CN203117253U

CN203117253U - Portable multipurpose tester based on ARM

Info

Publication number: CN203117253U
Application number: CN 201220592761
Authority: CN
Inventors: 唐颖; 黄凤江; 任际周; 李晶; 李大军; 赵晓凤; 陈熙
Original assignee: Chengdu Univeristy of Technology
Current assignee: Chengdu Univeristy of Technology
Priority date: 2012-11-12
Filing date: 2012-11-12
Publication date: 2013-08-07
Anticipated expiration: 2022-11-12

Abstract

A portable multipurpose tester based on an ARM relates to the voltage, current and resistance test technology field. The tester comprises a chassis and a panel. A PC industrial personal computer, an ARM controller, a signal conditioning circuit and a true RMS conversion circuit are arranged in the chassis. The ARM controller comprises a CPU control unit, a RS 232 interface unit, a measurement data analysis and processing unit. The signal conditioning circuit 3 comprises a channel switching management circuit, a program control amplification circuit and a constant current source circuit. The true RMS conversion circuit comprises a true RMS conversion unit and an AD conversion unit. The channel switching management circuit and the constant current source circuit of the signal conditioning circuit are connected with the CPU control unit on the ARM controller through an IO data line. The program control amplification circuit is connected with the CPU control unit on the ARM controller through a 3 line SPI bus. The CPU control unit on the ARM controller is connected with the PC industrial personal computer through the RS 232 interface unit. A measurement task is set under an upper computer Window interface. The tester of the utility model possesses the characteristics that an operation is visual and simple; carrying is convenient.

Description

A kind of portable multi-purpose tester based on ARM

Technical field

The utility model relates to voltage, electric current, resistance test technical field, especially a kind of portable multi-purpose tester based on ARM.

Background technology

The measuring technique of voltage, electric current, resistance is modal to be exactly multimeter, and namely multimeter because of its low price, is easy to carry, and extensively is used in occasions such as scientific research, production, maintenance, detection.The design concept of multimeter is to convert voltage, electric current, resistance signal to suitable voltage signal, send into modulus conversion chip, and do liquid crystal display, conversion and the gear of test parameter switch by rotary switch, high-grade any multimeter, possessed the range auto-conversion function, only needed the switch test object.Multimeter is the surveying instrument of an independent operating, and data result can only manually read, and in Auto-Test System, can't be connected with other testing apparatus, finishes automatic calibration, test automatically, and will give on the test data, lack robotization.The controller of single-chip microcomputer as the multi-usage tester appearred in development afterwards, but because the single-chip microcomputer internal resource is limited, so must additionally increase peripheral hardware, as ad/da converter, and arithmetic capability and control ability all slightly a little less than, and the ARM technology that this recent development in several years is got up, CPU fast operation then, the FLASH storage space is big, integrated functional modules such as AD/DA, the I/O port resource is abundant, and control is flexibly, therefore adopt the voltage based on the ARM control chip, electric current, the multi-usage tester design of resistance then can reach more perfect function, performance is more superior, circuit structure is more succinct, satisfies set design objective requirement fully.

Summary of the invention

The purpose of this utility model is exactly to overcome the inconvenience that can't realize robotization, design a kind of ARM controller that utilizes, utilize the real effective conversion chip, test assignment requirement according to host computer, automatically operation, the control survey circuit, range is changed automatically, measurand is measured, and returned test result to the host computer demonstration.

The technology solution of the purpose of realization the utility model is as follows:

A kind of portable multi-purpose tester based on ARM comprises casing, panel, and PC industrial computer 1, ARM controller 2, signal conditioning circuit 3, real effective change-over circuit 4 are installed in casing; ARM controller 2 comprises CPU control module 2.1, RS232 interface unit 2.2, measurement data analysis and processing unit 2.3, and signal conditioning circuit 3 comprises passage handover management circuit 3.1, programmable amplifying circuit 3.2, constant-current source circuit 3.3; Real effective change-over circuit 4 comprises real effective converting unit 4.1 and AD converting unit 4.2; The passage handover management circuit 3.1 of signal conditioning circuit 3 and constant-current source circuit 3.3 are connected with CPU control module 2.1 on the ARM controller 2 by the IO data line, and programmable amplifying circuit 3.2 is connected with CPU control module 2.1 on the ARM controller 2 by 3 line spi bus.

