CN210638731U - On-line automatic metering and calibrating instrument - Google Patents

Abstract

The utility model discloses an online automatic measurement calibrator, this instrument is including being used for providing the synchronous locking signal who corresponds locking digital signal n and producing the unit for when receiving synchronous locking digital signal n, locking measuring value Y this moment to carry out calibration the control unit (3) that compare measuring value Y and preset calibration value X, be used for right coming from the comparative result data of calibration the control unit (3) carry out analysis processes, calculate the calibration coefficient, realize calibration process's calibration coefficient unit (2) and be used for receiving the receiving and dispatching instruction unit (4) of calibration order. The utility model discloses need not the calibration personnel and get into the job site, need not to carry under the condition of measurement calibration, the cooperation is used for receiving the receiving and dispatching instruction unit of calibration order, has realized the purpose of online automatic calibration.

Description

On-line automatic metering and calibrating instrument

Technical Field

The utility model relates to an online automatic measurement calibration instrument.

Background

The field measurement calibration service does not need to disassemble and assemble the measuring instrument, does not need equipment to stop running and production, does not influence normal production, can greatly reduce calibration workload, saves time and cost, and is popular with measuring instrument use units. The current field measurement calibration mainly comprises a bypass substitution calibration method, a standard signal source calibration method and a time online automatic calibration method. Its advantages and disadvantages are as follows:

bypass alternate calibration as shown in fig. 1, the calibrated instrument and the bypass valve are mounted on the same pipe of the medium being measured. During calibration, a calibration device is connected to the bypass valve, and the bypass valve is opened to ensure that the instrument to be calibrated and the calibration device measure the same measured quantity. And simultaneously reading the measured values measured by the calibrated instrument and the calibrating device, and replacing the indicating value of the calibrated instrument with the actual measured value of the calibrating device to achieve the aim of calibration. The method has the advantages that the instrument to be calibrated and the calibrating device measure the same measured value, and the accuracy of the measured value at the time of measurement is objectively and accurately reflected. The method has the disadvantages that the measured value is an instantaneous value, the calibration value can not be set according to the requirement of a calibration method, the calibration point is single, the whole measurement range can not be calibrated, and personnel are required to enter a working site to replace and install a standard measurement device on a side road, so that the workload is large, and the time and the labor are wasted. In particular, the calibration method is often used in chemical, metallurgical, electric and coal enterprises for on-site calibration of pressure, temperature, flow and flow rate. The environment of the calibration site is typically: high temperature, high fever, high corrosive gas, many places have flammable easy explosive harmful gas, replace installation standard measuring device under this adverse environmental condition, not only adapting unit is easy to damage, still has great safety risk.

Standard signal source calibration as shown in fig. 2, the instrument being calibrated is measured by measuring the secondary loop signal. During calibration, the secondary circuit is disconnected with the calibrated instrument, the calibrated instrument is connected into the calibration device, and the calibration device provides the analog standard measurement value. And reading the actual value of the corresponding instrument to be calibrated at the moment, comparing the difference between the actual value and the theoretical value corresponding to the input analog standard measurement value, and calibrating the indicating value of the instrument to be calibrated by using the theoretical value. The method has the advantage that the whole measuring range can be calibrated according to the requirement of the calibration method. The defects are that errors generated by a measuring sensor and a transmitter can not be reflected correctly, and a standard measuring device is required to be installed on site, so that the workload is large, and time and labor are wasted. In particular, the calibration method is often used in chemical, metallurgical, electric, building material, machinery and coal enterprises for on-site calibration of voltage, current, power, temperature and flow. The environment of the calibration site is typically: high voltage, high magnetic field, high heat, the harmful gas that easily fires explosive exists in many places, replaces to install standard measuring device under this adverse environmental condition, and not only adapting unit is damaged easily, still has great safety risk.

