CN115185953A - Direct current stabilized power supply automatic calibration system based on LabVIEW development platform - Google Patents

Abstract

The invention discloses a direct current stabilized power supply automatic calibration system based on a LabVIEW development platform, which comprises a hardware part and a software part. The hardware part comprises a voltmeter, an I/V converter, an electronic load and an alternating current voltage regulator; the alternating current voltage regulator provides input voltage for the direct current power supply to be tested; the electronic load is used as the output load of the tested direct current power supply; the voltmeter calibrates the voltage setting precision, the voltage readback precision, the load voltage regulation rate, the source voltage regulation rate and the voltage ripple of the tested direct-current power supply; the I/V converter and the voltmeter are matched to calibrate the current setting precision, the current read-back precision, the load current regulation rate and the source current regulation rate of the direct current power supply to be tested. The software part comprises a database, an automatic calibration system main body program and a certificate record template file. The invention controls the measurement standard and the tested equipment in the system through the program design and the computer communication interface, and completes the functions of data acquisition, processing and storage, certificate record making and the like.

Description

Direct current stabilized power supply automatic calibration system based on LabVIEW development platform

Technical Field

The invention relates to the technical field of automatic calibration, in particular to an automatic calibration system for a direct-current stabilized power supply based on a LabVIEW development platform.

Background

Through market research, the development and the use of the direct-current stabilized power supply automatic calibration system are not common in the current domestic relatively-known metering service providing mechanism, and the development platform comprises software compiling environments such as VC,. NET, VB, labVIEW and the like; the calibration system has a relatively narrow use environment and is limited to a certain specific type of high-power supply; meanwhile, the automation degree of the calibration system is low, and a calibration certificate and a calibration record cannot be generated in a one-key mode.

Disclosure of Invention

The invention aims to provide a direct-current stabilized power supply automatic calibration system based on a LabVIEW development platform, which aims to solve the problems in the background art.

In order to solve the technical problem, the invention provides a direct current stabilized power supply automatic calibration system based on a LabVIEW development platform, which comprises a hardware part and a software part;

the hardware part comprises:

the voltmeter is used as a measurement standard for calibrating the voltage setting precision, the voltage readback precision, the load voltage regulation rate, the source voltage regulation rate and the voltage ripple of the measured direct-current power supply;

the I/V converter is matched with the voltmeter to serve as a measurement standard, and the current setting precision, the current read-back precision, the load current regulation rate and the source current regulation rate of the direct current power supply to be measured are calibrated;

the electronic load is used as the output load of the tested direct current power supply;

the alternating current voltage regulator is used as a power supply voltage and provides stable input voltage for the direct current power supply to be tested;

the software portion includes a database, an automated calibration system, and a certificate record template file.

In one embodiment, the database includes 12 data relationship tables: an equipment model data sheet, a channel range data sheet, an equipment calibration information base data sheet, a voltage setting precision data sheet, a voltage readback precision data sheet, a current setting precision data sheet, a current readback precision data sheet, a constant voltage source effect data sheet, a constant current source effect data sheet, a constant voltage load effect data sheet, a constant current load effect data sheet and a ripple noise data sheet; the channel range field of the 12 data relationship tables adopts a double-field coding mode, namely a power supply model field and a channel range field.

In one embodiment, the automatic calibration system is developed based on a LabVIEW platform, is composed of VI programs and comprises a main module, sub-modules and a support module;

the main module comprises a system login module, an information input module, a calibration information selection module, a system initialization module, a system implementation progress module and a system single-channel range calibration implementation module which are sequentially connected;

the sub-modules comprise a voltage setting value calibration module, a current setting value calibration module, a voltage measurement value calibration module, a current measurement value calibration module, a constant voltage load effect calibration module, a constant current load effect calibration module, a constant voltage source effect calibration module, a constant current load effect calibration module and a ripple noise calibration module which are all connected with the system single-channel range calibration implementation module;

the support module includes:

the calibration record inquiring and generating module is connected with the information input module;

the calibration information display, selection and elimination module is connected with the calibration information selection module;

the calibration system self-checking module and the calibration system addressing module are connected with the system initialization module;

the calibration certificate, the record initialization module, the calibration certificate and the record output module are all connected with the system implementation progress module;

and the uncertainty calculation module, the system communication configuration module and the data reduction module are all connected with the system single-channel range calibration implementation module.

