Wire and cable length measurement

Cable is an indispensable basic equipment for power transmission, information transmission, manufacturing of various motors, electrical appliances, instruments and Realization of electromagnetic energy conversion. It is widely used in various fields of national economy. As an important quantitative packaging length commodity, the net content of cable should be measured and tested in production and operation. In fact, because the cable length measurement and inspection must be carried out in a whole volume, which is inconvenient for measurement, many manufacturers and businesses have not carried out according to the allowable length measurement error specified in the national standard, which leads to the increasingly prominent measurement problems in the market. To measure the cable length accurately, quickly and economically can not only improve the product quality and reduce the consumption, but also implement and standardize the calibration of measuring instruments for cable quantitative packaging, supervise the law enforcement, ensure the accuracy and reliability of the net content of cable quantitative packaging, safeguard the interests of production enterprises and consumers, and enhance the cable production enterprises in the domestic and international markets Competitiveness plays an important role.

Chongqing puls Technology Co., Ltd. puts forward a method for measuring the length of power cable. The Gaussian pulse signal used for length measurement is input at one end of the power cable to be tested. According to the time delay and electromagnetic wave velocity calibration of the reflected echo signal at the other end of the cable, the cable length can be accurately obtained. Compared with the square wave pulse excitation in the existing technology, this method reduces the length measurement error caused by the judgment error of the peak point and the rising edge turning point, thus improving the measurement accuracy. At the same time, through the calibration of the cable to be tested before each measurement, it eliminates the adverse effects of cable aging and material characteristics differences of manufacturers on the length measurement accuracy, and improves the cable length Measurement accuracy.

1. High voltage Gaussian pulse wave is incident at the cable head end;

2. Reflected pulse wave at the end of cable;

3. Cable to be tested;

4. Cable core to be tested;

5. Shielding layer of cable to be tested;

Principle of cable length measurement