CN105890718B - Portable multi-channel flow integrating instrument field calibrator and control circuit thereof - Google Patents
Portable multi-channel flow integrating instrument field calibrator and control circuit thereof Download PDFInfo
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- CN105890718B CN105890718B CN201410751414.8A CN201410751414A CN105890718B CN 105890718 B CN105890718 B CN 105890718B CN 201410751414 A CN201410751414 A CN 201410751414A CN 105890718 B CN105890718 B CN 105890718B
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Abstract
The invention belongs to the technical field of energy metering devices, and particularly relates to a portable multichannel flow totalizer field calibrator and a control circuit thereof. The main control circuit and the output circuit realize signal interaction by adopting a communication mode, the communication circuit adopts a digital isolation communication chip ADuM1201 to quickly transmit communication instructions of the main control circuit to each output circuit, and a CPU (central processing unit) of the output circuit decodes the communication instructions according to a communication protocol to realize different output functions.
Description
Technical Field
The invention belongs to the technical field of energy metering devices, and particularly relates to a portable multichannel flow integrating meter field calibrator and a control circuit thereof.
Background
The flow totalizer is a device for calculating the flow (energy) by a related mathematical model by collecting the temperature and pressure sensor signals related to the flow, and is an important component of gas flow meters of natural gas, steam and the like. In the current times of energy crisis and increasing automation degree of industrial production, gas flow meters with flow totalizers are widely applied to various fields of industrial and agricultural production, national defense construction, scientific research and foreign trade and people's life. Natural gas and steam flow meters, as mandatory certification meters related to trade settlement, must be certified for use by legal certification authorities. Meanwhile, the accurate measurement of the gas flow has great practical significance for improving the product quality and the accuracy of scientific research data in the departments of machinery, petroleum, chemical engineering, metallurgy and the like, saving energy and improving the utilization efficiency of energy, and only the accurate measurement of the flow can realize the purposes of energy consumption and energy saving and data. Therefore, the research on the calibrator of the flow totalizer is significant.
At present, most provincial, municipal and county-level metrological verification institutions and the larger parts of power plants, chemical plants, pharmaceutical enterprises and the like are provided with flow totalizer verification devices, but the defects of large quantity and heavy weight of verification standard devices and supporting equipment generally exist. According to the JJG 1003-2005 flow totalizer verification specification, the following verification equipment is required for type evaluation, prototype test, first verification, subsequent verification and in-use verification of the flow totalizer: a standard current meter, a standard voltage meter, a universal counter, a standard resistance box, a plurality of direct current signal sources, a frequency signal generator, a millivolt generator, a regulated power supply, a timer (stopwatch), and the like. The equipment can only be used for laboratory verification, and cannot be used for site verification, and the current common verification method on site is to use two multifunctional verifiers, one resistance box and one stopwatch for verification, but the operation of the mode cannot meet the verification requirements of verification regulations.
The parameter calibration of the flow integrating instrument is carried out by five steps, instantaneous flow, accumulated flow, output current, quantitative control and compensation parameter display value.
The flow totalizer is generally installed on the spot, and when the flow totalizer is disassembled to be verified in a laboratory, a plurality of problems exist, more and more meters are required to be verified on the spot, and the on-spot verification has the following advantages: firstly, the real parameters of the instrument in the field environment can be better reflected by field verification, and if the instrument is installed on the field after laboratory verification, the deviation of the instrument can be caused by field environment factors; secondly, repeated disassembly and assembly are not needed, and artificial damage is avoided; thirdly, long-time disconnection is not needed, only temporary disconnection in the field connection in the verification process is needed, and normal continuity of production is guaranteed.
The regulation requires all equipment to be equipped, so many equipment are brought to the field, which is obviously unrealistic, leads to complex wiring and cannot ensure the synchronism of signal output, particularly, in the process of detecting the accumulated flow, a flow signal, a temperature and pressure compensation signal and three standard signals are required to be simultaneously output, and the conventional method is to carry out timing according to a stopwatch, so that on one hand, synchronous starting is difficult to realize, and on the other hand, because three different signal sources are used for continuous output at present, the last accumulated flow value is difficult to read after the timing is finished.
Disclosure of Invention
The invention aims to provide a portable multichannel flow totalizer field calibrator aiming at the defects of the prior art.
