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Operator Tutorial
2–4
1502C MTDR User Manual
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ac 3.000 ft
Open
Figure 2–3: Waveform with VERT SCALE Increased Showing an Open
5. The
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POSITION control moves the waveform up and down the display.
Adjust this for best viewing.
6. Short the end of the cable with an electrical clip or other suitable device. See
the pulse take a dive? That is the classic signature of a short, a point of lower
impedance.
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ac 3.000 ft
Short
Figure 2–4: Waveform with Short
The distance window still reads 3.000 ft. If the short is not directly across the
conductors of the BNC (e.g., needle nose pliers) the downward edge of the
waveform might be slightly past the cursor, indicating the length of the
shorting device (e.g., jumper wire).
7. Remove the short.
With a little practice, you will be able to identify many kinds of cable faults.