In one embodiment, the system login module implements login of an automated calibration system, and the login process includes:

setting a login account and a password character string;

initializing a global variable;

entering an information input interface if the login information is correct; otherwise, the user cannot enter the system.

In one embodiment, the information input module is matched with the calibration record query and generation module to realize the input, query and display of calibration information;

the calibration information comprises 12 items of contents including the model of the equipment to be calibrated, the name of the equipment to be calibrated, a manufacturer, calibration time, the serial number of the equipment to be calibrated, the asset number of the equipment, an entrusting party, the address of the entrusting party, the serial number of a certificate record, the ambient temperature, the relative humidity and remarks; the name of the equipment to be calibrated, the manufacturer and the calibration time are automatically filled in by a program, and other contents need to be manually input.

In one embodiment, the calibration information selection module cooperates with the calibration information display, selection and elimination module to select and determine a power source range channel to be calibrated according to the power source range information received from the information entry module.

In one embodiment, the system initialization module cooperates with the calibration system self-test module and the calibration system addressing module, performs addressing access for the communication device, starts device self-test, and determines whether to continue to perform calibration according to a device self-test status.

In one implementation mode, the system implementation progress module is matched with the calibration certificate, the record initialization module, the calibration certificate and the record output module to realize calibration certificate and record initialization, and the processing progress is displayed in real time through a progress bar;

manufacturing a calibration certificate and a recording template by using excel, and carrying out layout according to the measuring range of each channel of the direct-current power supply to be tested; during actual calibration, sequentially and respectively implementing calibration according to the range of each channel of the tested direct-current power supply;

the calibration certificate is made by the following method: according to the channel range information coding technology of the tested direct current power supply, the channel range information of the device to be calibrated is called out from a database, and then the channel range of the device to be calibrated is determined.

In one embodiment, the single-channel range calibration implementation module of the system respectively starts 9 sub-modules to complete corresponding calibration according to a calibration procedure for a single-channel range; and carrying out data reduction on the returned data, and writing the data into a corresponding data area of the generated certificate record.

In one implementation mode, the 9 submodules adjust test parameters from the database according to a calibration procedure for a single range channel, respectively utilize a communication program control technology to calibrate 9 items of tested equipment, complete data sampling for 6 times at each measuring point, eliminate abnormal measuring data according to a Grabbs criterion, average effective measuring data and calculate uncertainty, and return to a system single-channel range calibration implementation module;

according to the calibration requirement of the DC power supply to be tested, the 9 items are divided into two types: a voltage type and a current type, and specifying a wiring pattern for each type calibration; wherein, the first and the second end of the pipe are connected with each other,

the voltage class calibration items include: voltage setting precision, voltage readback precision, source voltage effect, load voltage effect and ripple noise;

the current-based calibration items include: current setting accuracy, current readback accuracy, source current effect, load current effect.

The direct-current stabilized power supply automatic calibration system based on the LabVIEW development platform has the following beneficial effects:

(1) The overall time consumption of automatic calibration is averagely lower than 50% of the overall time consumption of manual calibration, and the overall efficiency is improved by 1 time;

(2) According to the self characteristics of the automatic system, the certificate and the record template of any equipment have uniqueness, and the maintenance and the change are very simple;

(3) By utilizing automatic calibration equipment, most of various direct current stabilized power supply models on the market can be theoretically covered within the capacity range.

Drawings

FIG. 1 is a schematic diagram of the principle of an automated calibration system for a direct current stabilized power supply based on a LabVIEW development platform provided by the invention;

FIG. 2 is a schematic diagram of a 12-piece data relationship table for a database design;

FIG. 3 is a schematic diagram of a main body program of the automated calibration system;

FIG. 4 is a general flow diagram of a system login module;

FIG. 5 is a general flow diagram of an information entry module;

FIG. 6 is a block diagram of an exemplary process for database reading;

FIG. 7 is a schematic diagram of an exemplary process for state machine control;

FIG. 8 is a general flow diagram of a calibration information selection module;

