User Manual

Measuring Loss

The loss measurement shows how much optical power is lost

in a link’s fiber and connectors.

About 1 Jumper Connections

The reference and test connections shown in this section

produce 1 Jumper results. 1 Jumper results include the loss of

the fiber plus the loss of the connections at both ends of the

link. This is the most commonly used method for testing

installed fiber links. Other methods are shown in Appendix

1 Jumper connections require connector adapters that match

the connectors in the link under test. If you do not have the

correct connector adapters, see Appendix D for alternative

connections that produce 1 Jumper results.

Testing the Test Reference Cords

You must test your test reference cords at regular intervals.

Use the procedure given in Appendix A.

About Referencing

The reference serves as the baseline power level for loss

measurements. Regular referencing helps account for minor

variations in source power and connection integrity. Also,

since the reference is the baseline for measurements, the

losses of the test reference cords and adapters used for

referencing are excluded from test results.

For the most accurate test results, you should set the

reference at these times:

•

At the beginning of each day.

•

Anytime you reconnect a test reference cord to the

source.

•

Anytime you see a negative loss measurement.

Setting the Reference

You may set the reference from power or loss mode. Fluke

Networks recommends using power mode because the

meter shows the actual power level produced by the source.

In loss mode, the meter shows the difference between the

power level and the previous reference level.