In order to realize the purpose, the portable multichannel flow totalizer field calibrator adopts the following technical scheme: the utility model provides a flow totalizer on-spot calibrator of portable multichannel, includes upper cover and lower cover, upper cover and lower cover lock become confined casing, integrated power, first output unit, second output unit, third output unit, power control unit and the measuring unit have in the casing, the surface of upper cover still is provided with the display screen that is used for showing the measuring result.
The first output unit comprises a frequency signal generator, a pulse generator, a first microprocessor, a first D/A conversion circuit, a first output signal conditioning circuit, a first direct current voltage source, a first direct current source and a first output range selection circuit, the frequency signal generator and the pulse generator are respectively electrically connected with the first microprocessor, the output end of the first microprocessor is electrically connected with the input end of the first D/A conversion circuit, the output end of the first D/A conversion circuit is electrically connected with the input end of the first output signal conditioning circuit, the output end of the first output signal conditioning circuit is respectively electrically connected with the first direct current voltage source and the input end of the first direct current source, and the output end of the first direct current source is electrically connected with the input end of the first output range selection circuit.
The second output unit comprises a second microprocessor, a second D/A conversion circuit, a second output signal conditioning circuit, a second direct current voltage source, a second direct current source and a second output range selection circuit, wherein the output end of the second microprocessor is electrically connected with the input end of the second D/A conversion circuit, the output end of the second D/A conversion circuit is electrically connected with the input end of the second output signal conditioning circuit, the output end of the second output signal conditioning circuit is respectively electrically connected with the second direct current voltage source and the input end of the second direct current source, and the output ends of the second direct current voltage source and the second direct current source are electrically connected with the input end of the second output range selection circuit.
The third output unit comprises a third microprocessor, a third D/A conversion circuit, a third output signal conditioning circuit, a third output range selection circuit, a resistance sampling circuit and a switch array circuit, wherein the output end of the third microprocessor is electrically connected with the input end of the third D/A conversion circuit, the output end of the third D/A conversion circuit is electrically connected with the input end of the third output signal conditioning circuit, the output end of the third output signal conditioning circuit is electrically connected with the input end of the third output range selection circuit, the output end of the switch array circuit is electrically connected with the input end of the resistance sampling circuit, and the output end of the resistance sampling circuit is electrically connected with the input end of the third D/A conversion circuit.
The measuring unit comprises a measuring microprocessor, an A/D converter, a sampling signal conditioning circuit, an ammeter, a voltmeter, a frequency counter, a sampling range selection circuit and a communication interface, wherein the output end of the measuring microprocessor is electrically connected with the input end of the A/D converter, three output ends of the sampling range selection circuit are respectively electrically connected with the input end of the ammeter, the input end of the voltmeter and the input end of the frequency counter, the output end of the ammeter, the output end of the voltmeter and the output end of the frequency counter are electrically connected with the input end of the sampling signal conditioning circuit, and the output end of the sampling signal conditioning circuit is electrically connected with the input end of the A/D converter; the output end of the measurement microprocessor is electrically connected with the input end of the communication interface, and the output end of the communication interface is electrically connected with the measurement port through a flat cable.
The measuring unit further comprises a timer, a storage circuit, a temperature measuring circuit, an automatic correcting circuit and a key circuit, wherein the output end of the timer, the output end of the storage circuit, the output end of the temperature measuring circuit, the output end of the automatic correcting circuit and the output end of the key circuit are electrically connected with the input end of the measuring microprocessor.
The portable multi-channel flow integrating instrument field calibrator has the advantages that: the handheld host machine has the functions of three-path standard signal output, one-path standard signal measurement, 24V voltage-stabilized power supply and the like, and simultaneously has the functions of automatic timing of a stopwatch, so that all parameters of the flow totalizer can be conveniently detected on site by a single person.
The invention also provides a control circuit of the portable multi-channel flow totalizer field calibrator, which comprises a power circuit, a main control circuit, an input circuit and an output circuit, wherein the power circuit is respectively connected with the main control circuit, the input circuit and the output circuit and supplies power to the main control circuit, the input circuit and the output circuit, the power circuit adopts an isolation module to convert the battery voltage into three isolated power supplies to respectively supply power to the three output channels independently, and the three isolated power supplies are respectively converted into each power supply required by the circuits through a switch chip.
The power supply circuit comprises a power supply module for providing positive and negative power supplies for an operational amplifier and an analog switch chip adopted in the circuit, a D/A conversion circuit, an A/D conversion circuit and a power supply circuit for supplying power to a main CPU.
