Operating Instructions
1502C MTDR Service Manual
1–13
Cable Test Procedure
Be sure to read the previous paragraphs on Vp.
1. Set the 1502C controls:
POWER On
CABLE Cable to BNC
NOISE FILTER 1 avg
VERT SCALE 500 m
r
DIST/DIV (see below)
Vp (per cable)
2. If you know approximately how long the cable is, set the DIST/DIV
appropriately (e.g., 20-ft cable would occupy four divisions on the LCD if 5
ft/div was used). The entire cable should be displayed.
O
F
F
O
F
F
O
F
F
O
N
ac 0.000 ft
Figure 1–8: 20-ft Cable at 5 ft/div
If the cable length is unknown, set DIST/DIV to 200 ft/div and continue to decrease
the setting until the reflected pulse is visible. Depending on the cable length and the
amount of pulse energy absorbed by the cable, it might be necessary to increase the
VERT SCALE to provide more gain to see the reflected pulse.
O
F
F
O
F
F
O
F
F
O
N
ac 20.000 ft
Short
Figure 1–9: Short in the Cable
Distance to the Fault
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