CN114705356A - Self-calibration method of resistance strain gauge type force transducer - Google Patents
Self-calibration method of resistance strain gauge type force transducer Download PDFInfo
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- CN114705356A CN114705356A CN202210411575.7A CN202210411575A CN114705356A CN 114705356 A CN114705356 A CN 114705356A CN 202210411575 A CN202210411575 A CN 202210411575A CN 114705356 A CN114705356 A CN 114705356A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000035945 sensitivity Effects 0.000 claims abstract description 50
- 238000002474 experimental method Methods 0.000 claims abstract description 19
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 2
- 238000011065 in-situ storage 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
- 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
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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
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- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention provides a self-calibration method of a resistance strain gauge type force transducer, and relates to the technical field of sensors. The method comprises the following steps: performing a calibration experiment on the resistance strain gauge type force transducer on a force standard machine to determine the resistance value of the calibration resistor according to the rated sensitivity; and when the resistance strain gauge type force transducer is calibrated in the use field, the calibration switch is closed, so that the determined calibration resistance is connected in parallel to the Wheatstone bridge, and the calibration work of the resistance strain gauge type force transducer is completed. 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 invariable 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 measuring sensor.
Background
A resistance strain gauge type force transducer is a transducer which is used for measuring a force value by sticking a resistance strain gauge in an elastic body. When the elastic body is stressed to generate strain, the strain is transmitted to the resistance strain gauge to enable the resistance strain gauge to generate stretching or compression in the working direction, and therefore 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 an elastic deformation range is a fixed value called elastic modulus, so that a measured force value can be obtained by measuring the change of the resistance value.
Typically, the resistive strain gages are combined into a Wheatstone bridge to measure force values at an excitation voltage of ViIn the case of (2), the output of the measuring bridge is a voltage signal VOAnd V isOIs in direct proportion to the measured force. The sensor bears a rated load FNTime measuring bridge output rated voltage VONWill excite the voltage ViConverted to 1V DC, the output rated voltage V of the measuring bridgeONCan be defined as the nominal sensitivity K of the sensor, in mV/V. After each sensor is manufactured, the rated sensitivity K needs to be calibrated on a force standard machine through tests, then in use, an instrument matched with the sensor is set according to the rated sensitivity K, the instrument calibrates the sensor according to the value K, and measured force value data of the sensor is obtained through conversion. In fact, the above method has the problem that the field measurement value is inaccurate, and the reason is that the rated sensitivity K obtained by calibration is a relative quantity and is obtained by calibration of a standard instrument, but if the precision of the internal reference voltage of the instrument used on the field is not high, calibration errors are generated by calibration of the rated sensitivity K, so that the measured force value data is inaccurate; and the instrument used in the field needs to manually input the rated sensitivity K, and measurement errors can also be caused.
Disclosure of Invention
The present invention is directed to a method for self-calibrating a resistance strain gauge type load cell, so as to solve the problem of measurement errors caused by calibration errors of the resistance strain gauge type load cell.
In order to achieve the 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 self-calibration method comprises the following steps that 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 a resistance strain gauge type force sensor is subjected to a calibration experiment on a force standard machine, under the condition that the resistance strain gauge type force sensor works in an unloaded state, the calibration switch is closed, 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 type force transducer on a force standard machine to determine the resistance value of the calibration resistor according to the rated sensitivity;
and when the resistance strain gauge type force transducer is calibrated in the use field, the calibration switch is closed, so that the determined calibration resistance is connected in parallel to the Wheatstone bridge, and the calibration work of the resistance strain gauge type force transducer is completed.
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 electrically connected to the first output terminal and the calibration resistor, respectively.
Optionally, the calibration switch is disposed on an instrument that is configured with the resistance strain gauge type load cell, the resistance strain gauge type load cell further includes a calibration terminal, one end of the calibration resistor is electrically connected to the first power terminal, the other end of the calibration resistor is electrically connected to the calibration terminal, one end of the calibration switch is connected to the first output terminal, and the other end of the calibration switch is electrically connected to the calibration terminal.
