TB 9-6625-2309-24
NOTE
If steps in c below are used to change ZERO-KM SETTING to a
value other than 0, the ZERO-KM SETTING must be returned
to 0 for steps in SECTION III, paragraphs 7 a and b to be
valid. Record value of ZERO-KM SETTING and restore this
value after performing steps in SECTION III, paragraphs 7 a
and b.
c. To change ZERO-KM SETTING perform steps (1) through (10) below:
(1) If Press Any Main Panel Key To Begin screen is displayed press any key,
then press HELP pushbutton or press HELP pushbutton if distance scale is displayed on crt.
(2) Press MORE softkey.
(3) Press INSTRUMENT SETUP softkey.
(4) Press OTDR SETUP softkey.
(5) Press GPIB ADDR/MODE softkey.
(6) Adjust CURSORS B control to display Adjust Zero-KM.
(7) Press Adjust Zero KM softkey.
(8) Adjust CURSORS A control to display desired value (R).
NOTE
A positive number causes trace to move left on display (smaller
measured distances). A negative number causes trace to move
right on display. ZERO-KM SETTING value is displayed in
nanoseconds; 1 nanosecond
0.1 meters. Example: location
off-set for an out-of-tolerance TI is -1.50m on graphic report,
adjusting ZERO-KM SETTING approximately -15 nanoseconds
will be needed to place TI in tolerance.
NOTE
Changing ZERO-KM SETTING only has effect on performance
of presently installed optical module and wavelength which is
selected. Optical module which has ZERO-KM SETTING other
than 0 must remain with TI mainframe for calibration to
remain valid.
(9) Press ACCEPT CHANGES softkey.
(10) To warm boot TI, on keyboard simultaneously press keys Ctrl, Alt, Del.
NOTE
Rebooting TI is necessary for ZERO-KM SETTING to take
effect. Warm boot of TI is necessary to maintain proper sync
established by SECTION III, paragraph 7 b.
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