外文文献及翻译基于单片机的电子称设计Word下载.docx

1、1（ How it works: electronic works in electronic components （weighing sensor, AD conversion circuit, microcontroller circuits, display circuit, keyboard circuitry, communications interface circuits, regulated power supply circuit circuit. 2（ using the function: electronic weighing the use of modern s

2、ensor technology, electronics and computer technology integration, electronic weighing devices, in order to meet and solve real lifes fast, accurate, continuous, automatic weighing requirements, while effectively eliminating human error, to make it more in line with the management of legal metrology

3、 and industrial production process control applications. 3. Three health scales are weighing the use of features in a category （divided into mechanical and electronic）, inexpensive, it can help people to effectively monitor their own body weight changes, new products also can detect their fat conten

4、t, but also Some human-oriented subsidiary functions. May not be part of measuring equipment. 4（ Electronic Scale is a measurement of the state compulsory test apparatus, and his qualified products are test indexing the value of D values of e and subdivision standards, is subject to the protection o

5、f the national metrology products. In the electronic weighing there is a category called human scale products, which can test in the measurement sector, weighing very precise. Block diagram interpretation of the principle of electronic balance The first part of the electronic scale principle block d

6、iagram:Program K / B （button） ? Fx ? Sensors ? OP Zoom ? A / D converter ? CPU ? ? display driver display memory Workflow Note: When an object on the pan when the pressure facilities to the sensor that occurred deformation, so that resistance to change, while the use of excitation voltage changes, t

7、he output of a change in analog signal. This signal amplification by the amplifier output to the ADC. Converted to facilitate the processing of the digital signal output to the CPU operator control. CPU under the keyboard commands and program output to display this result. Until the show such a resu

8、lt. The second part of the scale of the classification: 1. According to principles of points: E-scale mechanical scale mechanical and electrical integration scales 2. According to the functions sub: Counting Scales Weighing Scale Pricing Scale 3. Purpose: Industrial Commercial Scales Special Scales

9、Balance The third part of the scale types: 1. The full name of the desktop Scale refers to the volume of less than 30Kg electronic scale 2. The full name of platform scale refers to the volume within the 30-300Kg Electronic Scale 3. Loadometer full name refers to the volume of more than 300Kg Electr

10、onic Scale 4. Precision Balance 4th Part of the accuracy of classification: I Class: Special scales precision ? 1 / 10 Wan II level: high-precision scale 1 / 10000 ? precision of 1 / 100,000 III: the accuracy of scale 1 / 1000 ?1 / 10000 Class IV: Common Scale 1 / 100 ? precision of 1 / 1000 Part V

11、of professional terminology: 1. Maximum weighing: an electron balance, excluding tare weight, the maximum load can weigh; 2. Minimum weigh: a electronic scales below the value that would have occurred when a relatively error; 3. safe load: 120% of the normal weighing range; 4. Rated load: normal wei

12、ghing range; 5. permissible error: class test when the maximum deviation; 6. a sense of quantity: a single electronic scales can show the smallest scale; usually d to represent; 7. analytic capacity: a function with a count of the electronic scales, can distinguish the smallest scale; 8. Resolution:

13、 a counting function with an electronic scale, the internal capacity of a Resolution of a parameter; 9. Warm-up time: a scale used to achieve the targets of the time; 10. Accuracy: The full name of a sense of volume and volume ratios; 11. electronic scale use of environmental temperature: -10 degree

14、s Celsius to 40 degrees Celsius 12. platform scale The table size: 25cm X 30cm 30cm X 40cm 40cm X 50cm 42cm X 52cm 45cm X 60cm Part VI electronic scale features: 1. To achieve long-distance operations; 2. To achieve automatic control; 3. Figures show that an intuitive, reduce human error; 4. High ac

15、curacy and resolution strong; 5. Weighing range is wide; 6 . unique features: buckle weight, withholding weight, zero, accumulated, warning, etc.; 7. maintenance simple; 8. size is small; 9. installation, calibration simple; 10. special industry, can be accessed by the printer or computer-driven; 11

