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: Mujind Vudokinos
Country: Fiji
Language: English (Spanish)
Genre: Technology
Published (Last): 15 May 2014
Pages: 352
PDF File Size: 8.27 Mb
ePub File Size: 3.4 Mb
ISBN: 747-4-36131-571-2
Downloads: 73419
Price: Free* [*Free Regsitration Required]
Uploader: Mezikree

The launch cable has also been called a “pulse suppressor” because it allows time for the OTDR to settle down from this initial overload.

Follow these links to find other Standards similar to the one you are viewing. For a splice with 0.

IEC 61746-2:2010

We have no amendments or corrections for this standard. See the demonstration below for a way to prove this to yourself.

Just measure the fiber on the spool of cable with the OTDR, then look at the cable jacket for length markings to get the actual length of the cable from the printed markings at each end of the cable.

The answer to this question has several aspects. It sends a pulse down the fiber and looks for ie return signal from fiber backscatter and reflections from joints, creating ic display called a “trace” or “signature” from the measurement of the fiber. An insertion loss test made with a light source and power meter is a simple test that is similar in principle to how a fiber optic link works.

Some manufacturers of cable can provide that information for your testing. Need more than one copy? If you are using an OTDR without training, you are going to have big problems.


It only covers OTDR measurement errors and uncertainties.

Calibration of fibre optic measurement instruments | Diamond

Have a long pigtail on the OTDR as a launch cable, long enough for the test pulse 6746 settle, say m, then use a splice for a temporary connection. Subscription pricing is determined by: It constitutes a technical revision. Add to Alert PDF. International Classification for Standards ICS is an international classification system for technical standards. 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.

The OTDR uses the speed of light in the fiber from the index of refraction to calculate the length of the fiber.

I have a limit 0. Your Alert Profile lists the documents that will be monitored. Already Subscribed to this document. This standard is not included in any packages.

A light is placed on one end of the cable and a power meter measures loss at the other end, just like a link transmitter and receiver use the fiber for communications. 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.

For this reason alone, we recommend that insertion loss testing be done even when OTDR testing is required by installation contracts. If the document is revised or amended, you will be notified by email.


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.

It is designed to cover every economic sector and virtually every activity of the humankind where technical standards may be used. Premises cabling, however, has short cable runs and almost never includes splices, so kec requirement of OTDR testing appears to be as an alternative to insertion loss testing with a light source and power meter, which in reality, is inappropriate.

Proceed to Checkout Continue Shopping.

IEC 61746-1 Ed. 1.0 en(2009)

Most of the technical calls we get at FOA regarding problems using OTDRs on premises cabling systems are ice 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 only covers OTDR measurement errors and uncertainties. Are there some reusable connectors in the commerce?

We are starting to test some OPGW cables. Later OTDR testing 617466 be used for troubleshooting problems like finding locations of cable breaks caused by dig-ups. I am testing a cable with OTDR. New international testing standards, however, accept both OTDR testing and insertion loss testing, even for short premises multimode cable plants.