CN112097820A - Calibration box of analog signal transmitter - Google Patents
Calibration box of analog signal transmitter Download PDFInfo
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- CN112097820A CN112097820A CN202010909970.9A CN202010909970A CN112097820A CN 112097820 A CN112097820 A CN 112097820A CN 202010909970 A CN202010909970 A CN 202010909970A CN 112097820 A CN112097820 A CN 112097820A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
- G01D18/008—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00 with calibration coefficients stored in memory
Abstract
The invention discloses a calibration box of an analog signal transmitter, which comprises a key panel and a singlechip signal generating circuit, wherein the singlechip signal generating circuit is used for receiving each command sent by the key panel and sending signals corresponding to each command to the singlechip circuit of the analog signal transmitter. The calibration box provided by the invention can realize remote calibration of the analog signal transmitter, and does not need to disassemble an equipment adjusting potentiometer to calibrate the transmitter, so that the calibration is simpler and the efficiency is higher. The calibration box and the calibration method of the analog signal transmitter provided by the invention can repeatedly calibrate and are accurate in calibration. The calibration box provided by the invention can be applied to transmitters with various pure analog quantity outputs.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a calibration box of an analog signal transmitter.
Background
With the development of industrial automation technology, many devices need to measure and monitor pressure, temperature, distance, etc. in real time using a transmitter. The output signal of the transmitter includes two categories of analog signals (voltage, current) and digital signals. Transmitters generally need to be calibrated or calibrated during use to meet accuracy requirements under different use environments.
The digital transmitter is usually internally provided with a singlechip and a storage unit, can directly communicate through a communication interface, directly modifies characteristic parameters set in a program of the digital transmitter and stores the setting in a chip of the storage unit, thereby realizing the calibration of the digital transmitter. As shown in fig. 1, the conventional analog signal transmitter has an internal circuit block diagram, and since the analog signal transmitter only has an analog output, the analog signal transmitter can change the characteristic parameter of the analog signal transmitter only by means of manual adjustment of a potentiometer.
Analog signal transmitters have the disadvantages of: the analog signal transmitter has no communication interface, can not remotely calibrate, and must manually adjust the potentiometer by hand, and the analog signal transmitter is usually installed in the equipment when in use, and once the potentiometer of the analog signal transmitter can not be contacted by people is installed, even if the analog signal transmitter is calibrated when being installed for the first time, the analog signal transmitter can be adjusted by still disassembling the equipment when signal calibration is carried out in the later period, so that the existing analog signal transmitter has great inconvenience in use. In addition, most of the devices using analog input have no digital communication interface, and cannot use a digital communication mode.
Disclosure of Invention
The invention aims to provide a calibration box of an analog signal transmitter, which overcomes the defects of the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention discloses a calibration box of an analog signal transmitter, which comprises a key panel and a singlechip signal generating circuit, wherein the singlechip signal generating circuit is used for receiving each command sent by the key panel and sending signals corresponding to each command to the singlechip circuit of the analog signal transmitter.
As one preferable scheme of the invention, at least zero point, full scale, zero setting, saving and fine adjustment output command keys are arranged on the key panel.
As one preferable scheme of the invention, the signal sent by the single chip microcomputer signal generating circuit is at least a grounding signal or a frequency signal.
As one of the preferable schemes of the invention, the singlechip circuit of the analog signal transmitter is connected with the calibration box through an input signal line.
Further preferably, a universal input/output port of the one-chip microcomputer circuit of the analog signal transmitter is provided as a signal input port, and one end of the input signal line is connected to the signal input port.
As one of the preferable schemes of the invention, the calibration method of the analog signal transmitter comprises the following steps:
and pressing a key of the control box, outputting a signal to the singlechip circuit of the analog signal transmitter by the singlechip signal generating circuit of the control box, and identifying the signal by the singlechip circuit of the analog signal transmitter so as to calibrate the parameter of the characteristic curve function of the analog signal transmitter according to the signal and calculate the digital signal transmitted by the analog-to-digital conversion circuit of the analog signal transmitter according to the calibrated characteristic curve function.
