Contents
4. Operating Instructions 39
4.1. Connecting to the Cable or
Device-Under-Test (DUT) . . . . . 39
4.2. Common Types of TDR Cable Faults 40
4.3. Change Velocity of Propagation (Vp) 42
4.3.1. Fine Vp Control . . . . . . 42
4.4. Find an Unknown Velocity of
Propagation (Vp) . . . . . . . . . . 42
4.5. Cable Type Library . . . . . . . . 45
4.5.1. Load a Cable Type’s Vp . . 45
4.5.2. Custom Cable Types . . . . 45
4.6. Smooth Settings . . . . . . . . . . 45
4.7. Distance-to-Fault . . . . . . . . . . 46
4.7.1. Measure Distance-to-Fault
(DTF) . . . . . . . . . . . . 46
4.7.2. Relative Distance and
DTF Measurements . . . . 48
4.7.3. Multi-Segment Cable DTF
Measurements . . . . . . . 51
4.8. Scan a Cable . . . . . . . . . . . . 53
4.9. Working With Traces . . . . . . . 54
4.9.1. Select a Trace . . . . . . . . 54
4.9.2. Annotate a Trace . . . . . . 56
4.9.3. Store a Trace . . . . . . . . 60
4.9.4. Load a Trace (Cable
Records) . . . . . . . . . . . 62
4.9.5. Transfer and Delete Traces 63
4.10. User Configurations . . . . . . . . 64
4.10.1. Save Configurations . . . . 65
4.10.2. Load Configurations . . . . 65
4.11. Mask Testing . . . . . . . . . . . . 65
4.11.1. Storing a Mask . . . . . . . 67
4.11.2. Loading a Mask . . . . . . 67
4.11.3. Saving and Loading a
Mask as Part of a Con-
figuration . . . . . . . . . . 67
4.11.4. Exporting/Importing a Mask 67
4.11.5. Deleting a Mask . . . . . . 68
4.12. Envelope Plot (Transient/Intermittent
Fault Detection) . . . . . . . . . . 68
4.13. Improving Measurements . . . . . 71
4.13.1. Vertical Reference (Vert.
Ref.) Calibration . . . . . . 71
4.13.2. Cable Resistive Loss Cor-
rection . . . . . . . . . . . . 72
4.14. Take a Screenshot . . . . . . . . . 73
4.15. Web Server . . . . . . . . . . . . . 74
4.16. Remote Control . . . . . . . . . . . 75
5. Math Functions 77
5.1. Difference (Subtraction) Traces . . 77
5.2. First Derivative (Slope) Traces . . 78
5.2.1. Second and Higher Order
Derivative Traces . . . . . . 79
5.3. Fast Fourier Transform (FFT)
Traces . . . . . . . . . . . . . . . . 79
5.4. Return Loss (S
11
) Traces . . . . . . 80
5.5. Return Loss (S
11
) Options . . . . . 81
5.5.1. Return Loss (S
11
) Pre-Filter 82
5.5.2. Return Loss (S
11
) Post-Filter 82
5.5.3. Return Loss (S
11
) Phase
Correction . . . . . . . . . . 82
5.5.4. Time-Domain Gating, or
Return Loss (S
11
) Between
Cursors . . . . . . . . . . . 83
5.5.5. Return Loss (S
11
) Calibra-
tion Standards . . . . . . . 84
5.5.6. Other Return Loss (S
11
)
Options . . . . . . . . . . . 85
5.6. Improving S-Parameter Measure-
ments . . . . . . . . . . . . . . . . 85
5.7. Normalized TDR Traces . . . . . . 86
5.8. Layer-Peeling (Dynamic Deconvo-
lution) Traces . . . . . . . . . . . . 87
5.9. Smith Charts . . . . . . . . . . . . 88
6. CT Viewer 91
6.1. Transferring Saved Traces to a
Computer . . . . . . . . . . . . . . 91
6.1.1. Send Saved Traces with a
Thumb Drive . . . . . . . . 91
6.1.2. Send Saved Traces over USB 92
6.1.3. Send Saved Traces Using
Ethernet . . . . . . . . . . . 92
6.2. Using Remote Control . . . . . . . 94
6.2.1. Record and Playback Real-
Time TDR Trace Movies . 94
7. TDR Measurement Theory 95
7.1. Time-Domain Reflectometry (TDR) 95
7.2. Reflection Coefficients . . . . . . . 95
7.3. Common Types of TDR Cable Faults 96
7.4. Velocity of Propagation (VoP, Vp) 99
7.5. Distance-to-Fault (DTF) and Ca-
ble Length . . . . . . . . . . . . . . 99
7.6. Impedance . . . . . . . . . . . . . . 99
7.7. Return Loss . . . . . . . . . . . . . 101
x CT100B TDR Cable Analyzers Operator’s Manual
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