The power circuit also comprises a battery charging control chip, a second pin of the battery charging control chip is a charging control end, and the charging control end is connected with the main control circuit.
And the three ways of isolation power supplies respectively adopt a high-power triode to independently control each way of isolation power supply.
The output circuit is provided with three paths, each path of output circuit comprises an output main control circuit, a D/A conversion circuit, an output signal conditioning circuit and an output signal range selection circuit, the output end of the output main control circuit is electrically connected with the input end of the D/A conversion circuit, the output end of the D/A conversion circuit is electrically connected with the input end of the output signal conditioning circuit, and the output end of the output signal conditioning circuit is electrically connected with the output signal range selection circuit.
The main control circuit comprises a signal sampling range selection circuit, a sampling signal conditioning circuit, an A/D conversion circuit, a measurement main control circuit, a key circuit and a display circuit, wherein the output end of the signal sampling range selection circuit is electrically connected with the input end of the sampling signal conditioning circuit, the output end of the sampling signal conditioning circuit is electrically connected with the input end of the A/D conversion circuit, the output end of the A/D conversion circuit is electrically connected with the input end of the measurement main control circuit, the output end of the measurement main control circuit is electrically connected with the display circuit, and the output end of the key circuit is electrically connected with the input end of the measurement main control circuit.
The control circuit of the invention has the following beneficial effects: the power circuit of the invention adopts an isolation module to convert the battery voltage into three isolated power supplies, and respectively and independently supplies power to three output channels, the three isolated power supplies are respectively converted into each power supply required by the circuit through a switch chip, so that the interaction of signals is realized between a main control circuit and an output circuit in a communication mode, the communication circuit adopts a digital isolation communication chip ADuM1201, the communication instruction of the main control circuit is quickly transmitted to each output circuit, and a CPU of the output circuit decodes the communication instruction according to a communication protocol to realize different output functions.
Drawings
FIG. 1 is a schematic diagram of the portable multi-channel flow totalizer field calibrator of the present invention.
Fig. 2 is a block diagram of a power supply circuit of the control circuit of the present invention.
Fig. 3 is a block diagram of the master control circuit of the present invention.
Fig. 4 is a block diagram of an output circuit of the control circuit of the present invention.
Included in fig. 1 to 4 are:
1-power supply circuit, 11-isolation power supply, 2-master control circuit, 21-signal sampling range selection circuit, 22-sampling signal conditioning circuit, 23-A/D conversion circuit, 24-measurement master control circuit, 25-key circuit, 26-display circuit, 3-output circuit, 31-output master control circuit, 32-D/A conversion circuit, 33-output signal conditioning circuit, 34-output signal range selection circuit, 10-upper cover, 101-display screen, 20-lower cover, 30-power supply, 40-first output unit, 401-frequency signal generator, 402-pulse generator, 403-first microprocessor, 404-first D/A conversion circuit, 405-first output signal conditioning circuit, 406-first DC voltage source, 407-first DC current source, 408-first output range selection circuit, 50-second output unit, 501-second microprocessor, 707-second D/A conversion circuit, 503-second output signal conditioning circuit, 504-second DC current source, 505-second output range selection circuit, 605-third output range selection circuit, 501-third DC voltage source, 70-sampling range selection circuit, 501-third output voltage source selection circuit, 501-second DC current source, 705-sampling range selection circuit, 501-third output unit, 704-sampling circuit, 501-third range selection circuit, 10-third output voltage source, 501-sampling range selection circuit, 70-third output voltage source, 500-third output unit, sampling circuit, and fourth output unit, 501-sampling circuit, 501-sampling range selection circuit, 704-sampling circuit, and fourth output unit, wherein, 708-communication interface, 709-timer, 710-memory circuit, 711-temperature measuring circuit, 712-automatic correction circuit, 713-key circuit, 80-power control unit.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.
Referring to fig. 1, the invention provides a portable multichannel flow totalizer field calibration device, which comprises an upper cover 10 and a lower cover 20, wherein the upper cover 10 and the lower cover 20 are buckled into a closed shell, a power supply 30, a first output unit 40, a second output unit 50, a third output unit 60, a power supply control unit 80 and a measurement unit 70 are integrated in the shell, and a display screen 101 for man-machine interaction and displaying measurement results is further arranged on the outer surface of the upper cover 10.