The time online automatic calibration method is shown in fig. 3, and the calibrated instrument is connected with a national time service center through a wired or wireless network. During calibration, synchronous update of the calibrated instrument and the standard time of the national time service center is realized by operating the calibrated instrument, and the standard time of the national time service center is used for replacing the indicating value of the calibrated instrument to realize the calibration purpose. The method has the advantages of realizing on-line calibration in the true sense, no need of manual intervention, safety, high efficiency and low calibration cost. The method has the defects that the calibration standard provided by the national time service center is single, only a few parameters such as time, frequency, displacement and the like can be used for calibration, and the method cannot be widely applied.

To sum up, the field calibration method adopted by the current general article needs a calibrator to enter a high-temperature, high-pressure and high-corrosive gas working field to perform calibration work, and the calibration standard measuring device is disassembled and assembled on the field, which still wastes time and labor, easily causes damage to the connecting part, and has a significant safety risk.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the existing field calibration, the aim of the instrument is to provide an online automatic metering and calibrating instrument which can solve the problems of large workload, time and labor waste, high calibration cost, easy equipment damage and great safety risk caused by the fact that a calibrator needs to install a calibration standard under the severe environment condition on the spot when the current field metering and calibrating is carried out.

In order to achieve the object of the present invention, the on-line automatic metering and calibrating apparatus provided herein comprises a locking signal generating unit for providing a synchronous corresponding locking digital signal n; the calibration control unit is used for locking the current measurement value Y when receiving the synchronous locking digital signal n and comparing the measurement value Y with a preset calibration value X; the calibration coefficient unit is used for analyzing and processing the comparison result data from the calibration control unit, calculating a calibration coefficient and realizing a calibration process; and a transceiving instruction unit for receiving the calibration command.

Further, the utility model provides a calibration instrument still includes the protection control unit for when non-calibration, cut off the power of locking signal production unit.

Further, the locking signal generating unit comprises a calibration sensor for acquiring a measurement value of the instrument to be calibrated and providing a synchronous corresponding locking digital signal n to the calibration control unit.

Further, when the measured value obtained by the calibration sensor is equal to a preset calibration value X, a synchronous corresponding locking digital signal n is provided to the calibration control unit.

Further, the locking signal generating unit includes an analog standard unit, the analog standard unit automatically generates a series of calibration standard signal values of the preset calibration point in an analog manner, and each time one calibration standard signal value is generated, the analog standard unit correspondingly sends out a synchronous locking digital signal n to the calibration control unit.

Further, the lock signal generating unit includes: the calibration sensor is used for acquiring the measurement value of the instrument to be calibrated and providing a synchronous corresponding locking digital signal n for the calibration control unit; and the analog standard unit automatically generates a series of calibration standard signal values of preset calibration points in an analog mode, and when one calibration standard signal value is generated, the analog standard unit correspondingly sends a synchronous locking digital signal n to the calibration control unit.

Further, the utility model provides a calibration instrument still includes the measuring signal unit that carries out filtering, enlargies, anti-interference, AD conversion and calculation processing and/or be used for human-computer interaction's demonstration record cell to the measured value.

The beneficial effects of the utility model include:

1) the utility model provides an instrument is from taking calibration system unit, need not the calibration personnel and get into the job site, need not to carry under the condition of measurement calibration, the cooperation is used for receiving the receiving and dispatching instruction unit of calibration order, the purpose of online automatic calibration has been realized, current on-the-spot measurement calibration has been solved, the work load that needs the calibration personnel to install the calibration standard under the abominable environmental condition in scene is big, waste time and energy, calibration cost is high, damage equipment easily and have the problem of great safety risk.

2) The locking signal generating unit is utilized to realize accurate control of calibration, and the design of one or more measuring points which are specially required to be calibrated in the instrument measuring range provided by the utility model can be realized without the requirement of full range meeting the calibration requirement, the input and output are not required to be in linear relation or proportional relation, and even the measurement of other points except the calibration points is not required; this not only reduces the requirements of the manufacturing technique and process, but also reduces the manufacturing cost requirements.

3) Utilize calibration sensor when the measured value equals the calibration value, output signal makes the measured value that calibration control unit locking work sensor acquireed, only to the calibration point, has improved the measuring accuracy grade, makes the utility model provides an instrument measuring accuracy grade is superior to work needs 1 level or 2 levels, satisfies the calibration needs simultaneously, and the incremental cost is not many, for this utility model wide application, provides feasible technique and cost guarantee.

