Copyright 2008-2013 Kenneth M. Chipps Ph.D. www.chipps.com - PowerPoint Presentation

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Copyright 2008-2013 Kenneth M. Chipps Ph.D. www.chipps.com - PPT Presentation

How to Use a Fluke DTX Cable Tester Last Update 20130804 210 1 Objectives Learn how to use a Fluke DTX cable tester Copyright 20082013 Kenneth M Chipps PhD wwwchippscom 2 What is a Fluke DTX Test Unit ID: 286466

copyright chipps www kenneth chipps copyright kenneth www 2013 2008 cable test fiber loss connector reference set testing level

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Slide1

How to Use a Fluke DTX Cable Tester

Last Update 2013.08.042.1.0

1Slide2

ObjectivesLearn how to use a Fluke DTX cable tester

2Slide3

What is a Fluke DTX Test UnitThe Fluke DTX test unit is used to ensure copper and fiber optic cable and connections have been installed to the category or test level required for an installation

3Slide4

UsesThis tester can be used to testCopper CableUTPCoaxialFiber Optic CableSinglemodeMultimode

4Slide5

Tests That Can Be DoneA cable test regardless of the type of cable requires a test device on each endFor copper cable using this unit that isDTX CableAnalyzerDTX SmartRemote

5Slide6

Tests That Can Be DoneFor fiber optic cable using this unit that isDTX CableAnalyzer with the Fiber Module attachedDTX SmartRemote with the Fiber Module attachedorDTX CableAnalyzer with the Fiber Module attachedSimpliFiber light sourceCopyright 2008-2013 Kenneth M. Chipps Ph.D. www.chipps.com6Slide7

DTX CableAnalyzer

8Slide9

Test Unit SetupRegardless of the cable being tested the device must first be configuredThis involvesTelling the units what type of cable they will be testingSetting the reference levelThe procedure for both copper and fiber optic cable will be discussed, beginning with copper UTP cable

9Slide10

Setup for Copper TestingConnect the two units to each other as shown here

10Slide11

Setup for Copper Testing

11Slide12

Setup for Copper TestingTo setup the CableAnalyzer to test UTP cable to a category’s requirements do the followingTurn the unit’s selector toSetupOn the screen selectTwisted PairTest LimitWhatever test limit you are testingCopyright 2008-2013 Kenneth M. Chipps Ph.D. www.chipps.com12Slide13

Setup for Copper TestingCable TypeUTPWhatever cable type you are testingOutlet ConfigurationWhatever outlet configuration you are testing

13Slide14

Set the Reference LevelBefore testing copper cable the reference level should be set between the two CableAnalyzer and the SmartRemoteThis sets a zero point to test fromFirst connect the two units to each other as shown belowTurn on both unitsTurn the rotary switch to Special Functions

14Slide15

Set the Reference LevelSelect Set ReferencePress EnterPress Test

15Slide16

Running the TestAttach adapters appropriate for the job to the tester and the smart remoteTurn the rotary switch to AutoTest and turn on the smart remoteConnect to the installed cabling, as shown below depending on whether this is a permanent link or a channel

16Slide17

Running the TestPress TestTo stop the test at any time, press ExitThe tester shows the AutoTest Summary screen when the test is completeTo view results for a specific parameter, use the Up and Down Arrow buttons to highlight the parameter, and then press Enter

17Slide18

Running the TestIf the AutoTest failed, press F1 Fault Info for possible causes of the failure

18Slide19

Permanent Link

19Slide20

Channel

20Slide21

UTP Test Results

21Slide22

Failed UTP Test Results

22Slide23

Testing Fiber Optic CableTo test fiber optic cable a module is added to the CableAnalyzer and the SmartRemoteThese two units when used together constitute an OLTS – Optical Loss Test SetorThe unit at the remote end can be a SimpliFiber light source

23Slide24

Fiber ModuleThe fiber module is used to allow the DTX to test fiber optic cableThis is attached to the back of the main and remote units

24Slide25

Fiber Module

25Slide26

SimpliFiberIn place of the fiber optic cable module attached to the SmartRemote of the DTX system a SimpliFiber end unit can be usedIt looks like thisCopyright 2008-2013 Kenneth M. Chipps Ph.D. www.chipps.com26Slide27

Fiber TestingThe fiber test example presented here is the test used for multimode cable as it is commonly used as a backbone cable inside of a buildingThis is a simple insertion loss testThe purpose of this test is to determine if any damage occurred during installation or termination

28Slide29

Fiber TestingFor example, the cable itself may have micro or macro bends that will cause excessive lossA connector may not have been properly installedThe cable end faces may be too dirty

