Yamasaki Y30 Series User Manual page 22

Lock Cursors A&B:
Select it to lock the distance between cursors A&B. After that, to move any cursor is to move
the other together, with the distance between them keeping unchanged. Otherwise, when
one of the cursors is moved, the other one will not move.
High resolution test:
Select it to rise the sampling points of the instrument to 256k, improving the resolution
capability on short-distance events occurred on the optical fiber link under test.
5.4 Event analysis and pass-through threshold
The event analysis and pass-through threshold can be set on the OTDR test condition setting
interface.
Loss analysis threshold: If the connection loss of the event point calculated is bigger than the
loss analysis threshold during test curve data analysis, such event point will be marked;
otherwise, it will be omitted.
The fusion loss pass-through threshold: If the connection loss of the event point calculated is
bigger than the fusion loss pass-through threshold set in the event list, the connection loss
shall be marked with "*".
The reflection loss pass-through threshold: If the reflection loss of the event point calculated is
bigger than the reflection loss pass-through threshold set in the event list, the reflection loss
shall be marked with "*".
Optical fiber breakpoint threshold: If the connection loss of the event point is bigger than the
optical fiber breakpoint threshold set, it is deemed to be the optical fiber breakpoint, and all
events after such point will be omitted and not be displayed in the list.
5.5 General failure and solutions
Possible faults of the instrument and solutions are shown below:
Failure Cause
The instrument The battery is dead.
cannot be
External power supply is not
started up.
connected.
No response Check whether any key is kept
from the key being pressed.
Inaccurate a. Improper setting of the optical
length of the fiber refractive index
optical fiber
b. Improper setting of the optical
being measured
fiber correction factor
Inaccurate a. Too big length error of the
Table 3-1 General failure and debugging method
Solution
Charge the battery.
Supply power via AC/DC adapter.
Ensure no keys are kept being pressed.
a. Set the optical fiber refractive index to
the nominal one provided by the optical
fiber manufacturer.
b. Set the optical fiber correction factor to
1.0000 or the nominal one provided by the
optical cable manufacturer.
a. Refer to the previous item to measure the
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