4) The analog standard unit is used for generating analog standard signals, so that the measurement accuracy level is provided for calibration, 1-level or more than 2-level analog standard signals higher than the normal measurement working level are realized, and the scientificity, accuracy and reliability of calibration work are ensured.

5) The power supply of the locking signal generating unit is cut off by the protection control unit when the on-line measuring instrument is not calibrated, the long-term invalid work of the locking signal generating unit is avoided, the locking signal generating unit is isolated from being contacted with a calibrated instrument, the corrosion aging process of the locking signal generating unit is lightened, the locking signal generating unit is ensured, the measuring accuracy grade provided for calibration is higher than the normal measuring operation accuracy grade by 1 grade or more than 2 grade, the standard signal required by quantity value transmission is met, the necessary technical guarantee is provided for the automatic calibration of the on-line measuring instrument, and meanwhile the service life is prolonged.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic diagram illustrating the field installation and connection of a device under test and a calibration apparatus when a prior bypass calibration method is used to perform field measurement calibration services;

FIG. 2 is a schematic diagram of the connection between the measured instrument and the calibration device during the on-site measurement calibration service using the standard signal calibration method;

FIG. 3 is a schematic diagram showing the connection between the measured instrument and the calibration device via the Internet when the time on-line automatic calibration method is currently used to perform the on-line measurement calibration service;

FIG. 4 is a block diagram of a design module and a workflow of a bypass replacement calibration method implemented by the calibration apparatus provided by the present invention;

fig. 5 is a block diagram of a design module and a workflow of a standard signal source calibration method implemented by the calibration instrument of the present invention;

FIG. 6 illustrates a combined design module and workflow block corresponding to the bypass substitution calibration method and the standard signal source calibration method;

in the drawings: the device comprises a working sensor, a 2-calibration coefficient unit, a 3-calibration control unit, a 4-transceiving instruction unit, a 5-calibration sensor, a 6-protection control unit, a 7-analog standard unit, a 8-measurement signal unit, a 9-display recording unit and a 10-change-over switch.

Detailed Description

The claimed invention will now be described in further detail with reference to the accompanying drawings and examples.

Example 1

The on-line automatic metering calibration instrument provided by the example comprises a locking signal generation unit, a calibration unit and a control unit, wherein the locking signal generation unit is used for providing synchronous corresponding locking digital signals n; the calibration control unit 3 is used for locking the current measurement value Y when receiving the synchronous locking digital signal n and comparing the measurement value Y with a preset calibration value X; the calibration coefficient unit 2 is used for analyzing and processing the comparison result data from the calibration control unit 3, calculating a calibration coefficient and realizing a calibration process; and a transceiver unit 4, configured to receive a calibration command, where the calibration command may be sent by the calibration control unit 3, or may be a remote terminal, such as a server, a cloud, or a computer in a control center; when the remote terminal sends the control instruction, the control instruction is transmitted to the receiving and sending instruction unit 4 through the internet or the internet of things.

Example two

The on-line automatic metering and calibrating instrument provided by the example comprises all technical features of the on-line automatic metering and calibrating instrument provided by the example, and further comprises a protection control unit 6 for cutting off the power supply of the locking signal generating unit when the instrument is not calibrated.

The lock signal generation unit described in the first and second examples adopts the following three structures:

the first method comprises the following steps: a calibration sensor 5 is included for acquiring the measured values of the instrument to be calibrated and providing a synchronous corresponding lock digital signal n to the calibration control unit 3. When the measured value obtained by the calibration sensor 5 is equal to the preset calibrated value X, the synchronous corresponding lock digital signal n is provided to the calibration control unit 3.

And the second method comprises the following steps: the digital calibration device comprises an analog standard unit 7, wherein the analog standard unit 7 automatically generates a series of calibration standard signal values of preset calibration points in an analog mode, and when each calibration standard signal value is generated, the analog standard unit 7 correspondingly sends a synchronous locking digital signal n to a calibration control unit 3.