FIG. 9 is a general flow diagram of a system initialization module;

FIG. 10 is an exemplary block diagram of a communication device access;

FIG. 11 is an exemplary block diagram of a process for automatic identification of communication addresses;

FIG. 12 is an exemplary block diagram of an automatic configuration of a communication serial port;

FIG. 13 is a general flow diagram of a system implementation progress module;

FIG. 14 is a typical flow diagram of an ActiveX call process;

FIG. 15 is a schematic diagram of an excel production calibration certificate and recording template layout;

FIG. 16 is a sub-module general flow diagram;

FIG. 17 is a schematic diagram of a connection pattern of current-based calibration items;

FIG. 18 is a schematic diagram of a voltage class calibration item connection pattern;

FIG. 19 is a graphical comparison of time-consuming data for automated and manual calibration as a whole.

Detailed Description

The following describes in detail a dc stabilized power supply automatic calibration system based on LabVIEW development platform according to the present invention with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

The invention provides a direct current stabilized power supply automatic calibration system based on a LabVIEW development platform, which can realize calibration items including voltage setting precision, voltage readback precision, current setting precision, current readback precision, load regulation rate, source voltage regulation rate and ripple; the calibration method is based on JJF1597-2016 DC stabilized power supply calibration standard. The automatic calibration system is mainly divided into two parts of hardware and software:

as shown in fig. 1, the hardware part includes a standard voltmeter, an I/V converter, a standard electronic load, and an ac voltage regulator; the alternating current voltage regulator is used as a power supply voltage and provides stable input voltage for the direct current power supply to be tested; the standard electronic load is used as an output load of the tested direct current power supply; the standard voltmeter is used as a measurement standard and is used for calibrating the voltage setting precision, the voltage readback precision, the load voltage regulation rate, the source voltage regulation rate and the voltage ripple of the direct-current power supply to be measured; the I/V converter is matched with a standard voltmeter to serve as a measurement standard and is used for calibrating the current setting precision, the current read-back precision, the load current regulation rate and the source current regulation rate of the direct current power supply to be measured.

The software part comprises a database (Access), an automatic calibration system main body program (LabVIEW) and a certificate record template file (Excel); the database adopts a currently mainstream relational database Access, and 12 data relational tables are designed in total, as shown in fig. 2, which respectively include: an equipment model data sheet, a channel range data sheet, an equipment calibration information base data sheet, a voltage setting precision data sheet, a voltage readback precision data sheet, a current setting precision data sheet, a current readback precision data sheet, a constant voltage source effect data sheet, a constant current source effect data sheet, a constant voltage load effect data sheet, a constant current load effect data sheet and a ripple noise data sheet; the channel range field of the 12 data relationship tables adopts a double-field coding mode, namely a power supply model field and a channel range field.

The device model data table mainly comprises 8 information fields such as a device model, a device name, a manufacturer, a device communication interface type, serial port communication flag data bit setting, device self-checking feedback information and the like; the channel range data table mainly comprises 6 information fields of 'equipment model', 'channel name', 'range', 'SCPI program control command' and the like; the data table of the equipment calibration information base mainly comprises 16 information fields of equipment model, equipment manufacturer, equipment serial number, calibration certificate record name, calibration certificate record number and the like; the voltage setting accuracy data table mainly comprises 14 information fields such as channel name, maximum rated value of output power, maximum rated value of output voltage, voltage setting value, voltage setting accuracy and bias and the like; the data sheet of voltage readback precision mainly comprises 16 information fields of channel name, maximum rated value of output power, maximum rated value of output voltage, voltage readback resolution, voltage readback precision and bias and the like; the current setting accuracy data table mainly comprises 14 information fields such as channel name, maximum rated value of output power, maximum rated value of output current, current setting value, current setting accuracy and bias and the like; the current readback precision data sheet mainly comprises 16 information fields such as channel name, maximum rated value of output power, current readback resolution, current readback precision and bias and the like; the data sheet of the constant voltage source effect mainly comprises 16 information fields of channel name, maximum rated value of output power, maximum rated value of output voltage, source voltage regulation rate and bias and the like; the constant current source effect data table mainly comprises 16 information fields such as channel name, maximum rated value of output power, maximum rated value of output current, source current regulation rate and bias, and the like; the data sheet of the constant voltage load effect mainly comprises 14 information fields of channel name, maximum rated value of output power, maximum rated value of output voltage, load voltage regulation rate and bias and the like; the data sheet of the constant current load effect mainly comprises 14 information fields of channel name, maximum rated value of output power, maximum rated value of output current, load current regulation rate and bias and the like; the ripple noise data table mainly comprises 10 information fields such as channel name, maximum rated value of output power, maximum rated value of output voltage, ripple noise error and the like.

