete the calibration of the resistive strain gauge force sensor, including:
the resistance strain gauge type force transducer works in an idle state, and the inherent zero output of the resistance strain gauge type force transducer is eliminated through an instrument matched with the resistance strain gauge type force transducer;
closing the calibration switch to connect the determined calibration resistor in parallel on the wheatstone bridge;
the instrument matched with the resistance strain gauge type force transducer automatically records the calibration sensitivity of the resistance strain gauge type force transducer, and the calibration sensitivity is regarded as the rated sensitivity of the resistance strain gauge type force transducer in the use field.
The beneficial effects of the invention include:
the self-calibration method of the resistance strain gauge force transducer is used for a self-calibration system of the resistance strain gauge force transducer, and the self-calibration system comprises the resistance strain gauge force transducer, a force standard machine and an instrument matched with the resistance strain gauge force transducer, wherein the resistance strain gauge force transducer comprises a Wheatstone bridge formed by four resistance strain gauges, and the Wheatstone bridge comprises a first output terminal, a second output terminal, a first power terminal and a second power terminal; a calibration switch and a calibration resistor which are arranged in series are connected between a first output terminal and a first power supply terminal, when the calibration switch is closed, the calibration resistor is connected with a first resistance strain gauge in parallel, when the calibration switch is opened, the calibration resistor is not connected into a Wheatstone bridge, when the resistance strain gauge type force sensor performs a calibration experiment on a force standard machine, the calibration switch is closed under the condition that the resistance strain gauge type force sensor works in an idle state, and the calibration resistor is used for enabling the output of the resistance strain gauge type force sensor to be equal to the rated sensitivity of the resistance strain gauge type force sensor under the condition of bearing a preset rated force value, and the self-calibration method comprises the following steps: performing a calibration experiment on the resistance strain gauge force sensor on a force standard machine to determine the resistance value of a calibration resistor according to rated sensitivity; when the resistance strain gauge force transducer is calibrated in the use field, the calibration switch is closed so as to connect the determined calibration resistor in parallel to the Wheatstone bridge, thereby completing the calibration work of the resistance strain gauge force transducer. The calibration method uses the calibration resistor to replace the rated sensitivity, and compared with the rated sensitivity K with the unit of mV/V, the calibration resistor is fixed and unchanged and is an absolute value, so that the problem of measurement error caused by calibration error can be solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic electrical schematic diagram of a self-calibration system for a resistance strain gauge load cell provided by an embodiment of the present invention;
FIG. 2 shows a flow chart of a method for self-calibration of a resistance strain gauge load cell provided by an embodiment of the invention;
FIG. 3 shows a flow chart of calibration of a force standard machine for a resistance strain gauge load cell provided by an embodiment of the invention;
fig. 4 shows a flow chart of performing field calibration of a resistance strain gauge load cell provided by an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The nominal sensitivity K of the sensor obtained by calibration in a standard laboratory is a relative quantity value with the unit of mV/V, and the on-site use instrument is calibrated according to the relative quantity value K, and the on-site use instrument has an accuracy problem in reference voltage, so that calibration errors are necessarily generated, and measurement errors are caused. If an absolute scale calibration method is used, the problem of measurement errors due to calibration errors can be avoided. In order to solve the calibration error of the resistance strain gauge type force transducer, the invention provides a self-calibration method of the resistance strain gauge type force transducer so as to improve the measurement accuracy of the resistance strain gauge type force transducer.
FIG. 1 shows a schematic electrical schematic diagram of a self-calibration system for a resistance strain gauge load cell provided by an embodiment of the present invention; FIG. 2 shows a flow chart of a self-calibration method for a resistance strain gauge load cell provided by an embodiment of the invention.
