Mts Axial Extensometers Manuale Utente

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Technical Support10

Preface11PrefaceBefore You BeginSafety first!Before you attempt to use your MTS product or system, read and understand the Safety manual and any other

Preface12ConventionsDocumentation ConventionsThe following paragraphs describe some of the conventions that are used in your MTS manuals.Hazard conven

Preface13Note Resources that are put back on the hardware lists show up at the end of the list.Special termsThe first occurrence of special terms is s

Preface14

Introduction15IntroductionThis manual describes the MTS axial extensometer family. Axial extensometers measure changes along the length of a specimen.

Introduction16What you need to knowThis manual assumes that you know how to use your system controller. See the appropriate manual for information abo

Introduction17Axial Extensometer Functional DescriptionAn axial extensometer is a sensor attached to a specimen that measures a dimensional change (ga

Introduction18About Wheatstone BridgeThe axial transducer uses precision, resistance-type, foil strain gages bonded to a metallic element to form a Wh

Introduction19Transducer CalibrationThe DC conditioner and the transducer signal must be calibrated. Calibration ensures that the transducer signal ac

Copyright information© 1999, 2000, 2005, 2008, 2009 MTS Systems Corporation. All rights reserved.Trademark informationMTS, TestStar, and TestWare are

Introduction20Extensometer Zero ReferenceThere are three zero reference methods used by MTS’s extensometers: zero pin, zero stop, and fixture. The zer

Introduction21• A variety of knife edges allow the extensometer to be used with different specimen shapes:– Straight knife edge sets for round specime

Introduction22

Configuration23Configuration This section describes how to configure an axial extensometer with quick attachment springs, elastic bands, or metal exte

Configuration24Excessive torque on the extensometer arms can damage the extensometer.The extensometer arms can be damaged when mishandled.Do not hold

Configuration251. Check your installation drawing. If your extensometer needs an attachment adapter, perform the appropriate procedure before proceedi

Configuration262. Using a small adjustable wrench, grasp the sides of the upper arm.3. Loosen the socket head cap screws with a hex wrench. 4. Repeat

Configuration27Slide Spring Components1. Zero the arms of the extensometer. Depending on the extensometer, this can be accomplished using the zero pin

Configuration2810. Place one edge of a machinist’s square against the front edge of the top extensometer arm. Adjust the attachment adapter until the

Configuration29.14. While securely holding the attachment adapter, fully tighten the socket head cap screws in that arm of the extensometer with a hex

Contents3Technical Support 5How to Get Technical Support 5Before You Contact MTS 6If You Contact MTS by Phone 7Problem Submittal Form in MTS Manuals 9

Configuration30How to Install Extension Springs or Elastic Bands Installing the extension spring or elastic band attachment system involves replacing

Configuration31To install the attachment hooks:1. Zero the arms of the extensometer. Depending on the extensometer, this can be accomplished using the

Configuration328. Loosely attach the upper knife edge hold-down to the upper extensometer arm using the two socket head cap screws removed in Step 5.

Configuration33Knife edges are available in the standard size, in a heavy duty size, and in an extended length size. The heavy duty and extended lengt

Configuration343. While securely holding the extensometer arm or attachment adapter, loosen the socket head cap screws with a hex wrench just enough t

Configuration358. If necessary, use a small adjustable wrench to grasp the sides of one extensometer arm or attachment adapter (see the figure in Step

Configuration36The following procedure describes a typical gage length extender installation. Actual installation may vary, see the installation drawi

Configuration37How to Use Gage Length De-ExtendersGage length de-extenders let you change where the extensometer contacts the specimen. The following

Configuration38How to Connect the Cable The extensometer cable connects to the system controller via an extension cable. The extensometer has a small

Configuration392. Connect the connector, attached to the cable extending from the extensometer, to the mating connector on the appropriate system cabl

4Configuration 23About Quick Attachment Spring Installation 23How to Install Anchored Springs 24How to Install an Attachment Adapter 25How to Install

Configuration40

Calibration41Calibration This section describes how to calibrate an axial extensometer with a controller. Calibration ensures that the output from the

Calibration42the full travel range of the transducer. (Full-scale ranges of 5% may be possible, but some increase in drift and noise will result.) In

Calibration43and calculate the new conditioner output value for the displacement. For example, suppose the calibration block is set for 7.94 mm. Then

Calibration44D. Prepare to use the calibration controls on your controller.E. Adjust the excitation control to set the excitation to +6 V DC or the vo

Calibration45C. Adjust the gain control to set the extensometer signal to -8 V DC (or 80% of your calculated output).4. Readjust the zero and compress

Calibration46• If the extensometer signal is below +8 V DC (or your calculated output), the ΔK adjustment cannot be made. Return the ΔK adjustment to

Calibration47A. Remove the zero pin, fixture, or release the zero stop and install the extensometer on the calibration block so that the extensometer

Calibration48.A. Connect the extensometer to your controller. B. Monitor the excitation voltage.C. Monitor the extensometer signal.D. Mount the extens

Calibration493. Adjust compression.A. Remove the zero pin, fixture, or release the zero stop.B. Adjust the calibrator between zero and 100% compressio

Technical Support5Technical SupportHow to Get Technical SupportStart with your manualsThe manuals supplied by MTS provide most of the information you

Calibration50

Installation51InstallationThis section describes how to mount the extensometer to a specimen and zero the extensometer output. ContentsHow to Mount an

Installation52See your controller manual for information on establishing the extensometer zero output signal. The electrical output of the extensomete

Installation531. Zero the arms of the extensometer. Depending on the extensometer, this can be accomplished using the zero pin, stop block, or a speci

Installation54out of the attachment adapter or by anchoring the spring in a different hole on the attachment adapter. Note If the specimen dimension i

Installation551. The arms of the extensometer must be in the zero reference position. Depending on the extensometer, this can be accomplished using th

Installation566. Ensure that the plane of the spring end is perpendicular to the side of the extensometer.7. While securely holding the attachment ada

Installation572. Mount one spring in the appropriate hole in the attachment adapter as determined by the specimen dimensions (see the installation dra

Installation58Flat specimensAn extensometer can be mounted to a flat specimen with extension springs using a disk or wireform attachment. When using a

Installation59SPECIMEN DIAMETERMM (IN)SPRING FREE LENGTH MM (IN)12.7 (0.50)15.9 (0.62)19.0 (0.75)22.2 (0.87)25.4 (1.00)28.6 (1.12)31.8 (1.25)34.9 (1.3

Technical Support6Before You Contact MTSMTS can help you more efficiently if you have the following information available when you contact us for supp

Installation60About Elastic BandsElastic bands are commonly used for testing at near room temperature. The contact force may be varied by the cross-se

Installation61Contact forceDetermining the specimen contact force when using elastic bands is difficult.• Greater contact force will provide a more se

Installation62

mMTS Systems Corporation 14000 Technology Drive Eden Prairie, Minnesota 55344-2290 USA Toll Free Phone: 800-328-2255 (within the U.S. or Canada) Phone

Technical Support7Know relevant computer informationIf you are experiencing a computer problem, have the following information available:• Manufacture

Technical Support8Identify system typeTo assist the Call Center agent with connecting you to the most qualified technical support specialist available

Technical Support9Problem Submittal Form in MTS ManualsUse the Problem Submittal Form to communicate problems you are experiencing with your MTS softw