And the third is that: the device comprises a calibration sensor 5, a calibration control unit 3 and a control unit, wherein the calibration sensor is used for acquiring the measurement value of an instrument to be calibrated and providing a synchronous corresponding locking digital signal n for the calibration control unit; and the analog standard unit 7 is used for automatically simulating and generating a series of calibration standard signal values of preset calibration points, and when each calibration standard signal value is generated, the analog standard unit 7 correspondingly sends a synchronous locking digital signal n to the calibration control unit 3.

In addition to the above three structures, the lock signal generating unit may also adopt other structures.

The working principle of the instrument is as follows: under a certain condition, locking the obtained measurement value Y, comparing the error of the measurement value Y with the preset calibration value X, calculating and judging whether the calibration coefficient needs to be modified again, within a certain allowable error range, not modifying, exceeding the allowable calibration error range, modifying the standard coefficient to obtain a correct measurement value, and completing calibration.

Wherein, under certain conditions: 1) a locked measurement condition in which the measured value is exactly equal to a preset calibration value X; 2) refers to the condition that the analog signal value is exactly equal to the measurement value locked by the calibration standard signal value corresponding to the preset calibration value X.

In addition, the calibration instrument provided in example one or example two further comprises one or two of the following functional units: the device also comprises a measurement signal unit 8 for filtering, amplifying, resisting interference, A/D converting and calculating the acquired measurement value of the instrument to be calibrated; 2. a display recording unit 9 for human-computer interaction is also included.

The utility model provides a calibration instrument can use current bypass to replace the calibration method, or standard signal source calibration method, or the bypass replaces calibration method and standard signal source calibration method to realize treating the calibration instrument's calibration, here respectively with the utility model provides a bypass that calibration instrument corresponds replaces calibration method, standard signal source calibration method and bypass and replaces calibration method and standard signal source calibration method combination to design, and concrete scheme is as follows:

1. the design module and the workflow block diagram corresponding to the bypass substitution calibration method are shown in fig. 4. At this moment the utility model provides an instrument includes work sensor 1, calibration coefficient unit 2, standard control unit 3, receiving and dispatching instruction unit 4, calibration sensor 5, protection control unit 6, measuring signal unit 8 and demonstration record cell 9.

When the device is used, the calibration sensor 5 and the working sensor 1 are arranged at the same position of the same measured object, the instrument provided by the utility model is arranged in a working site or an instrument control room, and the instrument transceiving instruction unit 4 provided by the utility model is connected with the Internet or the Internet of things in a wireless or wired mode, is controlled by a remote computer or an intelligent instrument, and realizes online calibration; the utility model provides an instrument divide into two kinds of normal measurement mode and calibration measurement mode in this bypass substitution calibration method.

In the normal measurement mode, the calibration control unit 3, the protection control unit 6 and the calibration sensor 5 of the instrument work in default low power consumption states. The measuring signal of the calibrated instrument is obtained by measuring through the working sensor 1, the measuring signal is input into the standard coefficient unit 2 after being calculated and processed through the measuring signal unit 8, and is input into the display recording unit 9 after being calibrated through the calibration coefficient unit 2, and the real-time measuring value output by the working sensor 1 is displayed and recorded.

Receive the calibration instruction that the internet was assigned or after the instrument was from the calibration order of setting for as receiving and dispatching instruction unit 4, the utility model provides an automatic calibration measurement mode that gets into of instrument. The utility model provides an instrument at first starts calibration the control unit 3, through 6 switch-ons calibration sensor 5 of protection the control unit, makes it be in operating condition. At this time, the working sensor 1 is also in the working state, and the working sensor 1 and the calibration sensor 5 simultaneously measure the same measured value. When the measured value is just equal to the preset calibration value X at a certain moment, the calibration sensor 5 outputs a locking trigger control digital signal n to the calibration control unit 3, the calibration control unit 3 locks the measured value Y measured by the working sensor 1 at the moment, the measured value Y is compared with the preset calibration value X stored in the memory of the calibration control unit 3, the (Y-X) error is calculated, whether the calibration coefficient needs to be modified again is judged, the calibration coefficient is modified by the calibration coefficient unit 2 within a certain allowable error range without modification, and the calibration allowable error range is exceeded without modification, so that the correct value is obtained, and the automatic calibration work is completed. And after the calibration is finished, automatically switching to a normal measurement mode, and waiting for a next calibration instruction.