The embodiment of the invention provides a self-calibration method of a resistance strain gauge type force transducer, which is used for a self-calibration system of the resistance strain gauge type force transducer, and comprises a resistance strain gauge type force transducer 101, a force standard machine and a meter 102 matched with the resistance strain gauge type force transducer, wherein the resistance strain gauge type force transducer 101 comprises a Wheatstone bridge formed by four resistance strain gauges (a first resistance strain gauge 111, a second resistance strain gauge 112, a third resistance strain gauge 113 and a fourth resistance strain gauge 114), and the Wheatstone bridge comprises a first output terminal 121, a second output terminal 122, a first power terminal 131 and a second power terminal 132; a calibration switch 141 and a calibration resistor 142 are connected between the first output terminal 121 and the first power supply terminal 131, the calibration resistor 142 is connected in parallel with the first resistive strain gauge 111 when the calibration switch 141 is closed, the calibration resistor 142 is not connected into the wheatstone bridge when the calibration switch 141 is opened, the calibration switch 141 is closed when the resistive strain gauge load cell 101 is operated in an empty state when the resistive strain gauge load cell 101 is calibrated on a force standard machine, and the calibration resistor 142 is used for enabling the output of the resistive strain gauge load cell 101 to be equal to the rated sensitivity of the resistive strain gauge load cell 101 under the load of a preset rated force value.
As shown in fig. 2, the self-calibration method of the resistance strain gauge load cell includes: step 201, performing a calibration experiment on a force standard machine for the resistance strain gauge type force sensor to determine the resistance value of a calibration resistor according to rated sensitivity; and 202, when the resistance strain gauge force transducer is calibrated in the use field, closing a calibration switch to connect the determined calibration resistor in parallel to the Wheatstone bridge, thereby completing the calibration work of the resistance strain gauge force transducer.
In summary, the calibration method uses the calibration resistor R to replace the rated sensitivity K, and compared with the rated sensitivity K with the unit of mV/V, the calibration resistor is fixed and is an absolute value, so that the problem of measurement error caused by calibration error can be solved.
Alternatively, the first output terminal 121 is an output positive terminal, the second output terminal 122 is an output negative terminal, the first power terminal 131 is a power positive terminal, and the second power terminal 132 is a power negative terminal.
Alternatively, both ends of the calibration switch 141 are electrically connected to the first output terminal 141 and the calibration resistor 142, respectively.
Optionally, the calibration switch 141 is disposed on the meter 102 matched with the resistive strain gauge type load cell, the resistive strain gauge type load cell 101 further includes a calibration terminal 151, one end of the calibration resistor 142 is electrically connected to the first power terminal 131, the other end of the calibration resistor 142 is electrically connected to the calibration terminal 151, one end of the calibration switch 141 is connected to the first output terminal 121, and the other end of the calibration switch 141 is electrically connected to the calibration terminal 151.
Optionally, the calibration resistor 142 is a variable resistor, and when the resistance strain gauge force sensor 101 performs a calibration experiment on a force standard machine, the resistance value of the calibration resistor 142 is adjusted so that the output of the resistance strain gauge force sensor 101 is equal to the rated sensitivity of the resistance strain gauge force sensor 101 under the condition of bearing a preset rated force value, and then the resistance value of the calibration resistor 142 is fixed.
The resistive strain gauge load cell 101 is calibrated and calibrated by removing the inherent zero output of the sensor, i.e., the zeroing operation, from the meter 102. After calibration operation is performed by using an instrument matched with the sensor on site, the calibration sensitivity is automatically recorded and is regarded as the rated sensitivity.
In actual operation, the self-calibration method of the resistance strain gauge force sensor changes the structure of the wheatstone bridge, and a calibration resistor R (such as the calibration resistor 142 in FIG. 1) is added, so that the number of connecting wires of the sensor is increased from four to five. When the resistance strain gauge force sensor performs a calibration experiment on a force standard machine, the sensor is enabled to bear a rated force value, at the moment, the rated sensitivity K of the sensor is recorded, then the loading force is removed, the sensor works in an idle state, the calibration switch is in short circuit, the calibration resistor R is connected in parallel to bridge arms of a power supply plus and an output plus, the output of the sensor is enabled to be equal to the rated sensitivity K, and the calibration experiment of the resistance strain gauge force sensor on the force standard machine is completed. When the sensor is calibrated on the site of use, the calibration switch is short-circuited, and the calibration work of the resistance strain gauge type force transducer can be completed at the moment.
