A measuring instrument for measuring the mass (weight) of the object by using gravity acting on the object, and the scale equipped with the electronic device is an electronic scale.

 

The weighing instrument converts gravity into an analog signal of voltage or current through a weight sensor mounted on the mechanism, and is amplified and filtered to be converted into a digital signal by the A/D processor, and the digital signal is calculated by a central processing unit (CPU). Processing, and the peripheral functions and various interface circuits are also connected to the CPU application, and finally displayed by the display screen in a digital manner.

 

Description of the working process of the electronic scale sensor: When the object is placed on the weighing pan, the pressure is applied to the sensor, the sensor is deformed, so that the impedance changes, and the excitation voltage is changed to output a varying analog signal. The signal is amplified by an amplifying circuit and output to an analog to digital converter. The digital signal converted into a convenient processing is output to the CPU arithmetic control. The CPU outputs this result to the display according to keyboard commands and programs. Until this result is displayed.

 

The second part of the classification of scales: 1. According to the principle: electronic scales mechanical scales mechanical and electrical combined scales 2. According to the function points: counting scales price scales weighing scales 3. According to the purpose: industrial scales commercial scales special scales

 

The third part of the scale: 1. Desktop scale refers to the electronic scale with the full weighing below 30Kg 2. The scale refers to the electronic scale with the full weighing within 30-300Kg 3. The weighbridge refers to the electronic scale 4 with the full weighing above 300Kg Precision balance

 

The fourth part is classified according to the accuracy: Class I: Special balance precision ≥1/100,000 Class II: High-precision balance 1/10,000 ≤ Precision <1/100,000 Class III: Medium precision balance 1/1000 ≤ precision <1/1 million class IV: ordinary scale 1/100 ≤ precision <1/1000

 

The fifth part of the terminology: 1. Maximum weighing: One electronic scale does not count the tare, the maximum load that can be weighed; 2. Minimum weighing: a relative scale that occurs when an electronic scale falls below this value Error; 3.Safety load: 120% normal weighing range; 4. Rated load: Normal weighing range; 5. Allowable error: Maximum deviation allowed by level inspection; 6. Sensing: Can be displayed by an electronic scale Minimum scale; usually denoted by “d”; 7. Analytical quantity: an electronic scale with counting function, the smallest scale that can be distinguished; 8. Resolution: An electronic scale with counting function, which has internal resolution One parameter; 9. Warm-up time: The time taken by one scale to reach each index; 10. Accuracy: The ratio of the sensed quantity to the full scale; 11. The ambient temperature of the electronic scale is: -10 degrees Celsius to 40 degrees Celsius 12. Countertop specifications for scales: 25cm X 30cm 30cm X 40cm 40cm X 50cm 42cm X 52cm 45cm X 60cm

 

The characteristics of the sixth part of the electronic scale: 1. to achieve long-distance operation; 2. to achieve automatic control; 3. digital display intuitive, reduce human error; 4. high accuracy, strong resolution; 5. wide range of weighing; Unique features: deduction, pre-deduction, zero, accumulation, warning, etc. 7. Simple maintenance; 8. Small size; 9. Simple installation and calibration; 10. Special industry, can be connected to printer or computer driver; Intelligent electronic scale, fast response and high efficiency;

 

The seventh part of the electronic scale inspection process: 1. First of all the overall inspection: whether there is wear and damage; 2. Can boot: whether it is displayed from 0 to 9 after the boot, whether the number is blurred, whether it can be zero; 3. With or without backlight 4. Can use the weight test to test whether it can be weighed; 5. Whether the charger is in good condition and can be used; 6. Whether the accessories are complete;

 

The eighth part of the electronic scale sensor type: 1. Resistive type: moderate price, high precision, wide use; 2. Capacitive type: small size, low precision; 3. Maglev type: high precision, high cost; 4. Hydraulic type : Now the market has been eliminated; Display type: 1.LCD (liquid crystal display): no plug-in, power saving, with backlight; 2. LED: no plug-in, power consumption, very bright; 3. Lamp: plug-in, Power consumption, very high; K / B (button) type: 1. Membrane button: contact type; 2. Mechanical button: combined by many individual buttons; Sensor characteristics: 1. Rated load; 2. Output sensitivity; 3. Nonlinear; 4. Hysteresis; 5. Repeatability; 6. Creep; 7. Zero output effect; 8. Rated output temperature effect; 9. Zero input; 10. Input impedance; 11. Output impedance; Impedance; 13. Allowable excitation voltage; (5-18V)

 

The ninth part of the sensor damage phenomenon: 1. Weighing is not allowed; 2. The display does not return to zero; 3. The displayed number jumps to determine the sensor's +E, -E, +S, -S 1. First use the resistance file There are 6 groups of resistance values ​​between the 4 lines and the two. If it is 400-450 ohms, it is +E, -E; if it is 350 ohms, it is +S, -S; for 290 ohms, it is R bridge arm; 2. At +E, -E end, it is +_5V Voltage, the sensor correctly applies a pressure, if the output +_S increases, the red test pen is +S, and vice versa -S;

 

The tenth part of the high-precision counting scale features: 1. Kg / Ib unit conversion function; 2. Zero point display range, adjustment function (GLH series does not) 3. Sampling speed adjustment function; 4. There are 10 groups of single-weight memory function; Weight, quantity and accumulation function can be performed at the same time (GLH only has quantity accumulated) 6. Weight and quantity upper limit warning function can be set; 7. Automatic zero point tracking, temperature linear correction; 8. Deduction and pre-deduction function; 9. Standby Function; 10. There are zero display range and zero tracking range; 11. There is battery voltage regulation limit function;