EXFO FOA User Manual

NOTICE

IQS-3250

IQS-3250B

IQS-9403

OHS-1700-UH

This information applies only to the

IQS-3250, IQS-3250B, IQS-9403 and OHS-1700 user

guides.

Improvement for FOAs on EXFO Modules

EXFO has made improvements that will increase the life of the FOA
receptacles for the following instruments:

³ IQS-3250

³ IQS-3250B

³ IQS-9403

³ OHS-1700-UH

The improvement features a longer thread than the one on the older
models. The wear of the threads is decreased significantly as the holding
pressure is now distributed over five threads rather than two.

Note: Even if the number of threads slightly changes the distance from the end

ferrule, it does not have an impact on measurement uncertainty with an
integrating cavity.

Modules with the improvement are identified on their faceplates by the
letters "LT" (Long thread). In the case of the OHS-1700 Optical Head, you
will also notice a small dot next to the port.

P/N: 1057456 November 2009 1/3

The longer threads on the faceplate required the change of four FOA
models, the old FOA-302 (MT Ferrule), FOA-303 (Mini-MT Ferrule), FOA-392
(MTP ferrule) and FOA-393 (MT-RJ ferrule), as they are not compatible with
the new faceplate design. The new FOA design for the new faceplate can
be recognized by the letter "B" added to the model numbers stated above.

Below you can see some examples of the new identification stickers on
the front of the FOAs.

The table below indicates the compatibility for the faceplates and the FOA
models.

Compatibility chart for FOA-302, FOA-303, FOA-392, FOA-393

Faceplate

Old New (LT)

FOA

Old

New (B)

Ye s No

Ye s Ye s

Below you can see the new faceplate with the new FOA. The threads in the
FOA and on the faceplate are fully compatible and the connection is done
properly both sideways and from the front.

P/N: 1057456 November 2009 2/3