When the resistance strain gauge force sensor is stressed, the resistance value of the bridge arm of the Wheatstone bridge is changed, and according to the principle, the resistance value of the bridge arm can be artificially changed to simulate the stress condition of the sensor. When the resistance strain gauge force sensor performs a calibration experiment on the force standard machine, the sensor is enabled to bear a rated force value, at the moment, the rated sensitivity K of the sensor is recorded, then the loading force is removed, the sensor works in an idle state, a specific bridge arm in the Wheatstone bridge is connected with a calibration resistor R in parallel, the output of the sensor is enabled to be equal to the rated sensitivity K, and the calibration experiment of the resistance strain gauge force sensor on the force standard machine is completed. When the sensor is calibrated on the site, the calibration resistor R is connected in parallel to a specific bridge arm in the Wheatstone bridge, and the calibration work of the resistance strain gauge type force transducer can be completed. Compared with the rated sensitivity K with the unit of mV/V, the calibration resistor R is fixed and is an absolute value, so that the problem of measurement error caused by calibration error can be solved.
Fig. 3 shows a flowchart of calibrating a force standard machine by using a resistance strain gauge force sensor according to an embodiment of the present invention.
Optionally, performing a calibration experiment on the resistive strain gauge force sensor on a force standard machine to determine a resistance value of the calibration resistor according to the rated sensitivity, including: step 301, eliminating the inherent zero output of the resistance strain gauge type force transducer through an instrument matched with the resistance strain gauge type force transducer; step 302, loading a preset rated force value on the resistance strain gauge type force transducer through a force standard machine so as to obtain rated sensitivity of the resistance strain gauge type force transducer; step 303, removing the force applied to the resistance strain gauge force sensor so as to enable the resistance strain gauge force sensor to work in an idle state; and 304, adjusting the resistance of the calibration resistor so that the output of the resistance strain gauge force transducer is equal to the rated sensitivity, thereby determining the resistance of the calibration resistor.
Fig. 4 shows a flow chart of performing field calibration of a resistance strain gauge load cell provided by an embodiment of the present invention.
Optionally, when calibrating the resistive strain gauge force sensor in the field of use, closing the calibration switch to connect the determined calibration resistor in parallel with the wheatstone bridge to complete the calibration of the resistive strain gauge force sensor, including: step 401, enabling the resistance strain gauge type force transducer to work in an idle state, and eliminating inherent zero output of the resistance strain gauge type force transducer through an instrument matched with the resistance strain gauge type force transducer; step 402, closing a calibration switch to connect the determined calibration resistor in parallel on the wheatstone bridge; step 403, the instrument matched with the resistance strain gauge type force transducer automatically records the calibration sensitivity of the resistance strain gauge type force transducer, and the calibration sensitivity is regarded as the rated sensitivity of the resistance strain gauge type force transducer in the use field.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, but not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (5)
1. A self-calibration method of a resistance strain gauge force transducer is characterized in that the method is used for a self-calibration system of the resistance strain gauge force transducer,
the self-calibration system comprises a resistance strain gauge force transducer, a force standard machine and an instrument matched with the resistance strain gauge force transducer, wherein the resistance strain gauge force transducer comprises a Wheatstone bridge formed by four resistance strain gauges, the four resistance strain gauges comprise a first resistance strain gauge, a second resistance strain gauge, a third resistance strain gauge and a fourth resistance strain gauge, and the Wheatstone bridge comprises a first output terminal, a second output terminal, a first power terminal and a second power terminal; a calibration switch and a calibration resistor which are arranged in series are connected between the first output terminal and the first power supply terminal, and when the calibration switch is closed, the calibration resistor is connected with the first resistance strain gauge in parallel; when the calibration switch is opened, the calibration resistor is not connected into the Wheatstone bridge; when the resistance strain gauge type force sensor performs a calibration experiment on the force standard machine, the calibration switch is closed under the condition that the resistance strain gauge type force sensor works in an idle state, and the calibration resistor is used for enabling the output of the resistance strain gauge type force sensor to be equal to the rated sensitivity of the resistance strain gauge type force sensor under the condition that a preset rated force value is borne;