The automatic calibration system of the invention adopts a double-field coding mode aiming at the channel range information of the power supply, namely a power supply model field and a channel range field, and the specific format is as follows: XXXXXX-n 1-n2-n3-n4; wherein, the 'XXXX' represents a power supply model field, which is composed of numbers, english letters or special characters, and generally refers to the numbering rule of equipment manufacturers directly. It should be noted that if the model name provided by the vendor contains "-", we need to replace it with "#". "-" represents a field connector, "n1-n2-n3-n4" represents a power channel range information field, and consists of four natural numbers with the numerical value of 1 to 9; "n1" represents the total number of channels for that power model; "n2" represents the channel serial number of the power supply model; "n3" represents the total number of ranges of a certain channel of the power supply model; "n4" represents the range number of a certain channel of the power supply model.

The examples show that: E3633A-1-1-2-1, power model E3633A, the power has 1 channel in total, and the channel has 2 ranges, currently referred to as the 1 st range of the channel.

IT6952A-1-1-1-1, which represents the power supply model is IT6952A, the power supply has 1 channel, and the channel has only 1 range, which is the channel range at present.

The coding mode has the advantages of being clear and intuitive; the channel and range number of the product can be rapidly known from the code name; the coding mode is simple, omission is prevented, and accurate identification and assignment of each channel range are facilitated through programming.

The main program of the automatic calibration system is developed based on a LabVIEW platform, and is composed of 44 VI programs, including 6 main modules, 9 sub modules and 29 support modules, and the flow is mainly shown in a block diagram 3. The main module comprises a system login module, an information input module, a calibration information selection module, a system initialization module, a system implementation progress module and a system single-channel range calibration implementation module which are sequentially connected; the sub-modules comprise a voltage setting value calibration module, a current setting value calibration module, a voltage measurement value calibration module, a current measurement value calibration module, a constant voltage load effect calibration module, a constant current load effect calibration module, a constant voltage source effect calibration module, a constant current load effect calibration module and a ripple noise calibration module which are all connected with the system single-channel range calibration implementation module; the support module includes: the system comprises a calibration record query and generation module, a calibration information display, selection and rejection module, a calibration system self-checking module, a calibration system addressing module, a calibration certificate and record initialization module, a calibration certificate and record output module, an uncertainty calculation module, a system communication configuration module and a data reduction module.

The system login module is mainly used for realizing login of an automatic calibration system, and aiming at flexible application of a LabVIEW character string comparison function, a global variable, an event structure and a While loop statement, a general flow diagram is shown in FIG. 4.

The information input module is matched with the calibration record inquiry and generation module to realize the input of calibration information and the inquiry and display of calibration information. The calibration information comprises 12 items of contents including the model of the equipment to be calibrated, the name of the equipment to be calibrated, a manufacturer, calibration time, the serial number of the equipment to be calibrated, an equipment asset number, an entrusting party, an address of the entrusting party, a certificate record number, ambient temperature, relative humidity and remarks, wherein the name of the equipment to be calibrated, the manufacturer and the calibration time are automatically filled in by a program, and other contents are manually input. The inquired information includes the 'checked device model number', 'certificate record number' and 'checked device serial number', after the inquiry information is input, the program can automatically search the relevant information in the database, and the inquiry result is fed back in real time in the interface prompt column, and the general flow is as shown in fig. 5.

The information input module is realized through a database access technology and a state machine control technology. The database access technology comprises the following steps: (1) Converting the udl file into a character string by using the polymorphic characteristics of part of VI functions, thereby realizing the interconnection of the labVIEW and the database; (2) Based on an ADO programming model, adopting SQL sentences to realize the addition, deletion, modification and check of the database by LabVIEW; provided is a control technology. A typical block diagram for a database read is shown in fig. 6.

