EXFO MaxTester MAX-610 - Manual (Page 209)

MaxTester Copper Test 201
11 TDR
The TDR test first attempts to find the length of the circuit and then
searches all ranges from shortest to longest for significant events. Upon
completion, the test selects the nearest major event, sets the range to
match, and aligns the cursor with the event. TDR can see events as close as
the ends of the test leads.
Continuous
The Continuous function displays the line trace and is continuously on and
ready to use. It displays and updates results in real time, in either Portrait
or Landscape Mode, until you stop the test. The last valid results then
remain displayed.

Current Test displays the test being measured.

Range allows you to set the range from the
given list.

Gain allows you select the gain test parameter
from the given list.
The previous 2 parameters have 2 modes of
operation:

Auto is the default mode upon loading the
test page. TDR automatically optimizes the
test parameters and scans each band
individually looking for one Largest Event
in each band (if any). Range and Gain are
updated to reflect optimized TDR settings. Once results are
displayed, TDR switches to manual mode. The test keeps running
until you press Start/Stop on the keypad.

Manual mode allows you set the test parameters to be used as
inputs for the TDR measurements.
Note: If either of the above 2 test parameters are set to Auto, respective
parameter values will be updated by TDR test.