Measure the Length of Cable by an Oscilloscope

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

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We will measure the length of the two cables separately.

BNC extension cord

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0.75 square 300V/500V wire

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For all control cable manufacturers this device is very helpful. Because it helps them to measure the length of cable to provide 100% authentic cable to their customers. I will tell about this device to my cable manufacturers friends, this device will definitely help them.

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Experimental procedures

Measure the length of the BNC extension cord

1 Connect the TDR pulse generator and the BNC adapter as follows

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2 Connect the TDR pulse generator to the oscilloscope and insert the to-be-tested BNC extension

cord into the BNC tee adapter as below. Turn on the oscilloscope and 5V DC power supply.

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Use the oscilloscope’s cursor to measure the time difference between the transmitted signal and

the reflected signal.

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As the above screenshot shows, the time difference between the transmitted signal and the

the reflected signal is 16 nanoseconds, which is calculated by using the formula:

The calculated cable length is 1.51 meters, and the actual length of the tested cable is 1.5 meters.

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Measure the length of 0.75 square wire

1 Change a connector to measure the length of the 0.75 square wire.

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