Tektronix 1502C User Manual page 55

Operator Tutorial
2–4
ac
O
N
O
F
F
O
F
F
O
F
F
Figure 2–3: Waveform with VERT SCALE Increased Showing an Open
n
5. The POSITION control moves the waveform up and down the display.
o
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.
ac
O
N
O
F
F
O
F
F
O
F
F
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.
3.000 ft
Open
3.000 ft
Short
1502C MTDR User Manual