CN111103563A

CN111103563A - Automatic correction device of universal meter

Info

Publication number: CN111103563A
Application number: CN202010047462.4A
Authority: CN
Inventors: 周加铭
Original assignee: Shenzhen Chengke Technology Co Ltd
Current assignee: Shenzhen Chengke Technology Co Ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-05-05

Abstract

The invention discloses an automatic correction device of a universal meter, which comprises a mounting seat, a control mainboard arranged on the mounting seat, an output interface arranged on the side surface of the control mainboard, a nixie tube displayer arranged on the front surface of the control mainboard, a state indicator lamp, a single chip microcomputer and a power switch, wherein the output interface is used for being connected with the universal meter to be corrected, the nixie tube displayer is used for displaying correction steps and correction contents, the state indicator lamp is used for indicating the state and the correction results of the correction device, a stabilized voltage power supply arranged on one side of the control mainboard is arranged on the mounting seat, and a power resistor, an electrolytic capacitor and a manganese copper wire are arranged on the control mainboard. The whole process does not need manual intervention, reduces the labor cost, overcomes the defect of artificial misjudgment, and greatly reduces the capital expenditure for purchasing an expensive multimeter corrector by a production line.

Description

Automatic correction device of universal meter

Technical Field

The invention relates to the field of measurement of instruments and meters, in particular to an automatic correction device for a universal meter.

Background

Generally, in the conventional multimeter (DMM) production calibration, a relatively expensive multimeter calibration instrument is used, a production worker needs to manually switch different calibration sources such as voltage, resistance, capacitance and current to output to a multimeter to be calibrated, and even some products need to manually adjust a potentiometer to achieve measurement accuracy. Therefore, the production needs to consume a lot of manpower and financial resources, and the production efficiency depends on the proficiency of workers. Whether the measurement is accurate or not is judged by eyes of an operator, and the misjudgment condition is easy to occur.

Disclosure of Invention

The invention aims to overcome the technical defects and provide an automatic correction device for a multimeter.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: the utility model provides an automatic correcting unit of universal meter, includes the mount pad, sets up control mainboard on the mount pad, sets up the output interface and set up at positive charactron display, status indicator lamp, singlechip and switch in control mainboard side at control mainboard, the output interface is used for linking to each other with the universal meter that needs to do the correction, the charactron display is used for showing correction step and correction content, the status indicator lamp is used for indicating correcting unit's state and correction result, be equipped with the constant voltage power supply that is located control mainboard one side and sets up on the mount pad, constant voltage power supply supplies power for the singlechip and provides the universal meter and be the voltage reference source, be equipped with power resistor, electrolytic capacitor and manganese copper line on the control mainboard.

As an improvement, the number of the nixie tube displays is four, the number of the status indicator lamps is three, and the three status indicator lamps are respectively used for displaying the pass correction, the failure correction and the correction.

As an improvement, a resistor R12, a resistor R13, a resistor R21, a resistor R22, a resistor R27 and a resistor R28 are arranged on the control main board, and the multimeter resistor network is calibrated and corrected through the resistor R12, the resistor R13, the resistor R21, the resistor R22, the resistor R27 and the resistor R28.

As an improvement, the power resistor and the electrolytic capacitor are switched into the input end of the multimeter through a relay K3, a relay K4, a relay K18 and a relay K19.

As a modification, the manganin wire and standard voltage are connected with a multimeter circuit through a relay K2 and a relay K5.

Compared with the prior art, the invention has the advantages that: in the correction process of the automatic correction device for the universal meter, the universal meter mainboard is in two-way communication with equipment through the UART or the SPI, manual intervention is not needed in the whole process, the labor cost is reduced, the defect of manual misjudgment is overcome, standard sources needed to be used are all integrated into the equipment, and the capital expenditure for purchasing an expensive universal meter correction instrument by a production line is greatly reduced.

Drawings

FIG. 1 is a correction code table of a digital tube display of an automatic correction device of a multimeter according to the present invention;

FIG. 2 is a schematic front view of an automatic calibration device for a multimeter of the present invention;

FIG. 3 is a schematic diagram of the voltage and current correction circuit of an automatic correction device for a multimeter of the present invention;

FIG. 4 is a schematic diagram of the circuit principle of resistance and capacitance correction of an automatic correction device of a multimeter of the present invention;

FIG. 5 is a schematic diagram of a circuit for calibrating a resistance network of an automatic calibration device of a multimeter of the present invention.