The state machine control technology comprises the following steps: the LabVIEW state machine is composed of a While loop, a conditional structure and a shift register. Wherein the While loop is used to ensure that the program can run continuously; the various branches of the condition structure are used to describe the various states of the state machine; the shift register is used for switching between different states. An exemplary process for state machine control is shown in fig. 7.

The calibration information selection module selects and determines a power supply range channel needing to be calibrated according to power supply range channel information received from the information entry interface VI, and flexibly applies a LabVIEW array function, an event structure and a While loop statement; the general flow is shown in fig. 8.

The system initialization module mainly performs addressing access on communication equipment in automatic calibration, starts equipment self-checking, determines whether to continue to perform calibration according to the equipment self-checking state, and is realized by an instrument and equipment program control technology, and the general flow is shown in fig. 9. The instrument and equipment program control technology mainly comprises a virtual instrument software structure (VISA) and a programmable instrument Standard Command (SCPI). In the automatic calibration system, the official VISA toolkit provided by NI company is used to realize access control of various communication devices, a typical flow chart of the access of the communication devices is shown in fig. 10, a typical flow chart of the automatic identification of communication addresses is shown in fig. 11, and a typical flow chart of the automatic configuration of communication serial ports is shown in fig. 12.

The system implementation progress module mainly realizes the calibration certificate and record initialization, displays the processing progress in real time through a progress bar, and the overall flow is shown in fig. 13; the system implementation progress module starts an Excel automation server through labVIEW based on an ActiveX technology, sequentially creates methods such as Workboaks, sheets attributes, add, item and the like, assigns values to sheet objects and area units according to a programming target, and finally returns and closes the automation reference. A typical flow diagram for the ActiveX call procedure is shown in figure 14.

The automatic calibration system of the invention adopts excel to manufacture the calibration certificate and the recording template, the layout of the calibration certificate and the recording template is shown as figure 15, and the layout is different from the conventional layout mode according to the calibration items, but is arranged according to each measuring range channel of the DC power supply to be tested. During actual calibration, calibration is also performed in sequence according to each measuring range channel of the direct current power supply to be measured. The template layout is simple and clear, omission is not prone to occurring, applicability is high, any direct-current power supply can use the same certificate template, and computer programming is facilitated.

In the automatic calibration system, according to the measured direct current power supply channel range information coding technology, channel range information of the calibrated equipment is called out from a database, and then the channel range of the equipment needing to be calibrated is determined.

Assuming that the number of channel ranges to be calibrated by the equipment is N, starting an Excel automatic server through labVIEW based on an ActiveX technology, opening a calibration certificate recording template, and copying N times aiming at a specified sheet page (the certificate template is a sheet 3 page, and the recording template is a sheet 2 page); the certificate records the page number of each page, and is determined by i (i = 0-N-1) cyclic assignments by using a program cyclic structure, which is specifically shown in the following table:

TABLE 1 calibration certificate page number assignment formula

TABLE 2 calibration record Page number assignment formula

The system single-channel range calibration implementation module mainly aims at a single-channel range, and respectively starts a voltage setting value calibration module, a current setting value calibration module, a voltage measurement value calibration module, a current measurement value calibration module, a constant voltage load effect calibration module, a constant current load effect calibration module, a constant voltage source effect calibration module, a constant current load effect calibration module and a ripple noise calibration module to finish corresponding calibration according to a calibration rule; and carrying out data reduction on the returned data, and writing the data into a corresponding data area of the generated certificate record.

The sub-modules comprise a voltage setting value calibration module, a current setting value calibration module, a voltage measurement value calibration module, a current measurement value calibration module, a constant voltage load effect calibration module, a constant current load effect calibration module, a constant voltage source effect calibration module, a constant current load effect calibration module and a ripple noise calibration module which are all connected with the system single-channel range calibration implementation module. The sub-module is a direct current stable power supply calibration sub-module, mainly aims at a single measuring range channel, adjusts test parameters from a database according to a calibration procedure, respectively utilizes a communication program control technology to calibrate 9 items of tested equipment, completes data sampling for 6 times at each measuring point, eliminates abnormal measuring data according to a Grabbs criterion, averages effective measuring data and calculates uncertainty, and returns to a superior VI, and the overall flow is shown in figure 16.