CPU control module 2.1 on the ARM controller 2 of described portable multi-purpose tester based on ARM is connected with PC industrial computer 1 by RS232 interface unit 2.2.

The AD converting unit 4.2 of the real effective change-over circuit 4 of described portable multi-purpose tester based on ARM is connected by 3 line spi bus with the CPU control module 2.1 on the ARM controller 2.

The main control chip of the ARM controller 2 of described portable multi-purpose tester based on ARM adopts LPC2136 ARM chip.

The signal conditioning circuit 3 of described portable multi-purpose tester based on ARM adopts the MAX532 chips.

The AD converting unit 4.2 of the real effective change-over circuit 4 of described portable multi-purpose tester based on ARM adopts the MAX1167 chips.

The system works principle of this multi-usage tester mainly is that the CPU control module is received in the measurement task that upper industrial computer arranges by the RS232 interface, resolve to and measure the output execution command, the control range automaticallyes switch, nurse one's health into suitable input voltage signal, measure and transmit result shows to host computer.

Compared with prior art, the advantage of this tester and good effect are to have adopted ARM chip and real effective conversion chip, utilize ARM that stronger arithmetic capability is arranged, can handle fast and transmit data, satisfied writing to each other between host computer and tester; The real effective conversion chip guarantees that the external input signal non-sinusoidal also can test accurately equally, is measuring under the Windows interface on the host computer, and operation is directly perceived, simple, easy to carry, satisfies open-air actual action need.

Description of drawings

Fig. 1 is this novel described schematic block circuit diagram synoptic diagram;

Fig. 2 is this novel described ARM controller and signal condition, real effective transformational structure block diagram representation;

Fig. 3 is this novel described ARM controller circuitry figure;

Fig. 4 is this novel described signal conditioning circuit figure;

Fig. 5 is this novel described real effective change-over circuit figure;

Fig. 6 is the embodiment panel synoptic diagram of this novel described multi-usage tester;

Embodiment

The embodiment and the synoptic diagram that provide referring to Fig. 1 to Fig. 6.A kind of portable multi-purpose tester based on ARM comprises casing, panel, and PC industrial computer 1, ARM controller 2, signal conditioning circuit 3, real effective change-over circuit 4 are installed in casing; ARM controller 2 comprises CPU control module 2.1, RS232 interface unit 2.2, measurement data analysis and processing unit 2.3, and signal conditioning circuit 3 comprises passage handover management circuit 3.1, programmable amplifying circuit 3.2, constant-current source circuit 3.3; Real effective change-over circuit 4 comprises real effective converting unit 4.1 and AD converting unit 4.2; The passage handover management circuit 3.1 of signal conditioning circuit 3 and constant-current source circuit 3.3 are connected with CPU control module 2.1 on the ARM controller 2 by the IO data line, and programmable amplifying circuit 3.2 is connected with CPU control module 2.1 on the ARM controller 2 by 3 line spi bus.

CPU control module 2.1 on the present embodiment ARM controller 2 is connected with PC industrial computer 1 by RS232 interface unit 2.2.The AD converting unit 4.2 of real effective change-over circuit 4 is connected by 3 line spi bus with CPU control module 2.1 on the ARM controller 2.The ARM controller is responsible for receiving the test assignment of host computer and is resolved to the circuit execution command and regulates control accordingly, and The ultimate results delivered on the host computer show, be the core of whole s operation control, the main control chip of ARM controller 2 adopts LPC2136 ARM chip.