The first output unit 40 includes a frequency signal generator 401, a pulse generator 402, a first microprocessor 403, a first D/a conversion circuit 404, a first output signal conditioning circuit 405, a first dc voltage source 406, a first dc current source 407, and a first output range selection circuit 408, the frequency signal generator 401 and the pulse generator 402 are respectively electrically connected to the first microprocessor 403, an output end of the first microprocessor 403 is electrically connected to an input end of the first D/a conversion circuit 404, an output end of the first D/a conversion circuit 404 is electrically connected to an input end of the first output signal conditioning circuit 405, an output end of the first output signal conditioning circuit 405 is respectively electrically connected to input ends of the two first dc voltage sources 406, and output ends of the first dc voltage source 406 and the first dc current source are electrically connected to an input end 407 of the first output range selection circuit 408.
The second output unit 50 includes a second microprocessor 501, a second D/a conversion circuit 502, a second output signal conditioning circuit 503, a second dc voltage source 504, a second dc current source 505, and a second output range selection circuit 506, an output terminal of the second microprocessor 501 is electrically connected to an input terminal of the second D/a conversion circuit 502, an output terminal of the second D/a conversion circuit 502 is electrically connected to an input terminal of the second output signal conditioning circuit 503, output terminals of the second output signal conditioning circuit 503 are electrically connected to input terminals of the two second dc voltage sources 504, respectively, and output terminals of the second dc voltage source 504 and the second dc current source 505 are electrically connected to an input terminal of the second output range selection circuit 506.
The third output unit 60 includes a third microprocessor 601, a third D/a conversion circuit 602, a third output signal conditioning circuit 603, a third output range selection circuit 604, a resistance sampling circuit 605 and a switch array circuit 606, an output end of the third microprocessor 601 is electrically connected to an input end of the third D/a conversion circuit 602, an output end of the third D/a conversion circuit 602 is electrically connected to an input end of the third output signal conditioning circuit 603, an output end of the third output signal conditioning circuit 603 is electrically connected to an input end of the third output range selection circuit 604, an output end of the switch array circuit 606 is electrically connected to an input end of the resistance sampling circuit 605, and an output end of the resistance sampling circuit 605 is electrically connected to an input end of the third D/a conversion circuit 602.
The measuring unit 70 comprises a measuring microprocessor 701, an A/D converter 702, a sampling signal conditioning circuit 703, an ammeter 704, a voltmeter 705, a frequency counter 706, a sampling range selection circuit 707 and a communication interface 708, wherein the output end of the measuring microprocessor 701 is electrically connected with the input end of the A/D converter 702, three output ends of the sampling range selection circuit 707 are respectively electrically connected with the input end of the ammeter 704, the input end of the voltmeter 705 and the input end of the frequency counter 706, the output end of the ammeter 704, the output end of the voltmeter 705 and the output end of the frequency counter 706 are electrically connected with the input end of the sampling signal conditioning circuit 703, and the output end of the sampling signal conditioning circuit 703 is electrically connected with the input end of the A/D converter 702; the output end of the measurement microprocessor 701 is electrically connected with the input end of the communication interface 708, and the output end of the communication interface 708 is electrically connected with the measurement port through a flat cable.
The measuring unit 70 further comprises a timer 709, a storage circuit 710, a temperature measuring circuit 711, an automatic correction circuit 712 and a key circuit 713, wherein the output terminal of the timer 709, the output terminal of the storage circuit 710, the output terminal of the temperature measuring circuit 711, the output terminal of the automatic correction circuit 712 and the output terminal of the key circuit 713 are electrically connected with the input terminal of the measuring microprocessor 701.
Referring to fig. 2 to 4, the present invention further provides a control circuit of a portable multichannel flow totalizer field calibrator, including a power circuit 1, a main control circuit 2, an input circuit (not shown in the figures) and an output circuit 3, where the power circuit 1 is connected to the main control circuit 2, the input circuit and the output circuit 3, respectively, to supply power to the main control circuit 2, the input circuit and the output circuit 3, the power circuit 1 adopts an isolation module to convert a battery voltage into three isolated power supplies 11, which respectively supply power to the three output channels independently, and the three isolated power supplies 11 are respectively converted into each power supply required by the circuit through a switch chip.
