Time
Domain Reflectometry (TDR)
•TDR
is a application of pulse
technique and
it is a echo
technique.
•In
this technique we observe and analyses
the reflected waveform in both electrical and optical media.
•TDR
is useful in both electrical
systems and telecom interconnections.
•TDR
is divided into two types one
is metallic time domain reflectometer and second
is optical time domain reflectometer.
•TDR
is use with high
speed oscilloscope and step generator.
•TDR
is use for finding discontinuity of a transmission line.
•TDR
technique is also useful in testing interconnected paths in printed
circuit board (PCB).
•TDR
also shows the losses in the transmission line are series losses or shunt losses.
•This method is use when system is not in working condition.
•The
step generator send the positive incident wave If the load impedance is equal to characteristics impedance of
line then no
wave will be reflected.
•The
step generator send the positive incident wave If the load impedance is not equal to characteristics impedance of line then the wave will be reflected and which is observe in
oscilloscope.
•From
this we can also determine the
length of the transmission line.
•This is easy and inexpensive technique.