As shown in the figure: 1. the device comprises a mounting base, 2, a control main board, 3, an output interface, 4, a nixie tube display, 5, a state indicator lamp, 6, a single chip microcomputer, 7, a power switch, 8, a stabilized voltage power supply, 9, a power resistor, 10, an electrolytic capacitor, 11 and a manganese copper wire.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

With reference to the accompanying drawings 1-5, an automatic correction device for a universal meter comprises a mounting base 1, a control mainboard 2 arranged on the mounting base 1, an output interface 3 arranged on the side surface of the control mainboard 2, a nixie tube displayer 4 arranged on the front surface of the control mainboard 2, a state indicator lamp 5, a single chip microcomputer 6 and a power switch 7, wherein the output interface 3 is used for being connected with the universal meter needing to be corrected, the nixie tube displayer 4 is used for displaying correction steps and correction contents, the state indicator lamp 5 is used for indicating the state and the correction results of the correction device, a voltage-stabilized power supply 8 arranged on one side of the control mainboard 2 is arranged on the mounting base 1, the voltage-stabilized power supply 8 supplies power to the single chip microcomputer 6 through the voltage stabilizer and supplies power to the universal meter to serve as a voltage reference source, and a power resistor.

The number of the nixie tube displays 4 is four, the number of the status indicator lamps 5 is three, and the three status indicator lamps 5 are respectively used for displaying that the correction is passed, the correction is failed and the correction is being performed.

The control mainboard 2 is provided with a resistor R12, a resistor R13, a resistor R21, a resistor R22, a resistor R27 and a resistor R28, and the multimeter resistor network is calibrated and corrected through the resistor R12, the resistor R13, the resistor R21, the resistor R22, the resistor R27 and the resistor R28.

The power resistor 9 and the electrolytic capacitor 10 are switched into the input end of the multimeter through a relay K3, a relay K4, a relay K18 and a relay K19.

The manganin wire 11 and the standard voltage are connected with a multimeter circuit through a relay K2 and a relay K5.

When the method is implemented specifically, firstly, the following ports need to be reserved when the universal meter draws a PCB (printed Circuit Board): COM, MV input pin, 10A, VDDA, VDD, power ground, network resistance and communication interface (UART or SPI), put the universal meter that needs to correct on the test jig, link the port of reserving the port and automatic correction equipment with the thimble, the dial of the universal meter turns to the resistance gear, then turn on the power of the correction equipment, if the apparatus is successful with the universal meter communication, will start the automatic correction step, display the corresponding correction code on the display of the four-digit charactron sequentially as shown in figure 1, after the correction of the present step succeeds, turn to the next step automatically, in the course of correcting, the status indicator lamp lights BUSY, until all content needing to correct is finished, the four-digit charactron displays END, the status indicator lamp lights OK, if one step of correction fails in the middle, the charactron stops displaying the corresponding correction code, the status indicator lamp lights NG.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a universal meter automatic correction device, includes mount pad (1), sets up control mainboard (2) on mount pad (1), sets up output interface (3) and the positive charactron display (4), status indicator lamp (5), singlechip (6) and switch (7) of setting in control mainboard (2) side at control mainboard (2), its characterized in that: output interface (3) are used for linking to each other with the universal meter that needs to do the correction, charactron display (4) are used for showing correction step and correction content, status indicator lamp (5) are used for instructing correcting unit's state and correction result, be equipped with constant voltage power supply (8) that are located control mainboard (2) one side and set up on mount pad (1), constant voltage power supply (8) are supplied power for singlechip (6) and are offered the universal meter and do the voltage reference source through the stabiliser, be equipped with power resistor (9) on control mainboard (2), electrolytic capacitor (10) and manganese copper line (11).

2. The multimeter calibration device of claim 1, wherein: the number of the nixie tube displays (4) is four, the number of the status indicator lamps (5) is three, and the three status indicator lamps (5) are respectively used for displaying that the correction is passed, the correction is failed and the correction is being performed.

3. The multimeter calibration device of claim 1, wherein: the control main board (2) is provided with a resistor R12, a resistor R13, a resistor R21, a resistor R22, a resistor R27 and a resistor R28, and the multimeter resistor network is calibrated and corrected through the resistor R12, the resistor R13, the resistor R21, the resistor R22, the resistor R27 and the resistor R28.

4. The multimeter calibration device of claim 1, wherein: the power resistor (9) and the electrolytic capacitor (10) are switched into the input end of the multimeter through a relay K3, a relay K4, a relay K18 and a relay K19.

5. The multimeter calibration device of claim 1, wherein: the manganin wire (11) and the standard voltage are connected with a multimeter circuit through a relay K2 and a relay K5.