In the automatic calibration system of the present invention, the conventional 9 calibration items are divided into two types according to the calibration requirements of the stable power supply: the current type and the voltage type are adopted, and the wiring mode of each type of calibration is specified, so that the actual wiring step of a calibration engineer is greatly simplified, and the error probability of the calibration item switching process is remarkably reduced.

The connection mode of the current calibration items is shown in fig. 17, and the calibration items include current setting accuracy, current read-back accuracy, source current effect, and load current effect; the voltage-based calibration item connection mode is shown in fig. 18, and the calibration items include voltage setting accuracy, voltage read-back accuracy, source voltage effect, load voltage effect, and ripple noise.

The system adopts LabVIEW as an application software development tool, and mainly applies four key technologies: the 'database access technology', 'state machine control technology', 'equipment communication measurement and control technology' and 'ActiveX report generation technology' realize the automatic calibration work of the measured stable power supply, such as communication docking, data processing, certificate manufacturing and the like with various equipment.

Three typical devices (namely 1 single-channel single-range device, 1 single-channel double-range device and 1 three-channel single-range device) are specially selected, manual and automatic calibration systems are respectively adopted for calibration, and certificates are issued. The test situation is shown in fig. 19, and it can be seen that compared with manual calibration, the overall time consumption for implementing automatic calibration is reduced by 73% on average, and the overall working efficiency per day is improved by 2.3 times on average.

According to the self characteristics of the automatic system, the certificate and the record template of any equipment have uniqueness, and the maintenance and the change are simple. Unlike manual calibration, different templates must be programmed for each type of equipment, are very error prone, and are not conducive to long term maintenance.

The invention utilizes automatic calibration equipment, and can theoretically cover most of various direct current power supply models on the market at present within the capability range. The current system can cover 90% of power models of I, and the coverage rate of the number of power supplies reaches 96%. The metering cost is expected to be saved by at least 30 ten thousand yuan per year.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims (10)

1. A direct current stabilized power supply automatic calibration system based on a LabVIEW development platform is characterized by comprising a hardware part and a software part;

the hardware part includes:

the voltmeter is used as a measurement standard for calibrating the voltage setting precision, the voltage readback precision, the load voltage regulation rate, the source voltage regulation rate and the voltage ripple of the direct-current power supply to be measured;

the I/V converter is matched with the voltmeter to serve as a measurement standard, and the current setting precision, the current read-back precision, the load current regulation rate and the source current regulation rate of the direct current power supply to be measured are calibrated;

the electronic load is used as the output load of the tested direct current power supply;

the alternating current voltage regulator is used as a power supply voltage and provides stable input voltage for the direct current power supply to be tested;

the software portion includes a database, an automated calibration system, and a certificate record template file.

2. The LabVIEW development platform-based DC stabilized power supply automated calibration system of claim 1, wherein the database comprises 12 data relational tables: an equipment model data sheet, a channel range data sheet, an equipment calibration information base data sheet, a voltage setting precision data sheet, a voltage readback precision data sheet, a current setting precision data sheet, a current readback precision data sheet, a constant voltage source effect data sheet, a constant current source effect data sheet, a constant voltage load effect data sheet, a constant current load effect data sheet and a ripple noise data sheet; the channel range field of the 12 data relation tables adopts a double-field coding mode, namely a power supply model field and a channel range field.