Optionally, the calibration resistor is a variable resistor, and when the resistance strain gauge type load cell is subjected to a calibration experiment on a force standard machine, the resistance value of the calibration resistor is adjusted so that the output of the resistance strain gauge type load cell is equal to the rated sensitivity of the resistance strain gauge type load cell 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 resistance strain gauge load cell on a force standard machine to determine a resistance value of the calibration resistor according to the rated sensitivity, including:
clearing the inherent zero output of the resistance strain gauge type force measuring sensor through an instrument matched with the resistance strain gauge type force measuring sensor;
loading a preset rated force value on the resistance strain gauge type force measuring sensor through a force standard machine to obtain the rated sensitivity of the resistance strain gauge type force measuring sensor;
removing the force applied to the resistance strain gauge type force sensor to enable the resistance strain gauge type force sensor to work in an unloaded state;
and adjusting the resistance value of the calibration resistor to enable the output of the resistance strain gauge type load cell to be equal to the rated sensitivity, so that the resistance value of the calibration resistor is determined.
Optionally, when calibrating the resistance strain gauge type load cell in the field of use, closing the calibration switch to connect the determined calibration resistance in parallel to the wheatstone bridge, thereby completing the calibration of the resistance strain gauge type load cell, including:
enabling the resistance strain gauge type force measuring sensor to work in an idle state, and clearing the inherent zero output of the resistance strain gauge type force measuring sensor through an instrument matched with the resistance strain gauge type force measuring sensor;
closing the calibration switch to connect the determined calibration resistance in parallel across the wheatstone bridge;
the instrument matched with the resistance strain gauge type force measuring sensor automatically records the calibration sensitivity of the resistance strain gauge type force measuring sensor, and the calibration sensitivity is regarded as the rated sensitivity of the resistance strain gauge type force measuring sensor in a use field.
The beneficial effects of the invention include:
the self-calibration method of the resistance strain gauge type force transducer is used for a self-calibration system of the resistance strain gauge type force transducer, 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 supply terminal and a second power supply terminal; the self-calibration method comprises the following steps that 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 a resistance strain gauge type force sensor is subjected to a calibration experiment on a force standard machine, under the condition that the resistance strain gauge type force sensor works in an unloaded state, the calibration switch is closed, 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 type force transducer on a force standard machine to determine the resistance value of the calibration resistor according to the rated sensitivity; and when the resistance strain gauge type force transducer is calibrated in the use field, the calibration switch is closed, so that the determined calibration resistance is connected in parallel to the Wheatstone bridge, and the calibration work of the resistance strain gauge type force transducer is completed. 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 invariable 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 in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of the electrical configuration of a self-calibration system for a resistive strain gauge load cell provided by an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for self-calibration of a resistive strain gauge load cell provided by an embodiment of the present invention;
FIG. 3 illustrates a flow chart for force calibration of a resistive strain gage load cell provided in an embodiment of the present invention;
FIG. 4 illustrates a flow chart for in-situ calibration of a resistive strain gauge load cell provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The rated sensitivity K obtained by calibrating the sensor in a standard laboratory is a relative quantity value with the unit of mV/V, and the field instrument is calibrated according to the relative quantity value K. If the absolute ratio calibration method is adopted, the problem of measurement errors caused by 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 precision of the resistance strain gauge type force transducer.
FIG. 1 is a schematic diagram of the electrical configuration of a self-calibration system for a resistive strain gauge load cell provided by an embodiment of the present invention; FIG. 2 is a flow chart illustrating a method for self-calibrating a resistive strain gauge load cell provided by an embodiment of the present invention.
The embodiment of the invention provides a self-calibration method of a resistance strain gauge type load cell, which is used for a self-calibration system of the resistance strain gauge type load cell, the self-calibration system comprises a resistance strain gauge type load cell 101, a force standard machine and an instrument 102 matched with the resistance strain gauge type load cell, the resistance strain gauge type load cell 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 supply terminal 131 and a second power supply terminal 132; a calibration switch 141 and a calibration resistor 142 which are arranged in series are connected between the first output terminal 121 and the first power supply terminal 131, when the calibration switch 141 is closed, the calibration resistor 142 is connected in parallel with the first resistance strain gauge 111, when the calibration switch 141 is opened, the calibration resistor 142 is not connected into a wheatstone bridge, when the resistance strain gauge type load cell 101 performs a calibration experiment on a force standard machine, and when the resistance strain gauge type load cell 101 operates in an unloaded state, the calibration switch 141 is closed, and the calibration resistor 142 is used for enabling the output of the resistance strain gauge type load cell 101 to be equal to the rated sensitivity of the resistance strain gauge type load cell 101 under the condition of bearing a preset rated force value.
