User guide

OMNIScanner User Guide

7 - 2

The Reference Methods

The diagrams show how to establish references with duplex launch cables.

Each method will produce slightly different results.

It is very important that the transmitter connections are not disturbed after

the reference value is established. To assure that the effects of the connec-

tors and launch cables are “zeroed out”, follow the instructions closely.

Note: When a connector is removed and then reattached, it is unlikely to go

back into the exact same position. As a result, measurements will change

when connections are made or broken.

OMNI

Scanner

measures two fibers at the same time in a duplex link. Two

reference values will be stored, one from OMNI

Scanner

to OMNI

Remote

(TX

- RX), the other from OMNI

Remote

to OMNI

Scanner

(TX - RX).

Method A

When Method A is used, the effects of the two launch cables and the

couplers are canceled for all subsequent measurements.

1. Connect a Launch Cable to the fiber adapter that is attached to OMNI-

Scanner. The black fiber attaches to the TX (transmitter) side and the

white fiber to the RX (receiver) side.

2. Connect a Launch Cable to the fiber adapter that is attached to OMNI-

Remote. Now the black fiber attaches to the RX (receiver) side and the

white fiber to the TX (transmitter) side.

3. Use a Coupler to connect the two black fiber ends.

4. Use a Coupler to connect the two white fiber ends.

5. Set the Reference.

850 nm

1300/1310 nm

850 nm

1300/1310 nm

2 m Launch Cable

Coupler

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