CN210465546U

CN210465546U - Intelligent loop resistance tester

Info

Publication number: CN210465546U
Application number: CN201921097685.0U
Authority: CN
Inventors: 伍于池
Original assignee: Guangzhou Chihong Mechanical And Electrical Equipment Co ltd
Current assignee: Guangzhou Chihong Mechanical And Electrical Equipment Co ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2020-05-05
Anticipated expiration: 2029-07-11

Abstract

The utility model provides an intelligent loop resistance tester, which comprises a shell, wherein a cavity is arranged inside the shell, a door body is arranged on the shell, the door body is movably connected with the shell, and the door body is movably covered on the cavity; be provided with a control panel on the door body, control panel includes the printer, the LCD screen, first control panel, second control panel and third control panel, first control panel includes the ground connection post, the voltage incoming end, the voltage connection end, current incoming end and current connect the end, the second control panel includes the pilot lamp, knob and reset button, the third control panel includes the switch, socket and USB connect, can be fast accurate measure and calculate the resistance that awaits measuring through adopting the four-wire method, handle the back through central processing unit to data, can be immediately from the printer print test result, and can connect the back through the USB line and will measure on the data transmission computer, directly handle data through central processing unit, calculate, can reduce the error that produces because of manual calculation well.

Description

Intelligent loop resistance tester

Technical Field

The utility model relates to an electric power system check out test set technical field especially relates to an intelligence return circuit resistance tester.

Background

At present, three methods for testing loop resistance are mainly used, namely a bridge method, a voltage drop method and a four-wire method. When the bridge method is used for measuring the resistance of the conductive loop of the circuit breaker by using a double-arm bridge, the measured resistance value is larger because the measuring loop passes weak current, and a larger oxidation film is difficult to eliminate. The voltage drop method is a method in which, when a direct current is applied to a circuit to be measured, a voltage drop is generated in a contact resistance of the circuit, and a current value and a voltage value passing through the circuit are measured to calculate the contact resistance. The test process is complicated, and certain errors exist in the measurement result calculated manually.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model adopts the following technical scheme: an intelligent loop resistance tester, comprising: the refrigerator door comprises a shell, a door body and a door body, wherein a cavity is formed in the shell, the door body is arranged on the shell, one side of the door body is movably connected with the shell, and the door body movably covers the cavity;

the door body is provided with a control panel, the control panel comprises a printer, a liquid crystal screen, a first control panel, a second control panel and a third control panel, the first control panel comprises a grounding column, a voltage access end, a voltage connection outlet end, a current access end and a current connection outlet end, the second control panel comprises an indicator lamp, a knob and a reset button, and the third control panel comprises a switch, a socket and a USB connector;

still be provided with a plurality of buttons on the door body, the ground connection post voltage incoming end the voltage connection end the current incoming end with the current connects the end and is used for with external connection, the printer the LCD screen the pilot lamp the knob reset button the switch the socket with the USB connects all to be connected with a central processing unit electricity.

Further, the liquid crystal screen is an LCD display screen.

Further, control panel still includes two signal amplification modules and AD conversion module, two the signal amplification module all is used for receiving voltage signal, and two the signal amplification module all is connected with AD conversion module electricity.

Further, the AD conversion module is in electric signal connection with the central processing unit.

Furthermore, the two signal amplification modules are filtering amplification modules.

Further, the knob is a knob mouse.

Furthermore, the working temperature of the intelligent loop resistance tester is-10 ℃ to 40 ℃, and the relative humidity is less than or equal to 80 percent RH.

Furthermore, the control panel is also provided with an over-temperature protection system, and the over-temperature protection system is used for protecting the control panel.

Furthermore, a wire groove is formed in one surface, far away from the control panel, of the door body, a plurality of through holes are formed in the side wall of the wire groove, and the through holes are formed at equal intervals.

Furthermore, a sealing ring is arranged on one surface of the door body, which is provided with the wire slot, and the sealing ring is movably abutted against the shell.