29Slide30

Steps in Fiber TestingTo perform a fiber optic multimode cable testCompute the allowable lossSetup the display unitSetup the remote light source unitClean the connectionsSet the reference levelPerform the test

30Slide31

Compute the Allowable LossIn most cases the expected loss must be calculated based on the number of connectors, splices, and length of the installed cable, then compared to the actual loss for a pass or fail of the linkThe DTX CableAnalyzer will do this for you

31Slide32

Compute the Allowable LossEven though it is calculated for us with these units let’s compute the expected loss just to see how it is done

32Slide33

Compute the Allowable LossIn this example, which is typical for a multimode fiber backbone cable we haveLength of cable150 feetAt 0.001067 dB of loss per footConnectorsOne at each end using no polish connectorsAt 0.75 dB of loss per no polish connector

33Slide34

Compute Allowable LossFor this example of 150 feet of cable with a connector at each end(0.001067 X 150) + 0.75 + 0.751.66 dB of loss in a perfect installationOf course this number will vary depending on the characteristics of the actual installation in the fieldThese values for connector loss are also way to high

34Slide35

Compute Allowable LossAs most connectors these days have a typical loss of .1 dB and a maximum loss of .5 dB this allowable loss is going to be way highStill .75 is considered to be the standard loss number used for these types of calculationsIt provides an extra margin as wellCopyright 2008-2013 Kenneth M. Chipps Ph.D. www.chipps.com35Slide36

Compute Allowable LossIf you wish to take the belt and suspenders approach you may add the commonly used fudge factor of 3 dB to the computed number to be sure the connection will still work as things deteriorate over time from slight damage and dirty connectionsThis would make the number to enter 4.66 in this example

36Slide37

Compute Allowable LossShown next are tables where the basic numbers are computed for common distances in feet for the two multimode test wavelengthsIn our case the cable length is 150 feetThe value in the table for 100 feet is 1.6067The value for 200 feet is 1.7134

37Slide38

Compute Allowable Loss

39Slide40

Compute Allowable Loss

40Slide41

Setting the Fiber Test SettingsThe next step is to setup the test units to do the type of test we want to do

41Slide42

Setting the Fiber Test SettingsTurn on both unitsOn the CableAnalyzer turn the unit’s selector toSetup

42Slide43

Setting the Fiber Test SettingsOn the screen selectFiber LossTest LimitSelect or setup the test limit for the link to be testedFiber TypeSelect the type of fiber being testedMultimode 62.5 in this exampleCopyright 2008-2013 Kenneth M. Chipps Ph.D. www.chipps.com43Slide44

Setting the Fiber Test SettingsRemote End SetupSmart Remote for the DTX SmartRemoteorFar End Source for the SimpliFiber unitBi-DirectionalNo

44Slide45

Cleaning Fiber Before TestingFiber connectors need to be clean before testingTo clean use 98% pure isopropyl alcohol or fiber cleaning fluid and optical grade wipes and swabs

45Slide46

Cleaning Fiber Before TestingTo clean a connector in a patch panelPlace a drop of cleaning solution on a fiber wipeFirmly touch the tip of a fiber optic cable cleaning swab to the damp spot to transfer the cleaning solution to the swabInsert the swab firmly against the end face inside the connectorPushing against the connector end face twist the swab round about 3 timesCopyright 2008-2013 Kenneth M. Chipps Ph.D. www.chipps.com46Slide47

Cleaning Fiber Before TestingTo clean a connector on a cablePlace a drop of cleaning solution on a fiber wipeWipe the tip of the connector to the damp spotWipe the tip with a dry fiber wipe to remove any excess cleaning fluid

48Slide49

Set the Reference LevelAn accurate reference level must be set before any measurements are made in order for the CableAnalyzer to determine if the link passes or failsIt determines this by using the setup information to extract and use stored values for the characteristics selected during setupLet’s set the reference level

49Slide50

Set the Reference LevelTurn off both the DTX CableAnalyzer unitsSetting the reference level requires two equal length patch cables with a connector at each endOne should be marked as cable 1 and the other as cable 2

50Slide51

Set the Reference Level

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Set the Reference LevelConnect the black connector on either end of the patch cord labeled 1 to the input port on the CableAnalyzerLeave the red end of this end of the cable loose

52Slide53

Set the Reference LevelConnect the red connector at the other end of the patch cable labeled 1 to the output port of the remote unitLeave the black connector of this end of the connector loose

53Slide54

Set the Reference LevelConnect the red connector on either end of the patch cord labeled 2 to the output port on the CableAnalyzerLeave the black end of this end of the cable loose

54Slide55

Set the Reference LevelConnect the black connector at the other end of the patch cable labeled 2 to the input port of the remote unitLeave the red connector of this end of the connector loose