the self-calibration method comprises the following steps:
performing a calibration experiment on the resistance strain gauge force sensor on a force standard machine to determine the resistance value of the calibration resistor according to rated sensitivity;
when the resistance strain gauge force transducer is calibrated in the field, the calibration switch is closed so as to connect the determined calibration resistor in parallel with the Wheatstone bridge, thereby completing the calibration work of the resistance strain gauge force transducer,
the calibration experiment is carried out on the resistance strain gauge type force transducer on a force standard machine so as to determine the resistance value of a calibration resistor according to rated sensitivity, and the calibration method comprises the following steps:
removing the inherent zero output of the resistance strain gauge type force transducer through an instrument matched with the resistance strain gauge type force transducer;
loading a preset rated force value on the resistance strain gauge type force transducer through the force standard machine so as to obtain rated sensitivity of the resistance strain gauge type force transducer;
relieving a force applied to the resistance strain gauge load cell to cause the resistance strain gauge load cell to operate in an empty state;
adjusting the resistance of the calibration resistor so that the output of the resistance strain gauge load cell is equal to the nominal sensitivity, thereby determining the resistance of the calibration resistor,
when the calibration is carried out on the resistance strain gauge force transducer in the use field, the calibration switch is closed so as to connect the determined calibration resistor in parallel with the Wheatstone bridge, thereby completing the calibration work of the resistance strain gauge force transducer, and the calibration method comprises the following steps:
enabling the resistance strain gauge type force transducer to work in an idle state, and eliminating the inherent zero output of the resistance strain gauge type force transducer through an instrument matched with the resistance strain gauge type force transducer;
closing the calibration switch to connect the determined calibration resistance in parallel across the wheatstone bridge;
and the instrument matched with the resistance strain gauge type force transducer automatically records the calibration sensitivity of the resistance strain gauge type force transducer, and the calibration sensitivity is regarded as the rated sensitivity of the resistance strain gauge type force transducer at the use site.
2. The method of self-calibration of a resistive strain gauge load cell of claim 1, wherein the first output terminal is an output positive terminal, the second output terminal is an output negative terminal, the first power terminal is a power positive terminal, and the second power terminal is a power negative terminal.
3. The method of self-calibration of a resistance strain gauge load cell of claim 2, wherein two ends of the calibration switch are electrically connected to the first output terminal and the calibration resistor, respectively.
4. A method of self-calibrating a resistance strain gauge load cell according to claim 3, wherein the calibration switch is disposed on a meter associated with the resistance strain gauge load cell, the resistance strain gauge load cell further comprising a calibration terminal, one end of the calibration resistor being electrically connected to the first power supply terminal, the other end of the calibration resistor being electrically connected to the calibration terminal, one end of the calibration switch being connected to the first output terminal, and the other end of the calibration switch being electrically connected to the calibration terminal.
5. The self-calibration method of a resistance strain gauge load cell of claim 1, wherein the calibration resistor is a variable resistor, and the resistance value of the calibration resistor is adjusted when the resistance strain gauge load cell performs a calibration experiment on the force standard machine, so that the output of the resistance strain gauge load cell is equal to the rated sensitivity of the resistance strain gauge load cell under a preset rated force value, and then the resistance value of the calibration resistor is fixed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210411575.7A CN114705356B (en) | 2022-04-19 | 2022-04-19 | Self-calibration method of resistance strain gauge force transducer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210411575.7A CN114705356B (en) | 2022-04-19 | 2022-04-19 | Self-calibration method of resistance strain gauge force transducer |
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| CN114705356A CN114705356A (en) | 2022-07-05 |
| CN114705356B true CN114705356B (en) | 2023-11-14 |
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| CN114705356A (en) | 2022-07-05 |
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