IEC 61746 PDF

IEC provides procedures for calibrating multimode optical time domain reflectometers (OTDR). It covers OTDR measurement. Buy IEC CALIBRATION OF OPTICAL TIME-DOMAIN REFLECTOMETERS (OTDR) – PART 2: OTDR FOR MULTIMODE FIBRES from SAI Global. Buy IEC CALIBRATION OF OPTICAL TIME-DOMAIN REFLECTOMETERS (OTDR) – PART 1: OTDR FOR SINGLE MODE FIBRES from SAI Global.

Author: Faetilar Tutaxe
Country: Chile
Language: English (Spanish)
Genre: Technology
Published (Last): 16 October 2008
Pages: 453
PDF File Size: 7.77 Mb
ePub File Size: 4.27 Mb
ISBN: 111-4-70557-263-4
Downloads: 37311
Price: Free* [*Free Regsitration Required]
Uploader: Fegul

The long recovery time from ied overload pulse means the OTDR cannot make any useful measurements near the instrument itself.

We have no amendments or corrections for this standard. I am testing a cable with OTDR. Please first verify your email before subscribing to alerts.

It is important to us that you purchase the right document. From this trace, the OTDR calculates fiber length, attenuation and joint loss. It sends a pulse down the fiber and looks for a return signal from fiber backscatter and reflections from joints, creating a 6746 called a “trace” or “signature” from the measurement of the ice.

If you are using an OTDR without training, you are going to have big problems. If you need help with the purchase or have any queries please email enquiries standards.

New international testing standards, however, accept both OTDR testing and insertion loss testing, even for short premises multimode cable plants. Provides procedures for calibrating single-mode optical time domain reflectometers OTDR. I use bi directional analysis. In the real world, multimode cable plants in premises installations can have losses of dB or more. A receive cable may be used on the far end to allow measurements of the connector on the end of the cable under test also.

I have a limit 0. For a splice with 0. For this reason alone, we recommend that insertion loss testing be done even when OTDR testing is required by installation contracts. Please first log in with a verified email before subscribing to alerts.


The OTDR uses the speed of light in the fiber from the index of refraction to calculate the length of the fiber. Best to make sure the trace is not noisy to the end and have dB from the cable backscatter level to the noise floor. Proceed to Checkout Continue Shopping. If the document is revised or amended, you will be notified by email. There are many times a splice is undetectable in an OTDR trace due to good splices and the simple fact that the OTDR measurement technique itself is limited.

I assume you mean you need to test with a bare fiber on the OPGW. It only covers OTDR measurement errors and uncertainties. You are seeing the directional differences. Already Subscribed to this document.

Most OTDRs also allow setting a threshold for detection of events and that must be set correctly to recognize events. Splice threshold Reflectance threshold Slope threshold slope is attenuation coefficient End threshold depends on whether you 1 use receive reference cable which would be a normal connection loss or 2 the length of the cable and the noise floor of the measurement.

It constitutes a technical revision. Directional Results Can Be Confusing: How can we differentiate a ghost from a real event? 6174 for single mode fibres This document has been re-assessed by the committee, and judged to still be up to date. The large event you see right in front of the instrument on the OTDR trace is caused by crosstalk within the instrument and reflectance from the connector on the face of the OTDR. In a long outside plant cable with many splices, the OTDR is used to ensure that the cable has not been damaged during installation and each splice is properly made.

Some manufacturers of 6176 can provide that information for your testing.


IEC – European Standards

Most of the technical calls we get at FOA regarding eic using OTDRs on premises cabling systems are caused by users who don’t know what an OTDR is requiring them for testing their installation just because somebody told them to or they assume a bigger, more expensive instrument gives better data.

It is designed to cover every economic sector and virtually every activity of the humankind where technical standards may be used. As the voice of the U. A knowledgeable contractor should be able to educate the user on proper testing requirements.

Your Alert Profile lists the documents that will be monitored. Idc a more technical standpoint, the first and most important consideration for OTDR iiec is the length of the fibers to be tested. International Classification for Standards ICS is an international classification system for technical standards.

This standard is also available to be included in Standards Subscriptions.

Calibration of fibre optic measurement instruments | Diamond

First, what are the sources of error? Standards Subsctiption may be the perfect solution. This standard does not cover correction of the OTDR response. The launch cable, sometimes also called a “pulse suppressor,” has two major reasons for its use: Needless to say, it’s extremely important to understand how to use these instruments correctly.

IEC 61746-2:2010

Need more than one copy? Also a short connection cable attached to the OTDR before the launch cable that never gets removed from the OTDR prevents excess wear on the panel connector.

We recommend that you check the website of the publishers of the ie document before making a purchase.