AALogic SNOOPY SR-101 Manual

Cable Fault Location System - Aerial Fault Location Quick Reference
This quick reference provides abbreviated guidelines on the use of the Cable Fault Location System (Snoopy) for locating
Aerial resistive cable faults.
S
AFETY
All prescribed safety precautions and procedures must b e observed while using the SR-101 equipment.
Failure to do so can result in serious injury or death.
T F
YPES OF AULTS
The following resistive faults may be located:
•
Tip connected to Ring
Short
•
Tip or Ring of one pair is connected to the Tip or Ring of another pair
Cross
•
Split Tip or Ring of one pair is split with the Tip or Ring of another pair
✓
The cable length beyond the fault should be as short as possible.
F P -T
AULT RE ESTING
The technician must identify the type of fault, estimate the distance, and section the pair(s) using local practice
procedures. The far end of the section should be less than 35% of the section length if possible.
P S
AIR PLITS
The diagram below shows a split and how to place temporary short at the far end of the section and connect the
transmitter clips.
F L
AULT OCATION

Transmitter Setup

Cable Fault Location System Aerial Fault Location QR V 1.2
Pair 1 Pair 1 Pair 1 Pair 1 Pair 1 Pair 1
TIP TIP TIP TIP TIP TIP TIP TIP
T T T T T T T T
R R R R R R R R
RING RING RING RING RING RING RING RING
TIP TIP TIP TIP TIP TIP TIP TIP
T T T T T T T T
R R R R R R R R
Pair 2 Pair 2 Pair 2 Pair 2 Pair 2 Pair 2
RING RING RING RING RING RING RING RING
Locating a Split Locating a Split Locating a Split Locating a Split
1. The ST-101 should be positioned at one end of the cable section. The length past the fault,
the far-end opposite the transmitter, should be minimized, to reduce carry-by of the tone.
2. Connect the transmitter clips to the fault as follows:
Fault
Short
Cross
Split
3. The transmitter "Auto-Set" function serves as a general guideline for frequency and
[LEVEL] settings.
4. Turn on the transmitter and use Auto-Set for the transmitter initial frequency and power
settings or use 335Hz. The PWR OUT indication should be near mid-scale.
5. The following guidelines help manually adjust the frequency based on the cable section
length if needed:
Freq (Hz)
Temporary Temporary Temporary Temporary
Short Short Short Short
Connections
Tip and Ring of the shorted pair.
The two wires that are crossed
The split wires. See paragraph 4.
Resistance Limits In Ohms (Ω
Section Length (Feet)
500 1000 5000
145 95,900
48,000 19,200
335 41,500
20,800 8,300
577 24,100
12,100 4,800
987 14,100
7,000 2,800
2000
7,000 3,500 1,400
)
10000 20000 40000
9,600 4,800 2,400
4,200 2,100 1,000
2,400 1,200 600
1,400 700 400
700 300 200
1