The power supply circuit 1 includes a power supply module for supplying positive and negative power supplies to an operational amplifier and an analog switch chip used in the circuit, a D/a conversion circuit, an a/D conversion circuit, and a power supply circuit for supplying power to a main CPU. The power supply circuit provides stable working current for the instrument. In the power supply circuit of various existing calibrators (or calibrators) in the market, power supply of each circuit is realized by dividing the power supply, but mutual isolation is not performed between the power supplies, particularly, the power supplies are mutually interfered by adopting a common ground condition at a grounding end, and the output and measurement of signals are influenced; in order to ensure that the ground wires of each channel are independent and to prevent mutual interference among the ground wires in the calibrator of the flow totalizer, an isolation module is adopted by a power supply circuit to convert the voltage of a battery into three isolated power supplies, the three isolated power supplies are used for independently supplying power to three output channels respectively, and the isolated power supplies are converted into power supplies required by circuits through a switch chip, so that the scheme can effectively provide safe and interference-free power supplies for the circuits of the calibrator; for a high-voltage power supply used by an analog circuit, the LTC1945 switch chip is adopted, and two groups of positive and negative power supplies can be generated.
The power circuit 1 further comprises a battery charging control chip, a second pin of the battery charging control chip is a charging control end, and the charging control end is connected with the main control circuit 2, so that the main control circuit can monitor the charging state conveniently, and the charging state can be displayed on the display device. When the second pin of the chip is at a low level, the battery is in a charging state, and a battery icon is dynamically displayed on the display equipment; after the charging is finished, the second pin of the chip is changed into high level, and the main control circuit 2 cancels the dynamic display of the battery icon and displays the actual battery electric quantity after monitoring; the scheme is adopted, and the situation that a user still can charge by using a universal power adapter on the market without bringing or losing the standard power adapter is considered, so that the power adapter does not need to be returned to the factory for maintenance; meanwhile, due to the fact that the input voltage of the LTC1731 is high, the applicability of the power adapter is greatly improved.
The three ways of isolation power supply 11 respectively adopt a high-power triode to independently control each way of isolation power supply. When the user can meet the calibration requirement only by one or two paths, the channels which do not participate in the operation can be manually closed, so as to achieve the purpose of saving power consumption.
The output circuit 3 is provided with three paths, each output circuit comprises an output main control circuit 31, a D/A conversion circuit 32, an output signal conditioning circuit 33 and an output signal range selection circuit 34, the output end of the output main control circuit 31 is electrically connected with the input end of the D/A conversion circuit 32, the output end of the D/A conversion circuit 32 is electrically connected with the input end of the output signal conditioning circuit 33, and the output end of the output signal conditioning circuit 33 is electrically connected with the output signal range selection circuit 34. The output CPU decodes the instruction downloaded by the main control circuit, digitalizes the decoded result according to a communication protocol, transmits the digitalized signal to the D/A conversion circuit, converts the digitalized signal into an analog signal and conditions the signal according to the size of the signal; the output CPU outputs and starts the range selection electricity of the output signal according to different ranges, and outputs the conditioned signal to the socket port.
The main control circuit 2 comprises a signal sampling range selection circuit 21, a sampling signal conditioning circuit 22, an A/D conversion circuit 23, a measurement main control circuit 24, a key circuit 25 and a display circuit 26, wherein the output end of the signal sampling range selection circuit 21 is electrically connected with the input end of the sampling signal conditioning circuit 22, the output end of the sampling signal conditioning circuit 22 is electrically connected with the input end of the A/D conversion circuit 23, the output end of the A/D conversion circuit 23 is electrically connected with the input end of the measurement main control circuit 24, the output end of the measurement main control circuit 24 is electrically connected with the display circuit 26, and the output end of the key circuit 25 is electrically connected with the input end of the measurement main control circuit 24. All the man-machine exchanges and interface displays are implemented in this circuit, acting as the whole flow totalizer calibrator brain function. The instruction input by the user is decoded in the measuring circuit, corresponding display is carried out on the display equipment, and meanwhile task allocation is carried out on the decoded related functions, and the tasks are transmitted to each output channel.
In the invention, if the output of the channel 1 needs to be operated, a standard test line is inserted into an output 1 jack, and the jack adopts an aviation socket and is provided with a positive and negative polarity guide groove; the current working state is set to the channel 1 by pressing the F1 key, then the F1 key is pressed to enter a channel 1 setting interface, a specific output range is selected by entering an output range column according to the actual working requirement, functions such as stepping, slope and percentage setting can be selected in a function option column, and after the interface is pressed to prompt exit from the setting interface, a specific output signal can be input by pressing a number key in a main working interface, and a confirmation key is pressed for output. The specific operation can be referred to an instruction manual.
