SSTDR
Internal SSTDR Technology
Some models of IFD™ TE has a built-in SSTDR provided under licence by LiveWire Innovation.
Specifications:
Ø Distance to Fault Accuracy:
-
+/- 1.0%, controlled impedance cable
-
+/- 2.0%, uncontrolled impedance cable
Ø Output Signal Amplitude: 0.016– 1.0 V peak-to-peak, adjustable
Ø Maximum Distance Ratings:
-
Electrical Cable - 1,828m (6,000ft)
-
Data Cable - 914m (3,000ft)
-
Coaxial Cable - 914m (3,000ft)
-
Power Distribution Cable - 3048m (10,000ft)
Ø SSTDR Frequencies:
SSTDR Frequencies need to applied to the cable under test based
on the guidance provided in the table below.
|
Freq
|
Cable Length (approx values)
|
|
24 MHz
|
Recommended for impedance controlled cables
|
|
12 MHz
|
Recommended frequency for cables up to 90m (300ft)
|
|
6 MHz
|
Use on cables up to 250m (800 ft) in length
|
|
3 MHz
|
Use on cables up to 400m (1,200 ft) in length
|
|
1.5 MHz
|
Use on cables up to 1km (2,000 ft) in length
|
|
750 kHz
|
Use on cables up to 1.25km (4,000 ft) in length
|
|
375 kHz
|
Use on cables up to 2.5km (8,000 ft) in length
|
|
187.5 kHz
|
Use on cables up to 5km (16,000 ft) in length
|
IFD™ Technology is limited to frequencies 12Mhz or less
Also the values listed need to factored by approximately 25% if the SSTDR is used through the IFD™ hardware.
For more information on incorporating this instrumentation in to your IFD™ TE, then contact your Authorised Distribution.
To avoid possible damage to the IFD™ TE
or the equipment under test, follow these guidelines:
· Do not use this equipment on any “powered” circuits. The IFD™ TE supplies the entire electronic testing stimulus needed. Failure to do so could damage the equipment and void the factory warranty.
· Do not connect the IFD™ TE system to any additional test equipment that produces stimulated High Voltages or Currents that might damage the IFD™ hardware, and this will include insulation tests and it may include some Diode testing; if unsure then contact your Distributor for more information before proceeding.