Extech Instruments FO600 Manual

A SERVICE OF

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4-7

Extech Reporter

UNIT 4

Light Source Reference Power

Definition: the amount of absolute optical power being received directly from the light source by the

power meter during the setting of the optical reference. Light Source Reference Power is used as a

reference, or starting point, on which a standards-based optical reference is set.

Units: dBm

Calculation: none; Light Source Reference Power is measured via a single patch cord of the appropriate

type.

NOTE: testing standards require multimode reference

cables to be wrapped around a device called a mandrel,

which is used to filter high-order modes and achieve EMD,

or Equilibrium Mode Distribution (shown here).

Singlemode test jumpers do NOT require this mandrel.

Light

Source

Reference

Power (dBm)

INVALID

OPERATING

MARGIN **

Minimum

Required

Power (dBm)

Measured

Power (dBm)

PASS

OPERATING MARGIN

or

SYSTEM OVERHEAD

Optical Loss

FAIL

Total Allowable System Loss

Interpreting Extech Reporter Screens and Reports, cont.

CHARGER

850nm 1300nm

MULTI MODE

LIGHT SOURCE

DualDual

LEDLED