The utility model has the advantages that: through adopting this intelligence return circuit resistance tester, can be fast accurate through adopting the four-wire method to measuring and calculating the resistance that awaits measuring, and handle the back through central processing unit to data, can be immediately from the printer printing test result to can connect the data transmission that will measure after the USB connects to the computer through the USB line, directly handle data through central processing unit, calculate, can reduce the error that produces because of manual calculation well.

Drawings

The figures further illustrate the invention, but the embodiments in the figures do not constitute any limitation of the invention.

FIG. 1 is a schematic diagram of an embodiment of an intelligent loop resistance tester;

FIG. 2 is a schematic view of a door body according to an embodiment;

fig. 3 is a flowchart illustrating an operation of an intelligent loop resistance tester according to an embodiment.

Detailed Description

The following will combine the drawings of the embodiments of the present invention to further describe the technical solution of the present invention, and the present invention is not limited to the following specific embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

As shown in fig. 1 and 2, an intelligent loop resistance tester includes: the refrigerator comprises a shell 100, wherein a cavity is formed in the shell 100, a door body 200 is arranged on the shell 100, one side of the door body 200 is movably connected with the shell 100, and the cavity is movably covered by the door body 200. Specifically, one side of the door body 200 is hinged to the case 100.

Be provided with a control panel 300 on door body 200, control panel 300 includes printer 400, LCD screen 500, first control panel 600, second control panel 700 and third control panel 800, first control panel 600 includes ground connection post 610, voltage incoming end 620, voltage connects out end 630, current incoming end 640 and current and connects out end 650, second control panel 700 includes pilot lamp 710, knob 720 and reset button 730, third control panel 800 includes switch 810, socket 820 and USB connects 830.

The door body 200 is further provided with a plurality of buttons 900, the ground post 610, the voltage input end 620, the voltage output end 630, the current input end 640 and the current output end 650 are used for being connected with the outside, and the printer 400, the liquid crystal display 500, the indicator lamp 710, the knob 720, the reset button 730, the switch 810, the socket 820 and the USB connector 830 are all electrically connected with a central processing unit (not shown), specifically, the central processing unit is a single chip microcomputer. Further, the control panel 300 further includes two signal amplification modules (not shown) and an AD conversion module (not shown), wherein the two signal amplification modules are both used for receiving a voltage signal, and are both electrically connected to the AD conversion module, and it is worth mentioning that the two signal amplification modules are filtering amplification modules.

As shown in fig. 3, a current source is externally connected to the current incoming end 640 and the current outgoing end 650, and two ends of the resistor Rx to be measured are respectively connected to the voltage incoming end 620 and the voltage outgoing end 630, the current source outputs a constant current to flow through a standard resistor Ro and the resistor Rx to be measured which are built in the control panel 300, a voltage signal Uo on the standard resistor Ro is sampled, the voltage signal Uo is processed by the filtering and amplifying module and then sent to the AD conversion module as a digital value, and then the digital value is obtained by the formula: the current value I is equal to the voltage signal Uo/the standard resistor Ro, after the calculation is finished, the current value I can be obtained, then the voltage signal Ux on the resistor Rx to be measured is sampled, and the voltage signal Ux is processed by the filtering amplification module and then is sent to the AD conversion module to be digital quantity, and then the digital quantity is obtained through a formula: the resistance Rx to be measured is equal to the voltage signal Ux/the current value I, and the resistance Rx to be measured can be calculated.

Further, the control panel 300 further includes a storage module and a clock module, the storage module is used for storing the test data, the storage module and the clock module are electrically connected to the central processing unit, and the clock module can be used for displaying time on the liquid crystal display 500 and recording time corresponding to each group of test data.