16、. Intelligent electronic scale, quick reaction, high efficiency; Part VII of the electronic scale inspection process: 1. First, the overall examination: whether the wear and tear; 2. Whether the boot: the boot sequence is from 0 to 9 in turn shows that figures are vague, can zero; 3. Whether the bac

17、klight ; 4. with the weight tests in weighing; 5. chargers is intact, can use; 6. parts are complete; Part VIII sensor type: 1. Resistive: affordable, high accuracy, widely used; 2. Capacitive: small size, low precision; 3. Maglev-style: special high-precision, high cost; 4. Hydraulic formula: the c

18、urrent the market has been eliminated; Display Type: 1.LCD （liquid crystal display）: free electricity, energy-saving, with backlight; 2.LED: free electricity, power consumption, very bright; 3. Lamp: electricity, power consumption , high; K / B （button） type: 1. film button: contact type; 2. mechani

19、cal buttons: made up of many individual combinations of keys together; sensor characteristics: 1. rated load; 2. output sensitivity; 3. non-linear; 4. hysteresis; 5. repeatable; 6. creep; 7. 12:00 output effects; 8. rated output temperature; 9. 12:00 input; 10. input impedance; 11. output impedance;

20、 12. Insulation Resistance ; 13. to allow excitation voltage; （5-18V） Part IX sensor damaged phenomenon: 1. Weighing not allowed; 2. Shows no return to zero; 3. Shows the number of bounce to judge the sensor + E,-E, + S,-S 1. The first to use resistance profile measurement 4-line 22 This resistance

21、value, a total of 6 groups. The case of 400-450, compared with Europe + E,-E; if it is 350 in Europe, compared to + S,-S; for the 290 in Europe, compared to R-arm; 2. + E,-E terminated on the + 1.5V voltage Sensor correctly to exert a pressure, such as the output + _S increase, then the red table pe

22、ns as + S, the contrary-S; 10th part of the high-precision counting scale features: 1.Kg/Ib unit conversion functions; 2. 12:00 display range adjustment function （GLH series does not） 3. Sampling speed adjustment function; 4. There are 10 groups memory function singlet; 5. may be at the same time th

23、e weight, quantity, the cumulative function （GLH only the number of cumulative） 6. can set the weight, the maximum amount of warning function; 7. automatic zero tracking, temperature linear correction; 8. deduction of withholding heavy weight and function; 9. Standby function; 10. there is zero show

24、s zero tracking range and scope; 11. there is the battery voltage control to limit the function; Electronic scales are weighing technology in a new type of instrument is widely used in various occasions. Electronic scales and mechanical scales have more small size, light weight, simple structure, lo

25、w price and practical value of strong, convenient maintenance and so on can be in a variety of environmental work, the weight of the signal can be Remote, the weight of display is easy to implement digital, easy-to-computer networking, process automation of production and improve labor productivity.

26、 Electronic Scale also has an automatic zero tracking, overload display of self-extinguishing characteristics. Mechanical scales, floor scale / land in the value （car value）, weigh-bridges and other fitted force-sensitive sensors and microcomputer-controlled intelligent weighing instruments become i

27、ntelligent digital electrical and mechanical balance （or the mechanical and electrical dual-use scales）, to improve the mechanical balance of the measurement accuracy, with low cost, high reliability, simple installation and so on, without prejudice to the original mechanical scales to any transmiss

28、ion bearing structure. There are peeled, set to zero, the cumulative number of times, the cumulative weight （cumulative amount of valuation-based）, auto-zeroing, auto-tracking and other functions. Weighing data can be directly printed or transmitted via computer networks, industrial processes can im

29、prove the level of scale and product quality, trade clearing with the scale can improve the credibility of incalculable social and economic benefits. Electronic Scale is basically a sensor, amplifier circuit, A / D conversion circuit, microcontroller control of display parts, switch matrix circuit, the keyboard circuit and power circuit. Weight sensor signals are converted to a corresponding electrical signal, after amplified into the A / D c