Measure the Length of Cable by an Oscilloscope

WisdomAugust · Post time 2023-2-6 08:07:38

0.75 square 300V/500V wire

WisdomAugust · Post time 2023-2-3 08:37:50

We will measure the length of the two cables separately.

BNC extension cord

WisdomAugust · Post time 2023-2-1 08:19:11

BNC Connector (female to dual-site of twisted pair cable)

WisdomAugust · Post time 2023-1-12 08:18:56

BNC Tee Adapter ( one male to two female)

BNC Adapter (male to male)

WisdomAugust · Post time 2023-1-11 16:27:28

TDR Pulse Generator

WisdomAugust · Post time 2023-1-10 13:44:42

Experiment Equipment

l Fast edge pulse generator small board

l One oscilloscope supporting 10 nanoseconds or smaller time base

l 5V DC power supply

l To be tested cable

l BNC adapter

WisdomAugust · Post time 2023-1-6 13:04:39

WisdomAugust · Post time 2023-1-5 14:36:52

WisdomAugust · Post time 2023-1-4 08:41:19

The speed of the electrical signal in the cable cannot reach the theoretical speed of light. The ratio

of the speed of light to the actual speed of the electrical signal in the cable is called the velocity factor

or velocity of propagation). Abbreviation: VF or VOP.

For coaxial cables, the speed factor (VF) of the coaxial cable varies with different dielectric materials

WisdomAugust · Post time 2023-1-3 13:11:24

The formula for calculating cable length is as follows

Length calculation formula

L = cable length, unit: meter.

Δt = the time difference between signal transmission and reflection, unit: second.

C = speed of light, unit: meters per second.

VF = cable speed factor, constant, no unit.