If Loss Is Negative - Fluke MultiFiber Pro User Manual

• OTHER: The connections use the Corning Plug &
Play ™ Universal Systems method of polarity
management. See Figure B-16 on page 59.
• If POLARITY does not show, one or more fibers are
not connected or SCAN ALL is off on the source.
D
Press SAVE to save the measurements.
SAVE does not show if the source is set to 2 kHz
mode or if the wavelength setting on the meter is
not the wavelength you used to set the reference.
E
CHANNEL: Press CHANNEL to see the measurement
from the next channel.
F
The loss measurement in decibels (dB).

If loss is negative,

flashes and the meter shows
the measurement for the channel that has the
largest negative loss. See "If Loss is Negative" on
page 25.
G
The numbers for the channels flash in sequence when
the meter measures loss.
H
The wavelength of optical signal the meter measures.
Note
Note
I
AUTO shows when the source transmits a wavelength
identifier, and the meter changes its wavelength setting
to agree with the source. See "Auto Wavelength
Function" on page 13.
If Loss is Negative
A negative loss measurement occurs when the measured
power level is more than the reference power level. If the
loss is negative by more than -0.09 dB,
measurement flash on the meter.
Negative loss can be caused by the following:
•
The fiber ends were dirty when you set the reference.
•
The patch cord connected to the source was
disconnected after you set the reference.
•
There was a kink in a test reference cord when you set
the reference.
•
The connectors were not properly aligned when you set
the reference.
•
The meter and source were not set to the same
wavelengths when you set the reference or measured
loss.
How to Measure Loss
and the
25