What is the difference between an absolute encoder and an adjustable resistor

Absolute encoder is a resistance element whose resistance can be adjusted according to one of the changing laws. In fact, absolute encoder is also called adjustable resistance or variable resistor in foreign countries, but in China, adjustable resistance and absolute encoder It is not a kind of component, there are differences between them, and I will explain it to you in the specific text.

In terms of structure and working principle of adjustable resistors, absolute encoders and adjustable resistors are basically similar, but not all the same, so they also have similarities and differences. What is the difference between absolute encoders and adjustable resistors? The difference, we mainly check from the following points:

　　 1. Handle: Absolute encoders have handles, but adjustable resistors do not.

　　2. Resistance distribution characteristics: The output characteristics of the absolute value encoder have a variety of functional characteristics, and the distribution characteristics of the resistor bodies of different absolute value encoders are different; and the resistor body distribution characteristics of the adjustable resistor are the same.

　　3. Number of connections: Absolute encoders have double absolute encoders, but adjustable resistors do not.

　　4. Volume: The absolute value encoder has a large volume, a firm structure, and a long time to use. Wholesale absolute value encoders From single-turn absolute value encoders to multi-turn absolute value encoders, absolute value rotating single-turn absolute value encoders are used to measure each engraved line of the photoelectric code disc during rotation to obtain a unique code. When it exceeds 360 degrees, the code returns to the original point, which does not comply with the principle of absolute code uniqueness. Such codes can only be used for measurement within a rotation range of 360 degrees, which is called a single-turn absolute encoder. The wire-pulling encoder is a device that converts signals or data into a form that can be used for communication, transmission and storage, and converts angular displacement or linear displacement into electrical signals. The former is called a code disc and the latter is called a code ruler. The signal output of the encoder includes sine wave, square wave, open collector, push-pull and other forms. The adjustable resistor is small in size and has a shorter service life.

5. Anti-interference performance: The metal shell of the absolute encoder is grounded in the circuit (the handle is connected to the shell), so that the interference is relatively small when the absolute encoder is adjusted, and the purpose of suppressing interference can be achieved; and the adjustable resistance has no grounding pin , It will be disturbed by human body induction during adjustment.

6. Installation location and frequency of use: The absolute encoder is installed on the circuit board or on the casing. No matter which installation method is adopted, its handle needs to be extended out of the casing. For easy adjustment, the machine will often Adjust the absolute value encoder; while the adjustable resistor is installed on the circuit board, it is usually not adjusted during use, and the resistance is only adjusted during troubleshooting. There are many optical channel engraved lines on the optical code disc of absolute value encoder, and each engraved line is arranged in 2 lines, 4 lines, 8 lines, and 16 lines in sequence. In this way, at each position of the encoder, by reading each engraved line The opening and darkening of the line obtain a set of unique binary codes from the zero power of 2 to the n-1 power of 2, which is called an n-bit absolute encoder. Such an encoder is memorized by an optical code disc.

　　7. Duration of use: The absolute encoder has a firm structure and a long service life. However, due to the frequent use of the absolute encoder and its mechanical movement, the absolute encoder is often damaged in front of the adjustable resistor in the same machine; the adjustable resistor has a simple structure, improper adjustment is easy to damage, and has a longer life. Short, but because of the low frequency of use, there is no disadvantage of short service life.