Around us is a lot of different objects, including devices. Some of them are intended for everyday life, some are for production, and some are laboratory equipment that allows scientists to move science forward. What unites these devices is that they have specific characteristics, knowing which, a person can visualize the functionality of the device. The nominal value is one of the types of values that can be used in working with equipment.
Nominal value of measurement parameters
You need to understand: in order to collect reliable data, you need to focus on long measurements and experiments. Whereas the nominal value is primarily the attributed value, that is, the theoretical one. Relying on it is only possible when choosing the most suitable equipment to obtain more accurate data that reflect reality. In some cases, the device itself is subject to calibration, during which the nominal value of the parameter is compared with the real, actual value.
As a rule, the nominal value is expressed in certain units and is issued by a reading device having a scale and a pointer. It is the data indicated on the scale that can be fully called the nominal data on the device.
For example: a kitchen mechanical scale has a scale with divisions and an arrow pointer. Division is the space between two marks of the scale, which has the so-called division price - this is the difference between the values of neighboring marks of the scale.
Different devices can have several scales with different characteristics and specifying different indicators.
Actual value
The actual value of a particular equipment parameter is determined by the calibration method. To do this, use the so-called reference device - a device with already measured values of the desired indicator. With his testimony and compare the readings of calibrated equipment. As a result, after successful calibration, the correspondence of the nominal and actual values of the equipment is determined.
In production and in scientific laboratories, equipment is calibrated without fail in accordance with regulatory documentation. Whereas in everyday life, most often you can freely rely on the values indicated by the manufacturer and not double-check them. However, if, for example, the nominal value of the power of a household appliance deviates significantly from the actual one, this may become a reason for contacting the service. Therefore, sometimes it should, albeit by eye, but determine the approximate conformity of the household appliance with the stated parameters.
How are defined
As already mentioned, the nominal value is, first of all, specified by the manufacturer and installed during the manufacture of the device. Even at the development stage, engineers calculate what values of the characteristics must be obtained and in the process of assembling the finished thing, the compliance of the design data with the result is controlled. Therefore, the consumer can be sure that the nominal values are a complete analogue of actually issued.
Why do you need to know both values
The main function of the data indicated by the manufacturer is, of course, to simplify orientation in many types of equipment for the end user. It is according to the characteristics that most people choose their kitchen appliances, gadgets and household appliances. And the purchase of production or laboratory equipment is always associated with accurate knowledge of why and what will be used purchased. In this case, the control of all indicators is normalized by documents and is regularly checked by special bodies.