JDS Uniphase RX3 Series User Manual page 39

26
Connector Loss and Backreflection
Ensure that the loss and backreflection levels of all the connectors are low and stable.
Long Cables
Terminate long cables near the DUTs or connectors being tested to eliminate backreflections
from the fiber.
Laser Stability
If the message INPUT HIGH or INPUT LOW is displayed, lower the hinged door of the output
module, connect one of the internal FC/APC connector to the detector, and press the POWER
key. The reading is expected to be both steady and higher than -10 dBm. If the reading is as
expected, but an error message persists, perform the appropriate procedure recommended in
Table 9.
Calibration
If the backreflection or power calibration was not performed properly, set CALBR to 0 dB and
CALP to 0 dB (see the Calibrating the Meter section) to restore the factory-set calibration. This
should provide reasonably accurate backreflection and power measurements.
Other
A variety of other possible display messages and symbols are described in Table 9.
Table 9: Other Messages and Symbols
Display
*
<
TOO MUCH LIGHT
INPUT LOW
INPUT HIGH
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Problem
The backreflection or
power measurement is
approaching the range
limit of the RX3 meter.
BR range is very limited.
DARK value is too high.
Laser power is too low.
Laser power is too high.
Solution
Follow the setup and measurement
techniques described in the Preparing
the Meter for Backreflection
Measurements and Setting Up the
Meter for Loss and Power
Measurements sections.
Follow the setup and measurement
techniques described in the Preparing
the Meter for Backreflection
Measurements and Setting Up the
Meter for Loss and Power
Measurements sections.
Attach the detector cap to the detector,
and press the DARK key.
Check the measurement setup for an
external source that can have entered
the output.
Check the measurement setup for an
external source that can have entered
the output.
(table continued)