On the calibration of measuring instruments

In scientific measurement, the calibration is an important step that can not be ignored. It is difficult to achieve the best measurement results when using the ultrasonic range finder.

The basic meaning of the calibration:

The accuracy (accuracy) of the instrument used in the measurement of the accuracy of the instrument is in accordance with the standards, generally used in high precision instruments.

Two, the main role of calibration is:

1 determining the input and output relationship of the instrument or measuring system, giving the instrument or measuring system's index value;

2 determining the static characteristics of the instrument or measuring system;

3 eliminate systematic errors and improve the accuracy of the instrument or system.

Three, ultrasonic product user site simple calibration method:

Placed ultrasonic range finder, the with the tested object relative distances remained unchanged, with a ruler for measuring the ultrasonic range finder and the measured relative to the shortest distance between and the shortest distance and ultrasonic range finder to measure values are compared and the relative difference between them is the user to carry out systematic error correction, under normal circumstances, under the same environmental conditions, the error of the system is in the full range remained unchanged, as long as the user in measurement results or minus the error can get accurate measurements.

Four, in the calibration of ultrasonic products, the placement of ultrasonic range finder should pay attention to the following questions:

1 away from the measuring blind area

2 ultrasonic range finder and the measured object to maintain the relative vertical

3 to ensure that the ultrasonic ranging from no other obstacles

Waterproof ultrasonic distance meter 5 meters (shell)

HM-UL05M-213

One, characteristic:

1, the use of ultrasonic measuring distance, measuring range: 0.3 – 5 meters;

2, measurement accuracy: 1CM

3, shell: plastic, waterproof

4, work mode: request response / continuous active transmission (user optional)

5, communication interface: RS232/485/TTL (user selectable)

6, four: core aviation plug connector

7, sampling frequency: 15Hz

Two, performance:

1, accurate measurement, good repeatability

2, the system is stable, with high performance processor, can be used in industrial environment

Three, typical users:

1, the highway monitoring vehicle traffic, car shape, speed

2, measuring the oil level in oil field

3, river water height measurement

4, vehicle positioning

5, the terminal of the station on the lower cargo anti collision

6, the teaching system of teachers and students