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Operator Tutorial
1503C MTDR User Manual
2–3
3. The pulse on the left is the test pulse (incident pulse) leaving the instrument. The
reflected pulse on the right displays the echo coming back. Turn the
n
o
POSITION control clockwise until the cursor rests on the rising edge of the
reflected pulse.
O
N
ac
10.00 ft
O
F
F
O
F
F
O
F
F
Incident
Pulse
Reflected
Pulse
Figure 2–2: Cursor of Rising Edge of Reflected Pulse
The upper right corner should read 10.00 ft. Note that the reflected pulse rises.
This is the classic signature of an open cable, a point of higher impedance.
4. Adjust the VERT SCALE control. This will increase the height of the pulse. For
accurate measurements, the pulse should occupy most of the display. Note that
the LCD shows the VERT SCALE setting in dB. For now, set this control to 7
dB.
O
N
ac
10.00 ft
O
F
F
O
F
F
O
F
F
Open
Figure 2–3: Waveform with VERT SCALE Increased Showing
an Open
5. The
n
o
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.
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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