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Appendix D: Application Note

1502C MTDR User Manual

D–9

Time vs. Long Distances, in Meters or Feet (any dielectric)

Distances to or between discontinuities farther apart than about three meters

(10 feet) can be found on the METERS and FEET scale. Use the sliding

ROUND TRIP TIME scale just below it and follow the same procedure as

above.

METERS FEET

ONE–WAY DISTANCE

TO OR BETWEEN FAULT, SPLICE,

CONNECTOR, LOAD, END, OR OTHER

IMPEDANCE DISCONTINUITY

20 30 40 50 60 70 80

DIELECTRIC

CONSTANT

ROUND

TRIP

TIME

VELOCITY

FACTOR

1.0 1.5 2.0 3 4 5 6

1.0 .8 .7 .6 .5 .4

00ns 150ns 200ns 300ns 500ns 700n

Dieletric is Solid

Time = 300 ns

Velocity Factor = .66

Distance is

30 m or 99 ft

Polyethylene

100 15

Figure D–8: Dielectric Constant and Velocity Factor, Long Distance

Table of Contents6
General Information12
Installation and Repacking13
Table I: Shipping Carton Test Strength14
Safety Summary16
Operating Instructions20
Overview20
Figure 1-1: Rear Panel Voltage Selector, Fuse, AC Receptacle21
Table 1-1: Fuse and Voltage Ratings21
Figure 1-2: Display Showing Low Battery Indication22
Preparing to Use the 1502C24
Figure 1-3: 1502C Front-Panel Controls24
Display25
Figure 1-4: Display and Indicators25
Front-Panel Controls26
Menu Selections27
Test Preparations31
Table 1-2: Vp of Various Dielectric Types31
Figure 1-5: Vp Set at .30, Cursor Beyond Reflected Pulse32
Figure 1-6: Vp Set at .99, Cursor Less than Reflected Pulse32
Figure 1-7: Vp Set at .66, Cursor at Reflected Pulse32
Cable Test Procedure33
Figure 1-8: 20-Ft Cable at 5 Ft/DIV33
Figure 1-9: Short in the Cable34
Figure 1-10: Open in the Cable34
Figure 1-11: 455-Ft Cable35
Figure 1-12: 455-Ft Cable35
Figure 1-13: Reflection Adjusted to One Division in Height36
Figure 1-14: Return Loss37
Figure 1-15: Ohms-At-Cursor38
Figure 1-16: Display with VIEW INPUT Turned off39
Figure 1-17: Display of a Stored Waveform39
Figure 1-18: Display of a Stored Waveform40
Figure 1-19: Waveform Moved to Top Half of Display41
Figure 1-20: Current Waveform Centered, Stored Waveform41
Figure 1-21: Current Waveform Center, Stored Waveform Above, Difference below42
Figure 1-22: Waveform of Three-Foot Lead-In Cable43
Figure 1-23: Cursor Moved to End of Three-Foot Lead-In Cable43
Figure 1-24: Cursor Moved to End of Three-Foot Lead-In Cable44
Figure 1-25: Cursor Moved to 0.00 Ft44
Figure 1-26: Incident Pulse at Three Divisions45
Figure 1-27: Waveform of Short 75 Ohm Cable46
Figure 1-28: Waveform Centered and Adjusted Vertically46
Figure 1-29: Cursor Moved to Desired Position47
Additional Features (Menu Selected)48
Figure 1-30: Waveform Viewed in Normal Operation48
Figure 1-31: Waveform Showing Intermittent Changes49
Operator Tutorial52
What Is the Tektronix 1502C52
How Does It Do It52
You, the Operator52
Menus and Help52
Getting Started53
The Waveform up Close56
A Longer Cable58
Ohms-At-Cursor59
Noise62
Set Ref (Delta Mode)64
View Input68
STORE and VIEW STORE69
View Diff71
Menu-Accessed Functions72
TDR Questions and Answers77
Options and Accessories80
Option 04: YT-1 Chart Recorder80
Option 05: Metric Default80
Option 07: YT-1S Chart Recorder80
Power Cord Options80
Test Data Record Option81
Option de81
Accessories81
Appendix A: Specifications84
Electrical Characteristics84
Table A-1: Electrical Characteristics84
Environmental Characteristics86
Table A-2: Environmental Characteristics86
Certifications and Compliances87
Physical Characteristics88
Table A-3: Physical Characteristics88
Appendix B: Operator Performance Checks90
Appendix C: Operator Troubleshooting102
Error Messages104
Appendix D: Application Note108
Pulse Echo Testing of Electrical Transmission Lines108
Using the Tektronix Time-Domain Reflectometry Slide Rule108
Terms and Symbols108
Relationships109
VSWR Vs. Percent Reflected Voltage109
Return Loss (Db) Vs. Percent Reflected Voltage110
Percent Reflected Voltage Vs. Characteristic Line Impedance111
Percent Reflected Voltage Vs. Load Resistance113
Characteristic Line Impedance or Load Resistance Vs. Reflection Amplitude113
Centimeters Vs. Inches or Meters Vs. Feet114
Dielectric Constant Vs. Velocity Factor115
Time Vs. Short Distances, in Centimeters or Inches (any Dielectric115
Time Vs. Long Distances, in Meters or Feet (any Dielectric116
Glossary118

Brand	Tektronix
Model	1502C
Category	Measuring Instruments
Language	English

Tektronix 1502C User Manual

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