As shown in FIG. 2, the method of self-calibrating a resistive strain gauge load cell comprises: step 201, performing a calibration experiment on a resistance strain gauge type force transducer on a force standard machine to determine the resistance value of a calibration resistor according to rated sensitivity; step 202, when the resistance strain gauge type force transducer is calibrated in a use site, the calibration switch is closed, so that the determined calibration resistance is connected to the wheatstone bridge in parallel, and the calibration work of the resistance strain gauge type force transducer is completed.
In summary, the calibration method uses the calibration resistor R instead of the rated sensitivity K, 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 errors caused by calibration errors 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 associated with the resistance strain gauge load cell, the resistance strain gauge load cell 101 further includes a calibration terminal 151, one end of the calibration resistor 142 is electrically connected to the first power supply 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 type load cell 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 type load cell 101 is equal to the rated sensitivity of the resistance strain gauge type load cell 101 under the condition of bearing a preset rated force value, and then the resistance value of the calibration resistor 142 is fixed.
During calibration and calibration, the strain-resistant gauge type load cell 101 is cleared of the inherent zero output of the cell by the gauge 102, i.e., a zeroing operation. After the instrument matched with the sensor on site is used for carrying out calibration operation, the calibration sensitivity is automatically recorded and is regarded as the rated sensitivity.
In practice, the self-calibration method of the resistance strain gauge type load cell changes the structure of the Wheatstone bridge, and adds one calibration resistor R (such as the calibration resistor 142 in FIG. 1), so that the connecting wires of the sensor are increased from four to five. When the resistance strain gauge type force transducer is used for carrying out calibration experiments on a force standard machine, the sensor bears a rated force value, 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 connection, the calibration resistor R is connected in parallel to bridge arms of 'power supply +' and 'output +', the output of the sensor is equal to the rated sensitivity K, and therefore the calibration experiments of the resistance strain gauge type force transducer on the force standard machine are completed. When the sensor is calibrated on the use site, the calibration switch is short-circuited, and the calibration work of the resistance strain gauge type force measuring sensor can be completed at the moment.
When the resistance strain gauge type force transducer is stressed, the resistance value of a bridge arm of the Wheatstone bridge changes, and according to the principle, the resistance value of the bridge arm can be artificially changed to simulate the stress condition of the transducer. When the resistance strain gauge type force transducer is used for carrying out calibration experiments on a force standard machine, the sensor bears a rated force value, 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 a Wheatstone bridge is connected with a calibration resistor R in parallel, the output of the sensor is equal to the rated sensitivity K, and accordingly the calibration experiments of the resistance strain gauge type force transducer on the force standard machine are completed. When the sensor is calibrated on the use site, the calibration resistor R is connected in parallel with a specific bridge arm in the Wheatstone bridge, and the calibration work of the resistance strain gauge type force-measuring sensor can be completed at the moment. Compared with the rated sensitivity K with the unit of mV/V, the calibration resistor R is a fixed and invariable absolute value, thereby solving the problem of measurement error caused by calibration error.
FIG. 3 illustrates a flow chart for force calibration of a resistive strain gage load cell provided by an embodiment of the present invention.
Optionally, performing a calibration experiment on the resistance strain gauge load cell on a force standard machine to determine a resistance value of the calibration resistor according to the rated sensitivity, including: 301, clearing the inherent zero output of the resistance strain gauge type force measuring sensor through an instrument matched with the resistance strain gauge type force measuring sensor; step 302, loading a preset rated force value on the resistance strain gauge type force transducer through a force standard machine to obtain the rated sensitivity of the resistance strain gauge type force transducer; step 303, removing the force applied to the resistance strain gauge type force transducer to enable the resistance strain gauge type force transducer to work in an unloaded state; and step 304, adjusting the resistance value of the calibration resistor to enable the output of the resistance strain gauge type force transducer to be equal to the rated sensitivity, so that the resistance value of the calibration resistor is determined.
FIG. 4 illustrates a flow chart for in-situ calibration of a resistive strain gauge load cell provided by an embodiment of the present invention.
