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Operator Tutorial
1503C MTDR User Manual
2–13
The VERT SET REF function allows manual control of the vertical calibration of
the 1503C. This can be used to compensate for cable loss or to increase the
resolution of the return loss measurements. The following example shows how to
compensate for cable loss.
The reflection from an open or a short at the far end of a long cable is often less than
two divisions high at 0.00 dB. This is because of the energy lost in the cable before
it gets to that fault. Here is how to correct for this loss and be able to make accurate
measurements at the far end of the cable.
1. Connect the test cable.
2. Turn the NOISE FILTER all the way counterclockwise to VERT SET REF. A
prompt will appear and the LCD will indicate set ref.
O
F
F
O
F
F
O
F
F
O
N
ac
0.00 ft
Figure 2–20: Display with 10-ft Cable and NOISE FILTER turned to VERT SET REF
3. Adjust the VERT SCALE control until the reflection from the open is two
divisions high.
O
F
F
O
F
F
O
F
F
O
N
ac
0.00 ft
Figure 2–21: VERT SCALE adjusted to Make Pulse Two Divisions High
4. Push STORE and return NOISE FILTER to the desired setting.
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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