The calibration sensor 5 may be designed to issue different lock trigger lock digital signals n corresponding to one or more magnitudes, depending on the calibration requirements. For example, a calibration sensor is produced, when the measured pressure values are exactly equal to 1MPa,5MPa and 10MPa, the corresponding output locking trigger locking digital signals n are 1, 2 and 3, and the digital signals are not output when the corresponding other measured pressure values are corresponding. The calibration control unit 3 correspondingly retrieves preset calibration values X (columns such as 1MPa,5MPa,10 MPa) stored in the memory according to the value of the locking digital signal n, compares the preset calibration values X with locking measurement values Y (columns such as 1.1MPa, 4.9MPa, 10.2MPa) obtained by the measurement of the working sensor at the time, calculates (Y-X) errors, and determines whether the calibration coefficients need to be modified again to complete automatic calibration work. And after the calibration is finished, automatically switching to a normal measurement mode, and waiting for a next calibration instruction.

2. A design module and a workflow block diagram corresponding to the standard signal source calibration method are shown in fig. 5. At this moment the utility model provides an instrument includes calibration coefficient unit 2, calibration the control unit 3, receives and dispatches the command unit 4, protection the control unit 6, the analog standard unit 7, the measuring signal unit 8 and shows record cell 9.

When in use, the instrument provided by the utility model is connected in a secondary loop of a measuring system, and the instrument is installed in a working site or an instrument control room, the receiving and sending instruction unit 4 in the instrument provided by the utility model is connected with the internet or the internet of things in a wireless or wired mode, receives the control of a remote computer or an intelligent instrument, and realizes online calibration; the instrument is divided into a normal measurement mode and a calibration measurement mode.

Under the normal measurement mode, the utility model provides a calibration the control unit 3, protection the control unit 6, the work of simulation standard unit 7 of instrument is in acquiescence low-power consumption state, is handled the back by the measured value through sensor secondary circuit, inputs measuring signal unit 8, by calibration coefficient unit 2 calibration back, inputs and shows record cell 9, shows real-time measured value and record.

When the transceiving instruction unit 4 receives a calibration instruction issued by the internet or a self-set calibration command of the instrument, the instrument automatically enters a calibration measurement mode. The utility model provides an instrument at first starts calibration the control unit 3, opens protection device through protection the control unit 6, cuts off being connected of instrument and secondary circuit through change over switch 10. And simultaneously, let the utility model provides an instrument input circuit switches to be connected with simulation standard cell 7, and the instrument measurement value changes the standard signal production that is provided by simulation standard cell 7. The calibration control unit 3 controls the analog standard unit 7 to generate a series of calibration standard signal values X (theoretical measurement values corresponding to the calibration standard signal values X1, X2, and X3 are X1, X2, and X3) of preset calibration points, and each time a preset calibration standard signal value is generated, the analog standard unit 7 correspondingly transmits a locking control digital signal n (1, 2, and 3) to the calibration control unit 3, and the calibration control unit 3 locks an actual display value Y (Y1, Y2, and Y3) generated corresponding to the preset calibration standard signal value at the moment. Comparing the locked actual display value (Y) (Y1, Y2, Y3) with the difference (Yi-Xi) of the theoretical value (X) (X1, X2, X3) corresponding to the calibration standard signal value (X) in the storage unit of the calibration control unit 3, calculating and judging whether the calibration coefficient needs to be modified again, and modifying by the calibration coefficient unit (2) to obtain a correct measurement value within a certain allowable error range without modification and exceeding the allowable error range of calibration, thereby completing the automatic calibration. And after the calibration is finished, automatically switching to a normal measurement mode, and waiting for a next calibration instruction.