In the invention, if the output of the channel 2 needs to be operated, a standard test line is inserted into an output 2 jack, and the jack adopts an aviation socket and is provided with a positive and negative polarity guide groove; pressing the F2 key to set the current working state to the channel 2, then pressing the F2 key to enter the channel 2 setting interface, entering the output range column according to the actual working requirement to select the specific output range, and selecting the functions of stepping, slope, percentage setting and the like in the function option column, after pressing the interface prompt to quit the setting interface, pressing the number keys in the main working interface to input the specific output signal, and pressing the confirmation key to output. The specific operation can be referred to an instruction manual.
In the invention, if the output of the channel 3 needs to be operated, a standard test line is inserted into an output 3 jack, and the jack adopts an aviation socket and is provided with a positive and negative polarity guide groove; pressing the F3 key to set the current working state to the channel 3, then pressing the F3 key to enter the channel 3 to set the interface, entering the output range column to select the specific output range according to the actual working requirement, and selecting the functions of stepping, slope, percentage setting and the like in the function option column, after pressing the interface to prompt to quit the setting interface, pressing the number keys in the main working interface to key in the specific output signal, and pressing the confirmation key to output. The specific operation can be referred to an instruction manual.
If the measuring channel needs to be operated, the standard testing line is inserted into the measuring jack, and the jack adopts an aviation socket and is provided with a positive and negative polarity guiding groove; pressing the F4 key to set the current working state to the measuring channel, then pressing the F4 key to enter the setting interface of the measuring channel, entering the measuring range column to select the specific measuring range according to the actual working requirement, and selecting the functions of maximum/minimum/average and percentage setting in the function option column, and after the interface is pressed to prompt to quit the setting interface, the specific external input signal can be measured in the main working interface. The specific operation can be referred to an instruction manual.
In the invention, all output functions and measurement functions need to be corrected in a laboratory when being delivered from a factory, and can be delivered from the factory under the condition of meeting the precision index; the user side can only carry out correction by obtaining the authorization of a manufacturer; selecting a correction function column in the main menu of the instrument, typing in a correction password, displaying various correction function menus on the display interface of the instrument, and selecting different correction channels and measuring ranges to be corrected to realize correction.
For the correction of the output signal, a corrector only needs to key in the reading of the current standard table, and the internal correction software of the instrument automatically calculates the correction coefficient of the current correction point, stores the correction coefficient into the internal memory, and automatically tracks and outputs the corrected result in real time so as to conveniently check the corrected result.
For the correction of the measurement signal, a corrector only needs to key the data of the currently input standard signal into a data column in the current display interface, after a confirmation key is pressed, the correction coefficient of the current correction point is automatically calculated by correction software in the instrument and stored in a same memory, the correction coefficient takes effect immediately, and the current measurement signal is tracked and compensated in real time, so that the measurement correction result is convenient to view.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (6)
1. The portable multichannel flow totalizer field calibrator comprises an upper cover and a lower cover, wherein the upper cover and the lower cover are buckled into a closed shell, and the portable multichannel flow totalizer field calibrator is characterized in that: a power supply, a first output unit, a second output unit, a third output unit, a power supply control unit and a measurement unit are integrated in the shell, and a display screen for man-machine interaction and measurement result display is further arranged on the outer surface of the upper cover;
the first output unit comprises a frequency signal generator, a pulse generator, a first microprocessor, a first D/A conversion circuit, a first output signal conditioning circuit, a first direct current voltage source, a first direct current source and a first output range selection circuit; the frequency signal generator and the pulse generator are respectively connected with the first microprocessor circuit, the output end of the first microprocessor is electrically connected with the input end of the first D/A conversion circuit, the output end of the first D/A conversion circuit is electrically connected with the input end of the first output signal conditioning circuit, the output end of the first output signal conditioning circuit is respectively electrically connected with the first direct current voltage source and the input end of the first direct current source, and the output ends of the first direct current voltage source and the first direct current source are electrically connected with the input end of the first output range selection circuit;