3. The automated direct current stabilized power supply calibration system based on LabVIEW development platform as claimed in claim 1, wherein the automated calibration system is developed based on LabVIEW platform, is composed of VI programs, and comprises a main module, a sub-module and a support module;

the main module comprises a system login module, an information input module, a calibration information selection module, a system initialization module, a system implementation progress module and a system single-channel range calibration implementation module which are sequentially connected;

the sub-modules comprise a voltage setting value calibration module, a current setting value calibration module, a voltage measurement value calibration module, a current measurement value calibration module, a constant voltage load effect calibration module, a constant current load effect calibration module, a constant voltage source effect calibration module, a constant current load effect calibration module and a ripple noise calibration module which are all connected with the system single-channel range calibration implementation module;

the support module includes:

the calibration record inquiring and generating module is connected with the information input module;

the calibration information display, selection and elimination module is connected with the calibration information selection module;

the calibration system self-checking module and the calibration system addressing module are connected with the system initialization module;

the calibration certificate, the record initialization module, the calibration certificate and the record output module are all connected with the system implementation progress module;

and the uncertainty calculation module, the system communication configuration module and the data reduction module are all connected with the system single-channel range calibration implementation module.

4. The LabVIEW development platform-based automatic calibration system for the direct-current stabilized power supply as claimed in claim 3, wherein the system login module realizes login of the automatic calibration system, and the login process comprises:

setting a login account and a password character string;

initializing a global variable;

entering an information input interface if the login information is correct; otherwise, the user cannot enter the system.

5. The LabVIEW development platform-based automatic calibration system for the direct-current stabilized power supply as claimed in claim 3, wherein the information entry module is matched with the calibration record query and generation module to realize the entry, query and display of calibration information;

the calibration information comprises 12 items of contents including the model of the equipment to be calibrated, the name of the equipment to be calibrated, a manufacturer, calibration time, the serial number of the equipment to be calibrated, the asset number of the equipment, an entrusting party, the address of the entrusting party, the serial number of a certificate record, the ambient temperature, the relative humidity and remarks; the name of the equipment to be calibrated, the manufacturer and the calibration time are automatically filled in by a program, and other contents need to be manually input.

6. The LabVIEW development platform-based DC stabilized power supply automatic calibration system as claimed in claim 3, wherein the calibration information selection module cooperates with the calibration information display, selection and removal module to select and determine the power supply range channel to be calibrated with respect to the power supply channel range information received from the information entry module.

7. The LabVIEW development platform-based DC stabilized power supply automatic calibration system as claimed in claim 3, wherein the system initialization module cooperates with the calibration system self-test module and the calibration system addressing module to perform addressing access for the communication device, to start device self-test, and to determine whether to continue to perform calibration according to the device self-test status.

8. The automated calibration system for the direct current stabilized power supply based on the LabVIEW development platform as claimed in claim 3, wherein the system implements a progress module to cooperate with the calibration certificate, the record initialization module, the calibration certificate and the record output module to realize the calibration certificate and the record initialization, and displays the processing progress in real time through a progress bar;

manufacturing a calibration certificate and a recording template by using excel, and carrying out layout according to the measuring range of each channel of the direct-current power supply to be tested; during actual calibration, sequentially and respectively implementing calibration according to the range of each channel of the tested direct-current power supply;

the calibration certificate is made by the following method: according to the channel range information coding technology of the tested direct current power supply, the channel range information of the device to be calibrated is called out from a database, and then the channel range of the device to be calibrated is determined.

9. The automated calibration system for the direct current stabilized power supply based on the LabVIEW development platform as claimed in claim 3, wherein the single-channel range calibration implementation module of the system respectively starts 9 sub-modules to complete corresponding calibration according to the calibration procedure for the single-channel range; and carrying out data reduction on the returned data, and writing the data into a corresponding data area of the generated certificate record.

10. The automated calibration system for dc stabilized power supply based on LabVIEW development platform of claim 9, wherein the 9 sub-modules adjust the test parameters from the database for a single range channel according to the calibration procedure, respectively perform a total of 9 project calibrations on the device under test using the communication program control technology, each measurement point completes the data sampling 6 times, eliminates abnormal measurement data according to the grassburg criterion, averages the valid measurement data and calculates the uncertainty, and returns to the system single-range calibration implementation module;

according to the calibration requirement of the DC power supply to be tested, the 9 items are divided into two types: a voltage type and a current type, and specifying a wiring pattern for each type calibration; wherein, the first and the second end of the pipe are connected with each other,

the voltage class calibration items include: voltage setting precision, voltage readback precision, source voltage effect, load voltage effect and ripple noise;

the current-based calibration items include: current setting accuracy, current readback accuracy, source current effect, load current effect.

Images