Preferably, after the analog signal transmitter is initialized, the single chip signal generating circuit of the calibration box enters a polling key signal state, after the key of the calibration box is pressed, the single chip signal generating circuit of the calibration box receives a key command and pulls down an output signal, and the signal is output to the single chip circuit of the analog signal transmitter.
Further preferably, the single chip microcomputer circuit of the analog signal transmitter assigns the sensor signal sampling data read by the single chip microcomputer circuit to parameters of a characteristic curve function of the analog signal transmitter according to different signals, stores the parameters, and guides the parameters into the characteristic curve function of the analog signal transmitter to calculate the digital signals transmitted by the analog-to-digital conversion circuit.
Further preferably, after the analog signal transmitter is initialized, a signal port interrupt program of the one-chip microcomputer circuit of the analog signal transmitter starts to wait for a signal pulse, after the frequency signal/ground signal pulse is received, the timer starts to time, after the frequency signal/ground signal disappears, the time is finished, then the type of the frequency signal/ground signal is judged according to the frequency/duration, and the read sensor signal sampling data is assigned to different parameters.
Compared with the prior art, the invention has the advantages that:
the calibration box provided by the invention can realize remote calibration of the analog signal transmitter, and does not need to disassemble an equipment adjusting potentiometer to calibrate the transmitter, so that the calibration is simpler and the efficiency is higher.
The calibration box and the calibration method of the analog signal transmitter provided by the invention can repeatedly calibrate and are accurate in calibration.
The calibration box provided by the invention can be applied to transmitters with various pure analog quantity outputs.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a block diagram of the internal circuitry of a prior art analog signal transmitter;
FIG. 2 is a circuit diagram of an analog signal transmitter according to embodiment 1 of the present invention;
fig. 3 is a circuit connection diagram of the calibration box disclosed in embodiment 1 of the present invention;
FIG. 4 is a flowchart of a calibration method of an analog signal transmitter disclosed in embodiment 1 of the present invention;
FIG. 5 is a circuit diagram of the analog signal transmitter disclosed in embodiment 2 of the present invention;
fig. 6 is a circuit connection diagram of the calibration box disclosed in embodiment 2 of the present invention;
fig. 7 is a flowchart of a calibration method of an analog signal transmitter disclosed in embodiment 2 of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention discloses a calibration box of an analog signal transmitter, which comprises a key panel and a single chip microcomputer signal generating circuit, wherein the single chip microcomputer signal generating circuit is used for receiving all commands sent by the key panel and sending signals corresponding to all the commands to a single chip microcomputer circuit of the analog signal transmitter; the analog signal transmitter comprises a filtering amplification and analog-digital conversion circuit, a single chip microcomputer circuit and a digital-analog conversion circuit which are sequentially and electrically connected, wherein the single chip microcomputer circuit is provided with a signal input channel used for inputting a grounding signal to the single chip microcomputer circuit, the single chip microcomputer circuit is at least used for calibrating parameters of a characteristic curve function of the analog signal transmitter after the grounding signal is input to the single chip microcomputer circuit, and calculating a digital signal transmitted by the analog-digital conversion circuit according to the calibrated characteristic curve function, the filtering amplification and analog-digital conversion circuit receives an original signal sent by a sensor, and the digital-analog conversion circuit is used for converting the digital signal after calibration calculation into an analog signal to be output.
As one preferable scheme of the invention, at least zero point, full scale, zero setting, saving and fine adjustment output command keys are arranged on the key panel.
As one preferable scheme of the invention, the signal sent by the single chip microcomputer signal generating circuit is at least a grounding signal or a frequency signal.
As one of the preferable schemes of the invention, the singlechip circuit of the analog signal transmitter is connected with the calibration box through an input signal line.