Signal conditioning circuit 3 adopts the MAX532 chip, and the AD converting unit 4.2 of real effective change-over circuit 4 adopts the MAX1167 chip.To be host computer issue main control chip LPC2136 ARM on the ARM controller to the measurement mission bit stream that has arranged by the RS232 interface to industrial computer 1, main control chip LPC2136 ARM is construed to the circuit measuring execution command, pass to passage handover management circuit 3.1, programmable amplifying circuit 3.2 and AD converting unit 4.2, and with the measurement data of AD converting unit, by serial communication protocol RS232, occur on the host computer and show, programmable amplifying circuit 3.2 and AD converting unit 4.2 are formed the range automatic switching circuit, judge the size of AD value, control the multiplying power of program control amplification, utilize binary chop, shorten and judge bout, choose appropriate gear as early as possible.

This novel workflow is: behind the system boot, and at first initialization, process scheduling, host computer communication process, measurement task data input process, abnormality processing process.After host computer is finished the setting of measurement mission bit stream, host computer can send to the information content on the ARM controller by the RS232 interface automatically, after the ARM controller is received, switch to measured passage, the same passage of voltage and resistance, the independent passage of electric current, by detecting translation data, constantly adjust enlargement factor, only arrive signal amplitude in measurement range, gear information and measurement data are dealt on the host computer in the lump, calculate demonstration by host computer.

This is novel in order to guarantee measuring accuracy, signal condition partly adopts high precision, low temperature to float, hang down the bias current amplifier, AD adopts figure place to adopt 12bit, reference source adopts the dedicated serial voltage reference, eliminate channel error in addition, before measuring, passage is measured measurement result deduction channel error value by software.

The operating process of this tester is as follows:

1, individual event test pattern: select test event, DC voltage, alternating voltage, DC current, alternating current, resistance after test is finished, show measurement data automatically;

2, automatic test pattern: according to the arrangement in proper order of test assignment, the automatic switchover test event waits for testing and finishes that test result is sent into systematic unity and handled.

Described a kind of portable multi-purpose tester technical indicator based on ARM is as follows:

1, display precision: four and half ± 1 word

2, display speed: 3 times/second

3, DC voltage input range: ± 2V～± 400V

4, alternating voltage input range: 2V～250V(AC)

5, DC current input range: ± 2mA～± 2A

6, alternating current input range: 2mA～2A(AC)

7, resistance input range: 10～2M Europe

8, input impedance:〉1M Europe/15pF

9, measuring accuracy: 0.1%

This novel measure analog front end and digital processing are partly adopted fully and are isolated, and when guaranteeing external testing AC220V, can not influence entire equipment, so (Fig. 5, U24), signal adopts optocoupler to isolate fully to the DC/DC converter that power supply adopts 12V to become a full member bears 5V.

Claims

1. portable multi-purpose tester based on ARM, it is characterized in that: engine body exterior comprises casing, panel, and PC industrial computer (1), ARM controller (2), signal conditioning circuit (3), real effective change-over circuit (4) are installed in its body; ARM controller (2) comprises CPU control module (2.1), RS232 interface unit (2.2), measurement data analysis and processing unit (2.3), and signal conditioning circuit (3) comprises passage handover management circuit (3.1), programmable amplifying circuit (3.2), constant-current source circuit (3.3); Real effective change-over circuit (4) comprises real effective converting unit (4.1) and AD converting unit (4.2); The passage handover management circuit (3.1) of signal conditioning circuit (3) and constant-current source circuit (3.3) are connected with CPU control module (2.1) on the ARM controller (2) by the IO data line, and programmable amplifying circuit (3.2) is connected with CPU control module (2.1) on the ARM controller (2) by 3 line spi bus.

2. according to the described a kind of portable multi-purpose tester based on ARM of claim 1, it is characterized in that the CPU control module (2.1) on the ARM controller (2) is connected with PC industrial computer (1) by RS232 interface unit (2.2).

3. according to the described a kind of portable multi-purpose tester based on ARM of claim 1, it is characterized in that the main control chip of ARM controller (2) adopts LPC2136 ARM chip.

4. according to the described a kind of portable multi-purpose tester based on ARM of claim 1, it is characterized in that signal conditioning circuit (3) adopts the MAX532 chip.

5. according to the described a kind of portable multi-purpose tester based on ARM of claim 1, it is characterized in that the AD converting unit (4.2) of real effective change-over circuit (4) adopts the MAX1167 chip.