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Description
The 1205CXB is a Time Domain Reflectometer, also known as a Cable Radar.
Electrical pulses are transmitted into a cable, and a portion of the pulse energy
is reflected back from cable imperfections. These can be discontinuities
(eg cable joints, changes in cable type or the far end of the cable under test)
or faults (typically short circuits, open circuits, high resistance joints or water
ingress).
The transmitted pulse and the reflected pulse(s) are shown on the display.
The time taken by the pulse to travel to the imperfection and back is a measure
of the distance to the fault. The distance is displayed after the cursor is
positioned at the start of the reflected pulse. The type of imperfection can be
assessed by analysing the displayed waveform.
NOTE: The cable must contain at least two conductors or one conductor and
screen. This can be generalized to include other multi-conductor set ups such
as district heating systems.
Velocity of Propagation (VOP)
The properties of the cable, mainly the insulation between the two conductors,
greatly affect the velocity of the TDR pulses. This velocity is called the Velocity
of Propagation (VOP), or Velocity Factor (PVF). The TDR uses this value to
calculate distance, so it is important for this to be as accurate as possible.
The 1205CXB can accept user selectable values between 10.0% and 99.9%.
The "Operation" section shows how you change the VOP to the desired value.
Before you begin
This guide is intended to be a quick reference guide. We recommend you read
the full Operation Manual before you attempt to operate the 1205CXB.
The 1205CXB contains a Lithium-Ion battery. Charge it using the USB cable
and multi-region charger provided and do not exceed the specified maximum
charging current.
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