the second output unit comprises a second microprocessor, a second D/A conversion circuit, a second output signal conditioning circuit, a second direct current voltage source, a second direct current source and a second output range selection circuit, wherein the output end of the second microprocessor is electrically connected with the input end of the second D/A conversion circuit, the output end of the second D/A conversion circuit is electrically connected with the input end of the second output signal conditioning circuit, the output end of the second output signal conditioning circuit is respectively electrically connected with the second direct current voltage source and the input end of the second direct current source, and the output ends of the second direct current voltage source and the second direct current source are electrically connected with the input end of the second output range selection circuit;
the third output unit comprises a third microprocessor, a third D/A conversion circuit, a third output signal conditioning circuit, a third output range selection circuit, a resistance sampling circuit and a switch array circuit, wherein the output end of the third microprocessor is electrically connected with the input end of the third D/A conversion circuit, the output end of the third D/A conversion circuit is electrically connected with the input end of the third output signal conditioning circuit, the output end of the third output signal conditioning circuit is electrically connected with the input end of the third output range selection circuit, the output end of the switch array circuit is electrically connected with the input end of the resistance sampling circuit, and the output end of the resistance sampling circuit is electrically connected with the input end of the third D/A conversion circuit;
the measuring unit comprises a measuring microprocessor, an A/D converter, a sampling signal conditioning circuit, an ammeter, a voltmeter, a frequency counter, a sampling range selecting circuit and a communication interface, wherein the output end of the measuring microprocessor is electrically connected with the input end of the A/D converter, three output ends of the sampling range selecting circuit are respectively electrically connected with the input end of the ammeter, the input end of the voltmeter and the input end of the frequency counter, the output end of the ammeter, the output end of the voltmeter and the output end of the frequency counter are electrically connected with the input end of the sampling signal conditioning circuit, and the output end of the sampling signal conditioning circuit is electrically connected with the input end of the A/D converter; the output end of the measurement microprocessor is electrically connected with the input end of the communication interface, and the output end of the communication interface is electrically connected with the measurement port through a flat cable.
2. The portable multichannel flow totalizer field calibrator according to claim 1, wherein: the measuring unit further comprises a timer, a storage circuit, a temperature measuring circuit, an automatic correcting circuit and a key circuit, wherein the output end of the timer, the output end of the storage circuit, the output end of the temperature measuring circuit, the output end of the automatic correcting circuit and the output end of the key circuit are electrically connected with the input end of the measuring microprocessor.
3. The control circuit applied to the portable multichannel flow totalizer field calibrator as defined in any one of claims 1-2, comprising a power circuit, a master control circuit, an input circuit and an output circuit, wherein the power circuit is respectively connected with the master control circuit, the input circuit and the output circuit to supply power to the master control circuit, the input circuit and the output circuit, and the control circuit is characterized in that: the power circuit adopts an isolation module to convert the battery voltage into three isolated power supplies, the three isolated power supplies respectively supply power to three output channels, and the three isolated power supplies are respectively converted into each power supply required by the circuit through a switch chip.
4. The control circuit of claim 3, wherein: the power supply circuit comprises a power supply module for providing positive and negative power supplies for an operational amplifier and an analog switch chip adopted in the circuit, a D/A conversion circuit, an A/D conversion circuit and a power supply circuit for supplying power to a main CPU.
5. The control circuit of claim 3, wherein: the output circuit is provided with three paths, each path of output circuit comprises an output main control circuit, a D/A conversion circuit, an output signal conditioning circuit and an output signal range selection circuit, the output end of the output main control circuit is electrically connected with the input end of the D/A conversion circuit, the output end of the D/A conversion circuit is electrically connected with the input end of the output signal conditioning circuit, and the output end of the output signal conditioning circuit is electrically connected with the output signal range selection circuit.
6. The control circuit of claim 3, wherein: the main control circuit comprises a signal sampling range selection circuit, a sampling signal conditioning circuit, an A/D conversion circuit, a measurement main control circuit, a key circuit and a display circuit, wherein the output end of the signal sampling range selection circuit is electrically connected with the input end of the sampling signal conditioning circuit, the output end of the sampling signal conditioning circuit is electrically connected with the input end of the A/D conversion circuit, the output end of the A/D conversion circuit is electrically connected with the input end of the measurement main control circuit, the output end of the measurement main control circuit is electrically connected with the display circuit, and the output end of the key circuit is electrically connected with the input end of the measurement main control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410751414.8A CN105890718B (en) | 2014-12-03 | 2014-12-03 | Portable multi-channel flow integrating instrument field calibrator and control circuit thereof |
Applications Claiming Priority (1)
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