3. The combined design module and the workflow block diagram of the corresponding bypass substitution calibration method and the standard signal source calibration method are shown in fig. 6. At this moment the utility model provides an instrument includes work sensor 1, calibration coefficient unit 2, calibration control unit 3, receiving and dispatching instruction unit 4, calibration sensor 5, protection control unit 6, analog standard unit 7, measuring signal unit 8, demonstration record unit 9 and change over switch 10.

The combination form of the bypass substitution calibration method and the standard signal source calibration method is adopted in the structure, and the using method, the installation method and the calibration method are the combination of the bypass substitution calibration method and the standard signal source calibration method respectively for the calibration instrument provided by the utility model.

Here, each functional unit is explained in detail as follows:

1) calibration coefficient unit

The unit mainly comprises an initial calibration data memory, an erasable dynamic calibration data memory, a range calibration processor and the like. The initial calibration data memory stores default calibration data when leaving the factory, including initial calibration coefficients, initial setting values, calculation formula constants, or table data sets of an input/output lookup table method, and the like. And after the erasable dynamic calibration data memory stores the current calibration, the erasable dynamic calibration data memory provides the current measurement calibration for use corresponding to the updating data of the initial calibration data type. The range calibration processor analyzes and processes the data from the calibration control unit 3, calculates a full-range calibration coefficient through calibration calculation of specific one-point or multi-point measurement data, or searches a data group of a comparison table to realize range calibration, writes the data group into the erasable dynamic calibration data memory for storage, and completes the calibration process.

2) Calibration control unit

The unit mainly comprises a control instruction analysis processor, a measuring range calibration controller, a calibration standard data processor and the like. The control instruction analysis processor is used for analyzing and processing the instruction and the calibration feedback data from the instruction receiving and transmitting unit 4, and realizing the bidirectional communication between the instrument measurement calibration data and the internet control data. The range calibration controller controls the automatic calibration of the range, the generation sequence of the analog standard signals and the automatic opening and closing operation of the protection device according to a time program or a network control instruction preset by the instrument, and the management of the automatic calibration function is realized. The calibration standard data processor receives the measurement data processed by the calibration coefficient unit 2 and the signals of the calibration sensor 5 or the analog standard unit 7, stores theoretical values corresponding to preset calibration points, and controls the transceiving instruction unit 4 or the calibration coefficient unit 2 or the protection control unit 6 or the analog standard unit 7 to work after comparison, calculation, analysis and processing.

3) Transmit-receive instruction unit

The functions of receiving, sending, setting, storing and the like of the control instruction are mainly realized.

4) Calibrating a sensor

The sensor is generally composed of a single or a plurality of constant value detecting elements. The calibration sensor in the utility model is made of special material or special circuit to form a customized calibration sensor; it is characterized by that only for the measured value a one-to-one locking digital signal n is produced on the known specific value, so that it can be accurately known that the measured value is exactly equal to the known value, and the difference value of measured value and known value of the measuring system is compared, so that the calibration coefficient can be determined, and the measuring system can be calibrated. For example, a constant value calibration sensor is manufactured by utilizing the piezoelectric effect principle and is used for being matched with an online automatic calibration intelligent instrument with the measurement range of 0 MPa-10 MPa. The assumption is that a sensor can be manufactured, when the measured pressure values are 1MPa,5MPa and 10MPa, stable and reliable 4mA, 6mA and 9mA currents or other locking digital signals n (1, 2 and 3) can be accurately and correspondingly output, the accuracy and the repeatability meet the calibration requirements, and whether the corresponding relation is a linear relation or a proportional relation is not required. For the remaining measured pressure values, there may not even be any requirement for the corresponding output of the sensor. Such a sensor can be used as a fixed value calibration sensor.

