User controls and display
8
The controls of the TDR have been arranged such that
the instrument is easy to learn and use. The instrument
controls consist of the following
Instrument Display: The display shows the user the
current settings of the instrument and the reflected
energy trace from the cable connected.
Tx Null: This rotary control allows the user to
match the internal balance circuit of the TDR to
that of the cable under test. When correctly
adjusted the majority of the displayed
transmitted pulse can be nulled out, allowing
cable features close to the start of the cable to
be identified. Refer to section TX Null for further
details.
Cursor Left: Moves the ‘distance’ cursor to the
left. Auto repeats if held down.
Cursor Right: Moves the ‘distance’ cursor to
the right. Auto repeats if held down
3000m
1780m
75
0.67R
Ω
Transmission
pulse
Range
Distance to cursor
Impedance
Gain
Reflection
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