User Manual

Memory Functions
31
If Loss is Negative
A negative loss measurement means the reference power
level is less than the measured power level. This can be
caused by the following:
• The fiber ends were dirty during referencing.
• The connections to the source were disturbed after
referencing.
• The was a kink in a test reference cord during
referencing.
• The connectors were not properly aligned during
referencing.
• The meter and source were not set to the same
wavelengths during referencing or testing.
• The testers were much colder during referencing than
during testing.
• You did not allow enough time for the source to warm
up before setting the reference.
• You measured loss on a fiber that is shorter than the test
reference cord used to set the reference.
If loss is negative, set the reference again and retest the link.
Memory Functions
The meter stores up to 1000 loss or power records. If memory
is full, the meter shows when you try to save a
measurement.
Viewing and Deleting Records
To view records, press M until VIEW RECORD appears. See
Figure 13.