It follows that it is technically perfectly possible to make the calibration sensor with special materials or special circuitry. The constant value calibration sensor for the accurate effect of a specific numerical value can be designed by utilizing the physical characteristics of common piezoelectric effect, magnetic resistance effect, Hall effect, photoelectric effect, Doppler effect and the like and combining the physical characteristics with a resonant circuit. Because the calibration is generally only to the single or a plurality of definite value calibration of characteristics in the measuring range, need not calibrate all values of full range, can adopt special measures to improve the measurement accuracy of definite value calibration sensor, reliability and stability, make it satisfy the calibration needs that the measurement accuracy grade is superior to job sensor 1 level or 2 levels simultaneously, greatly reduced the cost of preparation definite value calibration sensor, and the incremental cost is little, provide the standard value that satisfies the on-the-spot calibration needs, thereby guarantee that the calibration result is accurate reliable, for the utility model provides a wide application scene.

5) Protection control unit

The unit mainly comprises a circuit protection execution device, a physical isolation execution device, a circuit wiring conversion device and the like. Under the normal measurement condition, the circuit protection execution device cuts off the power supply of the calibration sensor 5 or the analog standard unit 7, so that the long-term invalid work of the calibration sensor is avoided, the aging of elements is accelerated, and the measurement accuracy and stability are reduced; the physical isolation execution device isolates the calibration sensor 5 from the contact with the measured object in a physical mode, so that the long-term severe environment conditions of the sensor on the site such as high temperature, high heat, high corrosion and the like are avoided, the aging of elements is accelerated, and the measurement accuracy and stability are reduced; the circuit wiring conversion device is connected with the circuit and the measuring sensor and is in a normal measuring connection state. Under the calibration condition, the circuit protection execution device switches on the power supply of the calibration sensor 5 or the analog standard unit 7, and switches on the physical isolation execution device to enable the calibration sensor 5 to be in contact with the measured object, so as to enter a calibration measurement state. The on-line automatic calibration intelligent instrument designed by the standard signal source calibration method cuts off the connection between the line and the measurement sensor through the circuit wiring conversion device, simultaneously switches on the connection between the line and the analog standard unit 7, generates an analog standard calibration signal by the analog standard calibration signal, and enters a calibration measurement state.

6) Analog standard cell

The unit is typically made up of a single or multiple standard signal generating circuits. The method is characterized in that each standard signal generating circuit correspondingly generates a known calibration standard signal (X1, X2, X3) with a specific numerical value, theoretical measured values (X1, X2, X3) are correspondingly generated when the signals pass through a measuring system, and error calibration coefficients of the measuring system are determined by comparing the difference between the measured values (Y1, Y2, Y3) and the theoretical values (X1, X2, X3) of the measuring system, so that calibration of the measuring system is realized.

It is very common in the art to make standard signal generating circuits using special circuits. Such as a common standard voltage current signal generator, a standard resistance generator, a standard pressure generator, and so forth. With the rapid development of electronic technology, the cost for manufacturing the standard signal generating circuit is lower and lower, the accuracy, reliability and stability of the standard signal of the circuit can be conveniently improved, the on-site calibration requirement is met, and therefore the accuracy and reliability of the calibration result are guaranteed. Currently, it is a trend to calibrate devices in the field by embedding a standard signal generating circuit as a calibration unit of an intelligent instrument, which is not only technically feasible, but also adds little cost to the manufacture of the instrument.

7) Measuring signal unit

The functions of filtering, amplifying, anti-interference, A/D conversion, calculation and the like of signals are mainly realized.

8) Display recording unit

The functions of data display, setting, recording, storage, transmission, alarming, printing and the like are mainly realized.

The on-line automatic metering calibration instrument shown in fig. 4 is generally used in a direct-measurement working environment. The on-line automatic metering calibration instrument shown in fig. 5 is generally used in an indirect measurement working environment.

There are two calibration modes:

1. auto-metering calibration mode

According to the calibration requirement, in combination with the field working condition, the field worker presets the start or end time, calibration parameters and calibration range of the instrument calibration through key operation by adding keys in the instrument transceiving instruction unit 4 through a man-machine interaction device. When the working time of the instrument reaches the set time, automatically entering a calibration mode, and automatically measuring and calibrating the preset parameters and measuring ranges; after calibration is completed, the instrument automatically switches to measurement mode.

