
Chapter 5
Launching a reflectometry test and displaying results
Performing OTDR acquisitions
38
User Manual
770000102/08
Performing OTDR acquisitions
Performing an
acquisition in
Real Time mode
Principle of the
Real time mode
Acquisition in real time must not be used if a precise measurement is
required because of the high noise level, but it is sufficient for rapid opti-
mization of a connection and for observing a fiber in process of utilization.
Performing
acquisition in Real
Time
To carry out an acquisition in real time:
1
Hold the
S
TART
/S
TOP
key down for about three seconds, to launch
the acquisition in real time
or
If the
Time
parameter is defined with
Real Time
in
Setup
page in
OTDR Expert mode, press
S
TART
/S
TOP
hard key.
The red
Testing
indicator will go on to show that real time acquisi-
tion is in progress. The trace acquired is displayed in real time.
An indicator of the state of the connection (
Good/Bad
) is displayed
below the trace:
If the state of the connection is bad, it is still possible to carry out a
measurement, but the results will not be very reliable.
Table 6
Connection indicator
State
Connection
Good
The connection is OK
Bad
– There are several connectors close to the external connector of the MTS/T-BERD.
– One of the connectors is dirty or badly connected. Replace the launch cable, make
the connection again properly or clean the connector of the OTDR or of the jumper.
– No fiber is connected.
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