Further preferably, a universal input/output port of the one-chip microcomputer circuit of the analog signal transmitter is provided as a signal input port, and one end of the input signal line is connected to the signal input port. Specifically, the universal input/output port of the single chip microcomputer circuit is provided with two signal input ports, the two signal input ports are respectively connected with two input signal lines for inputting grounding signals, and the two signal input ports and the two input signal lines form a signal input channel; or, the universal input/output port of the single chip circuit is set as a signal input port, the signal input port is connected with an input signal line for inputting a frequency signal, and the signal input port and the input signal line form a signal input channel.
As one of the preferable schemes of the present invention, the single chip microcomputer circuit specifically includes a signal filtering processing unit, a calibration algorithm unit and a ground signal identification unit, wherein the ground signal identification unit is configured to identify an input ground signal, the signal filtering processing unit is configured to perform smoothing filtering processing on the input ground signal, and the calibration algorithm unit is configured to assign the sensor signal sampling data read by the ground signal identification unit to a parameter of a characteristic curve function of the analog signal transmitter according to the ground signals of different lengths, and store the parameter and introduce the parameter into the characteristic curve function of the analog signal transmitter to calculate a digital signal transmitted by the analog-to-digital conversion circuit.
As one of the preferable schemes of the invention, the calibration method of the analog signal transmitter comprises the following steps: and pressing a key of the control box, outputting a signal to the singlechip circuit of the analog signal transmitter by the singlechip signal generating circuit of the control box, and identifying the signal by the singlechip circuit of the analog signal transmitter so as to calibrate the parameter of the characteristic curve function of the analog signal transmitter according to the signal and calculate the digital signal transmitted by the analog-to-digital conversion circuit of the analog signal transmitter according to the calibrated characteristic curve function.
Preferably, after the analog signal transmitter is initialized, the single chip signal generating circuit of the calibration box enters a polling key signal state, after the key of the calibration box is pressed, the single chip signal generating circuit of the calibration box receives a key command and pulls down an output signal, and the signal is output to the single chip circuit of the analog signal transmitter.
Further preferably, the single chip microcomputer circuit of the analog signal transmitter assigns the sensor signal sampling data read by the single chip microcomputer circuit to parameters of a characteristic curve function of the analog signal transmitter according to different grounding signals/frequencies, stores the parameters, and guides the parameters into the characteristic curve function of the analog signal transmitter to calculate the digital signals transmitted by the analog-to-digital conversion circuit.
Still further preferably, after the analog signal transmitter is initialized, a signal port interrupt program of the one-chip microcomputer circuit of the analog signal transmitter starts to wait for a signal pulse, after the frequency signal/ground signal pulse is received, a timer starts to time, after the frequency signal/ground signal disappears, the time is completed, the type of the frequency signal/ground signal is judged according to the frequency/duration, and the read sensor signal sampling data is assigned to different parameters.
Through the technical scheme, the calibration box provided by the invention can realize remote calibration of the analog signal transmitter, and does not need to disassemble an equipment adjusting potentiometer to calibrate the transmitter, so that the calibration is simpler and the efficiency is higher; the calibration box and the calibration method of the analog signal transmitter provided by the invention can repeatedly calibrate and are accurate in calibration; the calibration box provided by the invention can be applied to transmitters with various pure analog quantity outputs.
The technical solution of the present invention is further explained below with reference to the specific examples 1-2 and the accompanying drawings:
referring to fig. 2, embodiment 1 of the present invention discloses an analog signal transmitter and a calibration box, wherein, the analog signal transmitter comprises a filtering amplification and analog-digital conversion circuit 1 (i.e. an integrated circuit of a filtering amplifier and an analog-digital conversion circuit), a singlechip circuit 2 and a digital-analog conversion circuit 3 which are sequentially and electrically connected, the singlechip circuit 2 is provided with a signal input channel for inputting a grounding signal to the singlechip circuit, the singlechip circuit 2 is at least used for calibrating the parameter of the characteristic curve function of the analog signal transmitter after the grounding signal is input to the singlechip circuit, and calculating the digital signal transmitted by the analog-digital conversion circuit according to the calibrated characteristic curve function, the filtering amplification and analog-digital conversion circuit 1 is used for converting an input original signal into a digital signal through amplification, and the digital-analog conversion circuit 3 is used for converting a digital signal after calibration calculation into an analog signal to be output.
