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4-8
Extech Reporter
UNIT 4
Measured Power
Definition: the amount of absolute optical power being received from the light source by the power meter
after theyhave been connected to the link under test. Measured Power is compared to the System
Reference Power forPass/Fail analysis; if Measured Power is greater than the System Reference Power,
the link passes; likewise if Measured Power is less than the System Reference Power, the link fails.
Units: dBm
Calculation: none
Total Allowable System Loss
Light
Source
Reference
Power (dBm)
INVALID
OPERATING
MARGIN **
Minimum
Required
Power (dBm)
Measured
Power (dBm)
PASS
OPERATING MARGIN
or
SYSTEM OVERHEAD
Optical Loss
FAIL
Patch
Panel
Patch
Panel
Link Under Test
Interpreting Extech Reporter Screens and Reports, cont.
Operating Margin %
(only appears on printed circuit detail reports)
Definition: the difference between the Measured Power and the System Reference Power, also known
as headroom, expressed as a percentage.
Units: percentage (%)
Calculation: none
Total Allowable System Loss
Light
Source
Reference
Power (dBm)
INVALID
OPERATING
MARGIN **
Minimum
Required
Power (dBm)
Measured
Power (dBm)
PASS
Optical Loss
FAIL
OPERATING MARGIN
or
SYSTEM OVERHEAD
CHARGER
850nm 1300nm
MULTI MODE
LIGHT SOURCE
DualDual
LEDLED