Calibration
1502C MTDR Service Manual
6–13
O
F
F
O
F
F
O
F
F
O
N
ac –2.000 ft
Figure 6–20: Waveform at Bottom of the Display
5. Remove the 3-ft precision cable.
6. Connect the 50
W
terminator to the CABLE connector.
7. Center the pulse in the display. The pulse should be two divisions high.
O
F
F
O
F
F
O
F
F
O
N
ac –2.000 ft
Figure 6–21: Waveform at Centered
NOTE. If the instrument fails this check, refer to the Troubleshooting section of the
Maintenance chapter of this manual.
Noise Check
If the instrument fails this check, it might still be usable for measurements of large
faults that do not require a lot of gain. A great deal of noise reduction is available
with the NOISE FILTER control.
1. Set the front-panel controls:
CABLE 50
W
terminator
NOISE FILTER 1 avg
VERT SCALE 500 m
r
DIST/DIV 10 ft/div
V
P
.99
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