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Operator Tutorial
1503C MTDR User Manual
2–9
CABLE LENGTH
SUGGESTED PULSE
SUGGESTED ft/div
0 to 100 ft
2 ns
10 ft/div
51 to 500 ft
10 ns
50 ft/div
501 to 5000 ft
100 ns
500 ft/div
5001 to 50,000 ft
1000 ns
5000 ft/div
Noise
On a longer cable, “grass” might appear on the displayed waveform. This is
primarily caused by the cable acting as an antenna, picking up nearby electrical
noise.
1. Set the 1503C front-panel controls:
CABLE
10-ft cable
IMPEDANCE
93
NOISE FILTER
1 avg
VERT SCALE
0.00 dB
DIST/DIV
1 ft (0.25 m)
Vp
.84
PULSE WIDTH
2 ns
n
o
POSITION
50.0 ft
2. Attach the 50 terminator to the end of the test cable using the female-to-fe-
male BNC adaptor (both of these items are supplied with the instrument).
3. Increase VERT SCALE to 50 dB. Use the
n
o
POSITION control to keep the
waveform on the display. As the VERT SCALE setting increases, there will be
noise in the form of a moving, fuzz-like waveform with a few random spikes.
O
N
ac
50.00 ft
O
F
F
O
F
F
O
F
F
Figure 2–14: Noise on the Waveform.
4. Turn the NOISE FILTER control clockwise to 8. This will average out much
of the noise.
Summary of Contents for 1503C
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Page 92: ...Appendix A Specifications A 6 1503C MTDR User Manual...
Page 104: ...Appendis B Operator Performance Checks B 12 1503C MTDR User Manual...
Page 122: ...Glossary Glossary 6 1503C MTDR User Manual...
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