Optical Backscatter Reflectometer 4600 207
User Guide
Cause(s) Solution(s)
Mechanical vibration. Move, remove, or shut down any sources of vibration
such as fans or other motor-driven equipment. Isolate
the OBR from those sources.
Loose DUT connection. Tighten the DUT (device under test) connections.
Dirty DUT or bulkhead
connections.
Clean all connections. For instructions, see “Cleaning
Connectors” on page 195.
OBR not aligned. Realign, then recalibrate. For instructions, see “Aligning
the OBR Optics” on page 34, and “Calibrating the
System” on page 35.
OBR will not scan
Cause(s) Solution(s)
Laser not on or ready. If the laser is not on, turn it on. Then re-scan after the
Laser Ready light comes on. If the laser is on but the
ready light is not lit, the laser is still warming up. Wait
until the Laser Ready light comes on, then scan.
If the Laser Ready indicator does not light within several
minutes of turning on the instrument, see “Laser Ready
light does not come on within several minutes” on
page 205.
The instrument is not
calibrated. (The “Out of
Calibration” indicator should be
lit in this case.)
Recalibrate. For instructions, see “Calibrating the
System” on page 35
Optics not aligned. (The
“Out
of
Alignment” indicator should be
lit in this case.)
Realign, then recalibrate. See “Aligning the OBR Optics”
on page 34, and “Calibrating the System” on page 35.
The instrument is not properly
connected to the PC.
Ensure that the cable connecting the instrument to the
PC is securely attached.
Excessive noise in data
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