Reference –
195
Problem
Solution
12
The noise seen on a trace,
with only a fiber jumper, is
greater than ±0.02 dB.
Verify the noise level:
•
Perform a zero loss reference.
•
Repeat the measurement in insertion loss mode.
•
Clean all connectors and repeat the measurement.
•
Change jumpers and try again.
Verify power to the DUT:
•
Measure the power at the DUT with a power meter.
The correct power level is >-15 dBm without a
polarization controller and >-20 dBm with one.
If the power is within this specification, but the noise
persists, call the local JDS representative or the
service hotline.
Verify power to the control module:
•
If the power to the DUT is less than expected,
measure the power going into the control module.
Power is ~-11 dBm without a polarization controller
or -14 dBm with a polarization controller.
•
If power to the DUT is within specifications, power
is being lost in the control module.
If power is lost in the control module, clean the UCAs
on the control module:
•
Remove the UCA connectors on the CM.
•
Clean the connectors and exposed ferrules
thoroughly,
•
Re-install the UCAs.
•
Perform a reference.
•
Acquire a trace.
A persistent problem indicates that one of the UCAs is
damaged. Verify the power at the UCA on the control
module:
•
Measure the loss through each UCA. A small loss,
such as ~0.02 dB, is acceptable.
•
If the loss is larger, replace the UCA and try again.
(table continued)
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