Optionally, when the resistance strain gauge type load cell is calibrated in the use field, the calibration switch is closed to connect the determined calibration resistance in parallel to the wheatstone bridge, so as to complete the calibration work of the resistance strain gauge type load cell, including: step 401, making the resistance strain gauge type force measuring sensor work in an idle load state, and clearing the inherent zero output of the resistance strain gauge type force measuring sensor through an instrument matched with the resistance strain gauge type force measuring sensor; step 402, closing a calibration switch to connect the determined calibration resistor in parallel to a wheatstone bridge; and 403, automatically recording the calibration sensitivity of the resistance strain gauge type force transducer by an instrument matched with the resistance strain gauge type force transducer, and regarding the calibration sensitivity as the rated sensitivity of the resistance strain gauge type force transducer on the use site.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (7)
1. A self-calibration method of a resistance strain gauge type force transducer is characterized in that the method is used for a self-calibration system of the resistance strain gauge type force transducer,
the self-calibration system comprises a resistance strain gauge type force transducer, a force standard machine and an instrument matched with the resistance strain gauge type force transducer, wherein 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 wiring terminal, a second output wiring terminal, a first power supply wiring terminal and a second power supply wiring 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 load cell performs a calibration experiment on the force standard machine, under the condition that the resistance strain gauge type load cell works in an unloaded state, the calibration switch is closed, and the calibration resistor is used for enabling the output of the resistance strain gauge type load cell to be equal to the rated sensitivity of the resistance strain gauge type load cell under the condition of bearing a preset rated force value;
the self-calibration method comprises the following steps:
performing a calibration experiment on the resistance strain gauge type force transducer on a force standard machine to determine the resistance value of the calibration resistor according to the rated sensitivity;
and when the resistance strain gauge type load cell is calibrated in the use field, closing the calibration switch to connect the determined calibration resistance in parallel to the Wheatstone bridge, thereby completing the calibration work of the resistance strain gauge type load cell.
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-calibrating a resistive strain gauge load cell of claim 2, wherein the calibration switch is electrically connected at its ends to the first output terminal and the calibration resistor, respectively.
4. The method of claim 3, wherein the calibration switch is disposed on a meter associated with the resistive strain gauge load cell, the resistive strain gauge load cell further comprising a calibration terminal, one end of the calibration resistor being electrically connected to the first power 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, the other end of the calibration switch being electrically connected to the calibration terminal.
5. The method of claim 1, wherein the calibration resistor is a variable resistor, and wherein the resistance value of the calibration resistor is adjusted during a calibration experiment of the resistance strain gauge load cell on the force standard machine so that the output of the resistance strain gauge load cell is equal to the nominal sensitivity of the resistance strain gauge load cell under a load of a preset nominal force value, and then the resistance value of the calibration resistor is fixed.
6. The method of self-calibrating a resistive strain gauge load cell of claim 1, wherein said conducting a calibration experiment on said resistive strain gauge load cell on a force standard machine to determine the resistance of a calibration resistor according to a nominal sensitivity comprises:
clearing the inherent zero output of the resistance strain gauge type force measuring sensor through an instrument matched with the resistance strain gauge type force measuring sensor;
loading a preset rated force value on the resistance strain gauge type force transducer through the force standard machine to obtain the rated sensitivity of the resistance strain gauge type force transducer;
removing the force applied to the resistance strain gauge type load cell so as to enable the resistance strain gauge type load cell to work in an unloaded state;
and adjusting the resistance value of the calibration resistor to enable the output of the resistance strain gauge type load cell to be equal to the rated sensitivity, so that the resistance value of the calibration resistor is determined.
7. The method of self-calibrating a resistive strain gauge load cell of claim 1, wherein said calibrating said resistive strain gauge load cell in a field of use with said calibration switch closed to connect said determined calibration resistance in parallel to said wheatstone bridge to complete calibration of said resistive strain gauge load cell comprises:
enabling the resistance strain gauge type force measuring sensor to work in an idle state, and clearing the inherent zero output of the resistance strain gauge type force measuring sensor through an instrument matched with the resistance strain gauge type force measuring sensor;
closing the calibration switch to connect the determined calibration resistance in parallel across the wheatstone bridge;
a meter associated with the resistance strain gauge load cell automatically records the calibration sensitivity of the resistance strain gauge load cell and considers the calibration sensitivity as the rated sensitivity of the resistance strain gauge load cell at the site of use.
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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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| CN202210411575.7A CN114705356B (en) | 2022-04-19 | 2022-04-19 | Self-calibration method of resistance strain gauge force transducer |
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