The universal input/output port of the single chip is provided with two signal input ports, the two signal input ports are respectively connected with two input signal lines for inputting grounding signals, and the two signal input ports and the two input signal lines form a signal input channel.
The singlechip circuit specifically comprises a signal filtering processing unit, a calibration algorithm unit and a grounding signal identification unit, wherein the grounding signal identification unit is used for identifying an input grounding signal,
the signal filtering processing unit is used for carrying out smooth filtering processing on the input grounding signals, and the calibration algorithm unit is used for assigning the sensor signal sampling data read by the signal filtering processing unit to the parameters of the characteristic curve function of the analog signal transmitter according to the grounding signals with different lengths, storing the parameters and leading the parameters into the characteristic curve function of the analog signal transmitter so as to calculate the digital signals transmitted by the analog-to-digital conversion circuit.
The ground signal is input to the single chip circuit by a calibration box connected with an input signal line, the calibration box comprises a key panel 4 and a single chip ground signal generating circuit 5, and the key panel 4 can input different calibration commands, such as the most common functions of zero point, full scale, zero setting, storage and fine adjustment output. The singlechip grounding signal generating circuit 5 is used for receiving each command sent by the key panel and sending a grounding signal corresponding to each command to the singlechip of the sensor. The square wave signal is simple to generate and has strong anti-interference capability, so that long-distance transmission can be realized.
As shown in fig. 3-4, the embodiment of the present invention further discloses a method for calibrating a ground signal of the analog signal transmitter, which includes the following steps:
the sensor sends original signals to the analog signal transmitter, a button on a button panel of the calibration box is pressed to input a command to a singlechip grounding signal generating circuit of the calibration box, the singlechip grounding signal generating circuit of the calibration box correspondingly inputs grounding signals with different time lengths to the singlechip circuit of the analog signal transmitter through an input signal line according to the received command, meanwhile, after the analog signal transmitter is initialized, a signal port interrupt program of the singlechip circuit starts to wait for signal pulses, after the grounding signal pulses are received, a timer starts to time, after the grounding signals disappear, and the input grounding signals are judged by counting the grounding time lengths. Two input signal lines are used for connecting the calibration box and the singlechip circuit of the analog signal transmitter, wherein one signal line is a zero signal line, one signal line is a full signal line, the two input signal lines are respectively used for inputting a grounding signal corresponding to the zero and a grounding signal corresponding to the full, and other commands can be set to be input through any input signal line. For example, zero corresponds to line a grounded for 4 seconds, full corresponds to line B grounded for 4 seconds, hold corresponds to line B grounded for 11 seconds, set zero to line a grounded for 11 seconds, and output fine adjustment a + B to maintain grounded.
Firstly, a grounding signal identification unit of a singlechip circuit of the analog signal transmitter identifies an input grounding signal, then a signal filtering processing unit carries out smooth filtering processing on the input grounding signal and sensor signal sampling data, then a calibration algorithm unit assigns the sensor signal sampling data read by the calibration algorithm unit to parameters of a characteristic curve function of the analog signal transmitter according to different grounding signals (different grounding signals correspond to different sensor signal sampling data), stores the parameters, introduces the parameters into the characteristic curve function of the analog signal transmitter to calculate a digital signal transmitted by an analog-to-digital conversion circuit, and finally converts the digital signal after calibration calculation into the analog signal through the digital-to-analog conversion circuit for output.
