There are three goals of precision: precision, correctness, and precision.
precision
It sheds light on the sloppy nature of the measurement results. That is, for a certain stable target (to be measured), the same measurer uses the same sensor and measuring instrument to repeat the measurement multiple times (equal precision measurement) in an appropriate short period of time, and the degree of sloppiness of the measurement results. The smaller the precision, the more precise the measurement (corresponding to random errors).
Correctness
Clarify the degree to which the measurement result violates the true value, that is, the degree to which the indication value has rules and violates the true value. Refers to the degree to which the measured value is compounded with the true value (corresponding to the system error).
precision
Accuracy is an inductive reflection of the correctness and precision of measurement. That is, the degree of inductive excellence measured. In the abbreviating case, the algebraic sum of the two can be taken, i.e., τ = ε + δ. Accuracy is usually expressed in terms of the relative value of the measurement error.
How do these three connect?
The results of repeated measurements are relatively common, but the errors are large - there is precision, but there is no accuracy.
Most of the results measured repeatedly are accurate, but the commonality is poor - there is accuracy, but there is no precision.
Most of the results measured repeatedly are accurate, and the commonality is good - there is accuracy, there is precision - there is precision.
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Points to note for encoder installation
1. Each electrical interface has its own characteristics, but also has different baud rate and transmission interval, which can be selected according to the specific application environment of the site, and the actual transmission interval is very related to the transmission rate, encoder and communication cable installation disturbance environment, grounding, cable material selection, etc.
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The first is the four-wire connection method.
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Introduction of P+F photoelectric sensors
A photoelectric sensor is a device that converts optical signals into electrical signals. Its principle of operation is based on the photoelectric effect. The photoelectric effect refers to the phenomenon that when light hits some substances, the electrons of the matter absorb the energy of the photons, and 7 the corresponding electrical effect occurs. According to the different phenomena of the photoelectric effect, the light ...
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Classification and working methods of photoelectric sensors – we are blessed
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No output problems with pressure transmitters – a blessing
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The wiring of the load cell – we are responsible
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One is the four-wire connection method
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Common faults of displacement sensors – we are blessed
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P+F precautions for the use of safety barriers
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