1. Trouble Shooting with EFL 10
Which one is the Proper Fault Location Method ?
Typical Cable Problems
Insulation
Faults
Flooded
cable
R b ≠ R a
C b ≠ C a
Recommended Fault Location Method ▼
To learn more click on the selected method!
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2. Recommended when only one wire of the tested pair is faulty.
Murray Method
Recommended when only one wire of the tested pair is faulty.
The result of Murray measurement is: Lx/L
In addition EFL 10 provides:
  ■ RL loop resistance
  ■ FaE insulation resistance
  ■ Rx resistance to fault
■ Lx distance to fault
The conditions of accurate results: 
■ Ia and Ib < 450 uA 
■ Ф wire a=Ф wire b 
■ FbE>1000 x FaE 
■ FbE>10 MOhm
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3. Recommended when both wires of the tested pair are faulty.
Küpfmüller Method
Recommended when both wires of the tested pair are faulty.
The Küpfmüller method consists of 2 measurements:
  ■ First measurement with open far end
  ■ Second measurement with strap on the far end 
The result of Küpfmüller measurement is: Lx/L
In addition ECFL 30 provides:
  ■ RL loop resistance
  ■ FaE and FbE insulation resistances
  ■ Rx resistance to fault
■ Lx distance to fault
The conditions of accurate results: 
■ Ia and Ib < 450 uA 
■ Ф wire a=Ф wire b 
■ 0,5>FaE / FbE>2 
■ FaE + FbE>100 x R loop
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4. 3-Point Method ELEKTR NIKA
Recommended when the gauge of wires in a pair are different
(two healthy auxiliary wires are necessary)
The 3-Point method consists of 3 measurements:
  ■ First measurement when the measuring voltage is connected to wire a
  ■ Second measurement when the measuring voltage is connected to the ground
  ■ Third measurement when the measuring voltage is connected to wire c
The result of 3 Point measurement is: Lx/L
In addition EFL 10 provides:
  ■ RL loop resistance
  ■ FaE insulation resistance
  ■ Rx resistance to fault
■ Lx distance to fault
The conditions of accurate results: 
■ Ia and Ib < 450 uA
■ The insulation resistance of auxiliary
wires must be thousand time as high
than that of the faulty one.  
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5. Resistance Difference Measurement
EFL 10 provides the following results: Ra, Rb, Rloop, Δ R, %
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6. Capacitance Unbalance Measurement
EFL 10 provides the following results: CaE, CbE, ΔC nF, Δ %
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7. THANK YOU FOR YOUR ATTENTION!