In one embodiment, the LCD screen 500 is an LCD display screen, specifically, the LCD display screen is a 240 × 128 high-resolution gray backlight LCD screen, and by setting the LCD screen 500 and sending the test data to the LCD screen 500 through the central processing unit, the parameter setting and the test result are both displayed on the LCD screen, and the whole LCD screen 500 full-chinese-character operation interface has clear and beautiful patterns and is easy to operate.

In one embodiment, the knob 720 is a knob mouse, and specifically, the knob mouse can be rotated left and right and confirmed, that is, when the knob mouse is rotated left or right to move a cursor displayed on the lcd 500, and then when the cursor is moved to an option to be selected, the knob mouse is directly pressed to select the option.

In one embodiment, the working temperature of the intelligent loop resistance tester is-10 ℃ to 40 ℃, and the relative humidity is less than or equal to 80% RH. Specifically, the control panel 300 further has an over-temperature protection system for protecting the control panel 300. Furthermore, the over-temperature protection system is an over-temperature protection circuit, and the over-temperature protection circuit can automatically stop outputting current when the whole intelligent loop resistance tester exceeds the set temperature, so that the safe use of the intelligent loop resistance tester is ensured.

In one embodiment, a slot 110 is disposed on a surface of the door body 200 away from the control panel 300, and a plurality of through holes are disposed on a side wall of the slot 110, and the through holes are disposed at equal intervals. Specifically, the cross-sectional shape of the wire casing 110 is "U" shape, that is, the wire casing 110 may be specifically arranged according to specific requirements, for example, the cross-sectional shape of the wire casing 110 is square, and for example, the cross-sectional shape of the wire casing 110 is rectangular. Through setting up wire casing 110, and set up a plurality of through-holes on the side of wire casing 110 for the electric wire that a plurality of buttons 900 that set up on the door body 200 are connected can pass the through-hole and then place in wire casing 110, and then integrate all electric wires, makes wholly more pleasing to the eye, when the circuit damages, can find the source of damaging the circuit more fast, is convenient for maintain the circuit.

In one embodiment, a sealing ring (not shown) is disposed on a surface of the door 200, where the linear groove 110 is disposed, and the sealing ring is movably abutted against the housing 100. That is, by providing the sealing ring, when the door 200 covers the casing 100, the sealing effect of the entire cavity is better.

As described above, the above embodiments are not limiting embodiments of the present invention, and modifications or equivalent variations made by those skilled in the art based on the substance of the present invention are within the technical scope of the present invention.

Claims

1. The intelligent loop resistance tester is characterized by comprising a shell, wherein a cavity is formed in the shell, a door body is arranged on the shell, one side of the door body is movably connected with the shell, and the door body movably covers the cavity;

2. The intelligent loop resistance tester of claim 1, wherein: the liquid crystal screen is an LCD display screen.

3. The intelligent loop resistance tester of claim 1, wherein: the control panel still includes two signal amplification modules and AD conversion module, two the signal amplification module all is used for receiving voltage signal, and two the signal amplification module all is connected with AD conversion module electricity.

4. The intelligent loop resistance tester of claim 3, wherein: the AD conversion module is electrically connected with the central processing unit.

5. The intelligent loop resistance tester of claim 3, wherein: the two signal amplification modules are filtering amplification modules.

6. The intelligent loop resistance tester of claim 1, wherein: the knob is a knob mouse.

7. The intelligent loop resistance tester of claim 1, wherein: the working temperature of the intelligent loop resistance tester is-10 ℃ to 40 ℃, and the relative humidity is less than or equal to 80 percent RH.

8. The intelligent loop resistance tester of claim 7, wherein: the control panel is also provided with an over-temperature protection system, and the over-temperature protection system is used for protecting the control panel.

9. The intelligent loop resistance tester of claim 1, wherein: a wire groove is formed in one face, far away from the control panel, of the door body, a plurality of through holes are formed in the side wall of the wire groove, and the through holes are formed at equal intervals.

10. The intelligent loop resistance tester of claim 9, wherein: the door body sets up be provided with the sealing washer on the one side of wire casing, the sealing washer with the casing activity butt.