55Slide56

Set the Reference LevelIf this is all done correctly the units will chirp

56Slide57

Set the Reference LevelOn the CableAnalyzer turn the unit’s selector toSpecial FunctionsOn the screen selectSet ReferenceThe Set Reference screen is displayed

57Slide58

Set the Reference LevelThis screen shows a reference diagramVerify that the diagram matches your setupPress TestAfter the testPress F2

58Slide59

Set the Reference LevelOnce the reference is set do not unplug the cable from either output portOtherwise the reference will need to be reset

59Slide60

Test the LinkRemove the inputs on each endFor cable 2 which is attached to the CableAnalyzer hook the black connector of the end of the cable where the red connector is already attached to the unit to the input port

60Slide61

Test the LinkFor cable 1 which is attached to the remote unit hook the black connector of the end of the cable where the red connector is already attached to the unit to the input port

61Slide62

Test the LinkConnect cable 1 to cable 2 by using a dual sided connector to attach the remaining connectors this wayCable 1 red to one end of the cable to be tested red connectorCable 1 black to one end of the cable to be tested black connector

62Slide63

Test the LinkFor cable 2 which is attached to the CableAnalyzer hook the black connector of the end of the cable where the red connector is already attached to the unit to the input port

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Test the LinkConnect cable 1 to cable 2 by using a dual sided connector to attach the remaining connectors this wayCable 2 red to one end of the cable to be tested black connectorCable 2 black to one end of the cable to be tested red connector

64Slide65

Test the LinkThe unit should chirp

65Slide66

Using MandrelsThere is a lot of back and forth about the need to use mandrels when testing fiber optic cableAs the cost of these is so small and the attachment of them to the patch cables is so easy, I fail to see why so much discussion revolves around this topicHere is some of that discussion

66Slide67

Using MandrelsThe reason the instructions call for this is if an LED light source is used at the far end of the link, then a mandrel should be usedThe mandrel acts as a mode filter to remove the unwanted high order modes from the light sourceThis occurs as the less accurate LED overfills the fiber

67Slide68

Using Mandrels

68Slide69

Using MandrelsMandrel wrapping is a technique used to create a defined mode power distributionIf the launch optical fiber is fully filled ahead of the mandrel wrap, the higher order modes will be stripped off, leaving only the lower order modesThis is required for the meter attached to the other end to properly measure the light received

70Slide71

Using Mandrels

71Slide72

Wrapping MandrelsA patch cord is wrapped around the mandrel as show next

72Slide73

Wrapping Mandrels

73Slide74

Using MandrelsMany argue against using these as they say in practice the large limits that are acceptable for these tests are sufficient that a mandrel need not be usedAn article in a 2009 issue of BICSI News explained this very clearlyIt says

74Slide75

Using MandrelsThe use of a mandrel, a smooth rod, is one additional practice specified by TIA standards to achieve the most accurate loss measurements during calibration and testingA multimode launch cord is wrapped five times - nonoverlapping around the mandrel before calibration

75Slide76

Using MandrelsConsistency can be improved by taping the cord around the mandrel and then taping the entire assembly to the source to reduce undesirable movement of the launch cord in relation to the sourceThe diameter of the mandrel is determined by the launch cord core size and construction, as shown in Table 3

76Slide77

Using MandrelsThe purpose of the mandrel in multimode testing is to remove the modes, or pathways, of light near the outer edge of the core, as shown in Figure 3Without a mandrel, these outer modes of light will make it through the short launch cord to the meter during calibration and ultimately be included in the reference measurement

77Slide78

Using MandrelsWhen the link test is performed, the normal bends and connections of an installed link will cause these outer modes to be lost, and using a mandrel gives a more realistic measurement by removing these outer modes before calibrationMost technicians do not use mandrels—in fact, many have never seen one

78Slide79

Using MandrelsHowever, acceptable test results are typically still achieved since the acceptance values specified in the standards are relatively lax as noted previouslyIf unexpected high loss is encountered in an installed link, using a mandrel may resolve that high loss

79Slide80

Warm UpLet the test and remote unit warm up for five minutes before testing a link

80Slide81

Measure the LossTo measure the lossTurn the selector to Auto TestPress TestRead the resultThe unit will report a pass or a fail

81Slide82

Viewing Test Results

82Slide83

Viewing Test Results

83Slide84

Visual Fault LocatorThe CableAnalyzer includes a visual fault locatorThis function is used to check fiber continuity, as well as to find faultsTo use this functionConnect the fiber to the VFL portPress the VFL button next to the connectorLook for a red light from the fiber

84Slide85

Visual Fault Locator