MR-ENECBL Position Encoder Interface Connection Cable 7m

For twisted-pair cables for Position Encoder Interface, users are most concerned about several indicators that characterize their performance. These indicators include attenuation, near-end crosstalk, impedance characteristics, distributed capacitance, DC resistance, etc.

(1) Attenuation of twisted pair power lines
Attenuation is a measure of signal loss along a link. The attenuation is related to the length of the cable. As the length increases, the signal attenuation also increases. Attenuation is expressed in “db” as the ratio of the signal strength at the source transmitter to the signal strength at the receiver. Since attenuation varies with frequency, the attenuation should be measured at all frequencies within the application range.
(2) Near-end crosstalk on twisted-pair power lines
Crosstalk is divided into near-end crosstalk and far-end crosstalk (FEXT). The tester mainly measures NEXT. Due to line loss, the value of FEXT has little influence. Near-end crosstalk (NEXT) loss is a measure of signal coupling from one pair of wires to another in a UTP link. For UTP links, NEXT is a key performance indicator, and it is also the most difficult indicator to measure accurately. As the signal frequency increases, its measurement difficulty will increase. NEXT does not represent the crosstalk value generated at the near-end point, it just represents the crosstalk value measured at the near-end point. This value will vary with the length of the cable, the longer the cable, the smaller the value becomes. At the same time, the signal at the sending end will also be attenuated, and the crosstalk to other wire pairs will be relatively smaller. Experiments have proved that only the NEXT measured within 40 meters is more real. If the other end is an information socket farther than 40 meters, it will produce a certain degree of crosstalk, but the tester may not be able to measure this crosstalk value. Therefore, it is best to perform NEXT measurements at both endpoints. The tester is equipped with corresponding equipment, so that the NEXT value at both ends can be measured at one end of the link.
(3) DC resistance of twisted-pair power lines
TSB67 does not have this parameter. The DC loop resistance dissipates a portion of the signal and turns it into heat. It refers to the sum of the resistance of a pair of wires, and the DC resistance of the 11801 twisted pair shall not be greater than 19.2 ohms. The difference between each pair should not be too large (less than 0.1 ohm), otherwise it means poor contact and the connection point must be checked.
(4) Characteristic impedance of twisted pair power line
Different from the direct current resistance of the loop, the characteristic impedance includes resistance, inductive impedance and capacitive impedance with a frequency of 1 to 100 MHz. It is related to the distance between a pair of wires and the electrical properties of the insulator. Various cables have different characteristic impedances, and twisted pair cables are available in 100 ohms, 120 ohms and 150 ohms.