2
ILLUSTRATIONS
Figure 3-1: Fault Resistance Scale…………………………………………….5
Figure 3-2: Clamping Black Lead to Ground Rod…..…….. ………………...6
Figure 3-3: Clamping Red Lead to Targeted Cable.………………………. ...6
Figure 3-4: Locating the Targeted Cable…………..………………. .… …… 7
Figure 3-5: Positioning of A-Frame Receiver for Synchronization………….8
Figure 3-6: Locating the Cable Fault with A-Frame Receiver…….………. .10
Figure 4-1: Standard Equipment……………. … ……………………………14
Figure 4-2: Transmitter Controls Panel….……..…………… ……………….19
Figure 4-3: A-Frame Controls and Indicators………………………………. 22
Figure 4-4: Battery Status Indication………………………………………….23
Figure 5-1: Typical 480B/SFL Transmitter Connection…….……………… 25
Figure 5-2: Signal Pattern Around Fault and Ground Point……………..… 26
Figure 5-3: Multiple Fault Signal Patterns………………………………….. 28
Figure 6-1: Checkout Test Set-Up…………………………………….……… 29
Figure 7-1: Synchronizing the A-frame……………………………………….32
Figure 7-2: Fault Confirmation………………………………………………. 33
Figure 8-1: Perpendicular Method…………………………………………… 35
Figure 8-2: Triangulation Method…………………………………………… 36
Figure 8-3: Locating an Equipotential Circle……………………………….. 36
Figure 8-4: Fault Location Using Extension Cable for
Increased Sensitivity…………………………………………….. 37
Figure 9-1: Direct (Conductive) Connection……………………………….. 40
Figure 9-2: Peak 480B Receiver Response……………………………………41
Figure 9-3: Null 480B Receiver Response……………………………………41
Figure 9-4: Inductive Coupling with the Metroclamp ……………...………42
Figure 9-5: Estimating the Depth of a Conductor ….. ……………...………45
Figure 9-6: Estimating Conductor Depth with the 4810 Probe …....………46
Figure 9-7: Using two Metroclamps to identify target conductor ....………47
Figure 10-1: A-frame Receiver Battery Replacement…..………. ....………48
