One: Definition of electronic balance:
The balance is weighed by the principle of electromagnetic force or electromagnetic torque balance.
Two: Classification of electronic balances: Sensors used according to construction can be divided into three categories: strain gauge electronic balances, ceramic sensor electronic balances, and electronic magnetic electronic balances. The strain gauge electronic balance has a small range and low precision. The ceramic sensor electronic balance has a large range and low precision. The electromagnetic force balance applies the principle of electronic magnetic force with the characteristics of high precision and high stability, but the range is not high.
Three: Measure the performance parameters of the electronic balance: stability, linear accuracy, repeatability, sensitivity, and service life.
1. Stability: Stability in electronic balances can be divided into: instantaneous stability and long-term stability (creep). Instantaneous stability means that the value displayed by the electronic balance immediately after the balance is placed on the object is displayed and remains unchanged; long-term stability: the electronic balance does not change much in the ambient temperature, and the same test object weight is maintained for a long time after power-on. The difference in variation over different time periods. The smaller the difference of the above parameters, the stable performance of the electronic balance.
2. Linear accuracy: refers to the accuracy of each point of the electronic balance in the weighing range. (Note: The electronic balance consists of several weighing points within the weighing range. For example, the electronic balance of 300g is 0.1g, 0.11g, 0.12g, 0.13g, 0.14g, 1.00g, 1.13g, 5.00g, 10.00g , 20.01g ... to 299.99g, 300.00g and other points.). The more weighing points you measure during the purchase, the better you can buy a good electronic balance. A poor quality electronic balance is accurate only at the weight calibration point. Other weighing points may have a large difference. Each weighing point can be measured by a standard weight. The higher the accuracy level of the weight, the better the accuracy of the weighing point.
3. Repeatability: In the electronic balance, it refers to the weight of the same measured object, repeated weighing repeatedly, and the difference between the values ​​is displayed every time. The smaller the difference, the better. For example, 50.00g, 50.01g, 49.90g, 49.99g, 50.10g, the smaller the difference between them, the better.
4. Sensitivity: In electronic balances, it refers to the time limit of resolution and resolution. The resolution refers to the verification index value e or the display resolution d value is as small as possible (high sensitivity). Reflecting the time limit, the electronic balance adds a sensitivity and the value is increased by a sensitivity value as short as possible. Nodding instrument analysis experts believe that the electronic balance reflects fast and high sensitivity.
5. Service life: The service life refers to the estimated period during which the enterprise uses fixed assets, or the quantity of products or services that the fixed assets can produce. The longer the life, the better. The customer can provide the supplier with the characteristics of the electronic balance's warranty period to measure the life of the electronic balance.
Medical Nursing Training Model
This model is developed for nurse training, is widely used in first aid and emergency rescue as well as the regular nurse training. This model is made according to the normal position and activities of the human body as much as possible. Each model is equipped with male and female genitalia, can exchange to use. Model of the arms, thigh and buttock have injection pads available training. This model is equipped with internal organs, not only for basic nursing, medical care available to use also. Made of PVC.
Nursing Manikin Model,Medical Training Model,Training Theories And Models,Medical Nursing Training Model
Xinxiang Vic Science&Education Co.,Ltd. , https://www.hnmedicalsciencemodel.com