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The OTDR Use And Precautions by Fiberstore ning
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The OTDR Use And Precautions |
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Electronics
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OTDR and fiber-optic link, the length of the fiber link loss, splice loss, splice point and the fault location and other information. For general testing, using the the OTDR automatic test function can meet the requirements but they can not place undue reliance on automated testing, automated test may not be able to give satisfactory results in some cases, such as short distance (tens of meters within) determine and locate the event point may not be accurate and ultra-long test, had no event point may be an event point of miscarriage of justice, should have events also may point to the Missing, and sometimes, the same single fiber number of occasions, the test results may be inconsistent, in this case, it is best to use the manual test mode.
The manual test mode requires the operator to select the appropriate test parameters, such as the distance of the fiber under test and the test range, pulse width, attenuation, and the average number of the appropriate test parameters will test the best test results.
Test range, you must pay attention to the selected measuring range is greater than the length of the fiber under test, preferably greater than twice the length of the fiber under test, which is to prevent the impact of the end of the fiber secondary reflection (when the test range of less thanwhen measured twice the length of the fiber, the fiber end of the secondary reflection peak may fall flat curve on the test, commonly referred to as “ghosting” caused by the fiber link has the illusion of the point of failure). This does not mean the test range is less than twice the length of the fiber under test can not test, the first is the “ghosting” depends on the reflection of the end of the fiber strength of, if the reflection is very weak, “ghosting”probability is very small; followed by “ghosting”, how to judge and to avoid, an experienced operator will test range zoom and then test, or the end of the fiber bending look at the reflection peak on the curve disappeared.the instructions in front of the peak reflectivity of the “ghosting”.
Choose the same test pulse width depends on the length of the fiber under test, when the need to test the long-distance fiber-optic, try to use a larger pulse width To test the short-distance optical fiber (such as the distance is less than 1km), then the best choice for the smallestpulse width, spatial resolution, due to the size of the pulse width determines the test in the case of the curve of SNR permission, try to choose a small pulse width will get more accurate results of event points.
OTDR test parameters, as well as the average number of settings, some OTDR set for the average time between the two mean the same, the average processing to try to suppress noise in the curve, the test curve is smoother. The average number of times (or average) should be set as flexibility, in general, the average processing a certain number of times (such as 300 or 3 minutes), the effect is no longer obvious.
In the OTDR use process, pay attention to the maintenance and repair work, do the following:
(1)to maintain the OTDR light output head cleaning; each test to clean the end face of the fiber under test.
(2)OTDR light output head is generally the FC / PC type or FC / the APC type to pay attention to the measured fiber connector types should match with the OTDR light output head.
(3)Try not to real-time test status of the OTDR access to the fiber under test as a result of the actual needs, you can access for some guide fiber (length greater than 500m) after.
(4)To extend battery life in the machine, the best battery is fully charged before storing the instrument storage. When unused for long periods, generally three months or so at least once a charge and discharge.
This information from fiber optic products store: Fiberstore
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OTDR, Fiber Optic,
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