Briefly describe the classification and purchase principle of electronic balance

Balances are weighing instruments that weigh the mass of an object. Electronic balances have the characteristics of simple structure, convenient and practical, and fast weighing speed. They are currently widely used in enterprises and laboratories. Electronic balances are generally used to determine the quality of objects. Electronic balances are generally classified according to accuracy and can be divided into the following categories:

(1) The level below 1mg is called electronic precision balance

(2) 0.1mg is called electronic analytical balance

(3) 0.01mg is called quasi-microbalance

(4) 1ug is called microbalance

(5) The specific conversion ratio of the ultra-micro electronic balance called 0.1ug and above is as follows: 100mg = 0.1g = one tenth 10mg = 0.01g = one hundredth 1mg = 0.001g = one thousandth 0.1mg = 0.0001 g = 10,000ths 0.01mg = 0.00001g = 100,000ths 1μg = 0.001mg = 0.000001g = 10,000ths 0.1μg = 0.0001mg = 0.0000001g = 10,000ths

When purchasing a balance, users need to know several main technical parameters:

1. Full weighing: The maximum mass value (full load value) that the balance can weigh, often expressed in units of "grams" (g).

2. Sensing: the maximum mass required to turn the balance pointer from the balanced position to one division of the dial. Therefore, the sensation is also called "division value", often expressed in units of "mg" (mg). The smaller this value, the more sensitive the balance.

3. Unequal arm: refers to the maximum weighing error caused by the unequal arms (the distance from the middle blade to the left and right blades), often in units of "mg" or "dividing". Sometimes, it is also called "deviation".

4. Variability: refers to the balance after balance, because the crossbar system rises and falls several times, which causes the maximum deviation of the pointer's balance position before and after, which is often measured in units of "mg" or "dividing". This is a parameter that signifies the stability of the balance.

5. Balance level: According to China's current standards, it is divided into 10 levels according to the ratio of the balance's nominal inductance to the balance's full weight.

6. Travel code scale error: refers to the maximum mass error between the weight measured by the travel code dialed on each scale position of the scale and the corresponding standard weight. Also called "riding code scale error" or "riding code error".

7. Nominal value and verification value: The instructions provided with various balances are marked with the above six technical parameters. These six technical parameters are indicators that comprehensively measure the measurement performance of the balance, but do not reflect the actual situation of the measurement performance of the balance. Therefore, it is called "nominal value" or "nominal value". The actual situation of the measurement performance of the balance can only be known after the verification value is calculated according to the prescribed procedures. Newly purchased balances or repaired balances, the verification value should be no more than the nominal value (accurately, it should be "attained to the nominal level"); some indicators of the balance in use (such as unequal arm) Can relax a little. The operation method of the electronic balance is simple, the user who purchases for the first time can refer to the instruction manual for operation, and generally does not need professional installation and debugging.

The following is a picture of 0.01 / 0.1mg of European Redwell electronic balance

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