For example, the most common function of the characteristic linear curve of the pressure transmitter is Y = kx + b, two steps of command inputs of zero and full scale values are performed in the calibration process, the single chip circuit records x and Y values at the zero and full scale (i.e. when a grounding signal corresponding to the zero is input, sensor signal sampling data x1 and Y1 are recorded, and when a grounding signal corresponding to the full scale is input, sensor signal sampling data x2 and Y2 are recorded), two groups of x and Y values are used as transition parameters for calculating K and b, and K and b are parameters of the characteristic curve function, after the calibration is finished, pressing a storage key to automatically store K and b so as to obtain the calibrated characteristic curve function, namely finishing the assignment of the sensor signal sampling data to the parameters of the characteristic curve function, the digital signal can be accurately calculated through the calibrated characteristic curve function, and then an accurate analog output value (analog signal) is output.
Example 2:
referring to fig. 5, embodiment 2 of the present invention discloses an analog signal transmitter and a calibration box, wherein, the analog signal transmitter comprises a filtering amplification and analog-digital conversion circuit 1 ' (a filtering amplifier, an analog-digital conversion circuit), a singlechip circuit 2 ' and a digital-analog conversion circuit 3 ' which are electrically connected in turn, the singlechip circuit 2 ' is provided with a signal input channel for inputting frequency signals to the singlechip circuit, the singlechip circuit 2 ' is at least used for calibrating parameters of a characteristic curve function of the analog signal transmitter after the frequency signals are input to the singlechip circuit, and calculating digital signals transmitted by the analog-digital conversion circuit according to the calibrated characteristic curve function, the filtering amplification and analog-digital conversion circuit 1 'is used for converting an input original signal into a digital signal through amplification, and the digital-analog conversion circuit 3' is used for converting a digital signal after calibration calculation into an analog signal to be output.
The universal input/output port of the single chip circuit is set as a signal input port, the signal input port is connected with an input signal line for inputting a frequency signal, and the signal input port and the input signal line form a signal input channel.
The singlechip circuit specifically comprises a signal filtering processing unit, a calibration algorithm unit and a frequency signal identification unit, wherein the frequency signal identification unit is used for identifying an input frequency signal,
the signal filtering processing unit is used for carrying out smooth filtering processing on the input frequency signals, and the calibration algorithm unit is used for assigning the sensor signal sampling data read by the signal filtering processing unit to the parameters of the characteristic curve function of the analog signal transmitter according to different frequency signals, storing the parameters and leading the parameters into the characteristic curve function of the analog signal transmitter so as to calculate the digital signals transmitted by the analog-digital conversion circuit.
The frequency signal is input to the singlechip circuit by a calibration box connected with an input signal line, the calibration box comprises a key panel 4 ' and a singlechip frequency signal generating circuit 5 ', and the key panel 4 ' can input different calibration commands, such as the most common functions of zero point, full scale, zero setting, storage and fine adjustment output. The singlechip frequency signal generating circuit 5' is used for receiving each command sent by the key panel and sending square wave signals with the frequency corresponding to each command to the singlechip of the sensor. The square wave signal is simple to generate and has strong anti-interference capability, so that long-distance transmission can be realized.
As shown in fig. 6 to 7, the embodiment of the present invention further discloses a frequency signal calibration method of the analog signal transmitter, which includes the following steps:
the sensor sends original signals to the analog signal transmitter, a key on a key panel of the calibration box is pressed to input a command to a singlechip frequency signal generating circuit of the calibration box, the singlechip frequency signal generating circuit of the calibration box correspondingly inputs frequency signals with different frequencies to the singlechip circuit of the analog signal transmitter according to the received command, meanwhile, after the analog signal transmitter is initialized, a signal port interrupt program of the singlechip circuit starts to wait for signal pulses, after the frequency signal pulses are received, a timer starts to time, and after the time is finished, the frequency of the frequency signals is judged by counting the number of the received pulses. For example, zero corresponds to an a hertz signal, full corresponds to a B hertz signal, a corresponding C hertz signal is stored, zero corresponds to a D hertz signal, and a fine adjustment corresponding E hertz signal is output.