2. Network metering calibration mode

According to the working requirement, the control room staff is connected with the instrument through a wired or wireless internet to control the calibration of the instrument in real time. The control room staff can select the calibration parameters and the calibration range according to the current field working condition, and control the calibration process in real time. After the calibration is completed, the instrument is controlled to switch to the measurement mode.

As another aspect, the present application also provides a computer readable medium carrying one or more programs which, when executed by a computer, implement the approval method provided by the present invention.

The utility model provides a computer readable medium can save in any kind of electronic equipment, in order to constitute the utility model provides a calibration instrument includes in the electronic equipment:

one or more processors; and a storage device for storing one or more programs, which when executed by the one or more processors, cause the one or more processors to implement an online automatic metering calibration method as provided by the present invention, thereby constituting a calibration instrument as provided by the present invention.

The utility model discloses the calibration value of predetermineeing that records is saved in calibration sensor 5 or is saved in calibration the memory of the control unit 3, can be single value or a set of value, can realize the internet through receiving and dispatching instruction unit 4 and revise. The calibration standard signal values recorded are stored in advance in the memory of the calibration control unit 3, and internet modification can be realized through the transceiving instruction unit 4.

It should be noted that the computer readable medium of the present invention can be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present invention, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.

The units described in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, and the described units may also be disposed in a processor. Wherein the names of the elements do not in some way constitute a limitation on the elements themselves.

It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functions of two or more modules or units described above may be embodied in one module or unit according to embodiments of the invention. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.

Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a mobile hard disk, etc.) or on a network, and includes a plurality of instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of the present invention.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims (7)

1. An on-line automatic metrology calibration instrument, the calibration instrument comprising:

a lock signal generating unit for providing a synchronous corresponding lock digital signal n;

a calibration control unit (3) for locking the measurement value Y at this time when receiving the synchronous locking digital signal n, and comparing the measurement value Y with a preset calibration value X;

the calibration coefficient unit (2) is used for analyzing and processing the comparison result data from the calibration control unit (3), calculating a calibration coefficient and realizing a calibration process; and

and the transceiving instruction unit (4) is used for receiving the calibration command.

2. The on-line automatic metrology calibration instrument of claim 1, wherein: the device also comprises a protection control unit (6) which is used for cutting off the power supply of the locking signal generating unit when the device is not calibrated.

3. The on-line automatic metrology calibration instrument of claim 1 or 2, wherein: the locking signal generating unit comprises a calibration sensor (5) for acquiring a measurement value of the instrument to be calibrated and providing a synchronous corresponding locking digital signal n to the calibration control unit (3).

4. The on-line automatic metrology calibration instrument of claim 3, wherein: and when the measured value acquired by the calibration sensor (5) is equal to a preset calibration value X, providing a synchronous corresponding locking digital signal n to the calibration control unit (3).

5. The on-line automatic metrology calibration instrument of claim 1 or 2, wherein: the locking signal generating unit comprises an analog standard unit (7), the analog standard unit (7) automatically simulates and generates a series of calibration standard signal values of preset calibration points, and each time one calibration standard signal value is generated, the analog standard unit (7) correspondingly sends out a synchronous locking digital signal n to the calibration control unit (3).

6. The on-line automatic metrology calibration instrument of claim 1 or 2, wherein: the lock signal generating unit includes:

the calibration sensor (5) is used for acquiring the measurement value of the instrument to be calibrated and providing a synchronous corresponding locking digital signal n for the calibration control unit (3);

the analog standard unit (7) automatically simulates and generates a series of calibration standard signal values of preset calibration points, and when each calibration standard signal value is generated, the analog standard unit (7) correspondingly sends a synchronous locking digital signal n to the calibration control unit (3).

7. The on-line automatic metrology calibration instrument of claim 1 or 2, wherein: the device also comprises a measurement signal unit (8) for filtering, amplifying, resisting interference, A/D conversion and calculation processing of the measurement value and/or a display recording unit (9) for man-machine interaction.

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