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Section 5
ORL REFERENCE
WRAP MANDREL
14.6 dB REF
[Wrap Mandrel] screen
[Connect 14.6 Ref Cable] screen
One TURBOTEST 500B unit is required to perform an optical return loss test. Fiber optic terminators are
recommended to remove back-reflections when testing fiber link less than 60 kilometers (37.5 miles) in
length. Call Noyes for ordering information. Refer to Appendix A for a chart and graph relating to return
loss of a fiber link with open end vs. terminated end.
Setting References
Use the following procedures to perform an optical return loss reference setup. Setting references is
recommended on a daily basis before testing and when changing test jumper(s). Lasers must be set
to -5 dBm output (refer to section titled “Common Functions: Power Adjustment”, page 19). If lasers
have been adjusted since last referencing, references need to be reset.
Clean all fiber optic connectors and optical ports before performing test procedures described below.
On entry to the [ORL] test mode, the TURBOTEST 500B unit will determine if the reference hasn’t been
set for over 24 hours and prompt you to re-reference.
The display will read:
ORL
TRIPLE nm
REFERENCE IS OVER 1 DAY OLD
SET REFERENCE IS RECOMMENDED
LATER
NOW
• Pressing the [LATER] soft key allows you to omit setting references and use the old reference
values.
• Pressing the [NOW] soft key allows you to access the [ORL REFERENCE] screen and select the
desired option as follows:
Note:
You may also access the [REFERENCES] screen at any time from the [ORL MAIN MENU] screen.
Press the [MENU] key, then choose [REFERENCES] option, and then press the [SELECT] soft key.
Summary of Contents for AFL Telecommunications NOYES TURBOTEST 500B
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