Firstly, a frequency signal identification unit of a singlechip circuit of the analog signal transmitter identifies an input frequency signal, then a signal filtering processing unit carries out smooth filtering processing on the input frequency signal, then a calibration algorithm unit assigns sensor signal sampling data read from an analog-to-digital conversion circuit to parameters of a characteristic curve function of the analog signal transmitter according to different frequency signals (different frequency signals correspond to different sensor signal sampling data), stores the parameters, introduces the parameters into the characteristic curve function of the analog signal transmitter to calculate a digital signal transmitted by the analog-to-digital conversion circuit, and finally converts the digital signal after calibration calculation into the analog signal through a digital-to-analog conversion circuit and outputs the analog signal.
For example, the most common function of the characteristic linear curve of the pressure transmitter is Y = kx + b, two steps of command input of zero and full scale values are performed during calibration, the single chip circuit records x and Y values at zero and full scale (i.e., when a frequency signal corresponding to zero is input, sensor signal sampling data x1 and Y1 are recorded, and when a frequency signal corresponding to full scale is input, sensor signal sampling data x2 and Y2 are recorded), two sets of x and Y values are used as transition parameters for calculating K and b, after the calibration is finished, pressing a storage key to automatically store K and b so as to obtain the calibrated characteristic curve function, namely finishing the assignment of the sensor signal sampling data to the parameters of the characteristic curve function, the digital signal can be accurately calculated through the calibrated characteristic curve function, and then an accurate analog output value (analog signal) is output.
Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The utility model provides a demarcation box of analog signal changer which characterized in that: the calibration box comprises a key panel and a single chip microcomputer signal generating circuit, wherein the single chip microcomputer signal generating circuit is used for receiving all commands sent by the key panel and sending signals corresponding to all the commands to the single chip microcomputer circuit of the analog signal transmitter.
2. The calibration box of an analog signal transmitter of claim 1, wherein: and the key panel is at least provided with zero, full, zero setting, storage and fine adjustment output command keys.
3. The calibration box of an analog signal transmitter of claim 1, wherein: the signal sent by the single chip microcomputer signal generating circuit is at least a grounding signal or a frequency signal.
4. The calibration box of an analog signal transmitter of claim 1, wherein: the single chip circuit of the analog signal transmitter is connected with the calibration box through an input signal line.
5. The calibration box of an analog signal transmitter as set forth in claim 4, wherein: a universal input/output port of a single chip circuit of the analog signal transmitter is set as a signal input port, and one end of an input signal wire is connected with the signal input port.
6. Calibration box for an analog signal transmitter according to any of claims 1-5, characterized in that: the calibration method of the analog signal transmitter comprises the following steps:
and pressing a key of the control box, outputting a signal to the singlechip circuit of the analog signal transmitter by the singlechip signal generating circuit of the control box, and identifying the signal by the singlechip circuit of the analog signal transmitter so as to calibrate the parameter of the characteristic curve function of the analog signal transmitter according to the signal and calculate the digital signal transmitted by the analog-to-digital conversion circuit of the analog signal transmitter according to the calibrated characteristic curve function.
7. The calibration box of an analog signal transmitter of claim 6, wherein: after the analog signal transmitter is initialized, the single chip microcomputer signal generating circuit of the calibration box enters a polling key signal state, after a key of the calibration box is pressed, the single chip microcomputer signal generating circuit of the calibration box receives a key command and pulls down an output signal, the signal is output to the single chip microcomputer circuit of the analog signal transmitter, meanwhile, the single chip microcomputer signal generating circuit of the calibration box starts timing, after the timing is finished, the single chip microcomputer signal generating circuit of the calibration box pulls up the output signal, and the single chip microcomputer signal generating circuit of the calibration box finishes signal output.
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| US20030174068A1 (en) * | 2002-03-15 | 2003-09-18 | Dobos Jeffrey A. | Apparatus for calibrating a digital field sensor |
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