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UNPACKING:Carefully unpack and check contents. If any com-ponents are missing or damaged, save the packinglist and material, and advise the carrier and BuehlerLtd. of the discrepancy. For your warranty protectionand our permanent file, please complete and returnthe enclosed Equipment Registration Card.

ASSEMBLY:The MICROMET8 II should be placed in a room thatis clean and has a relatively constant temperature.The location should be free from dust and vibration.It is recommended that the instrument be placed ona rigid wood or steel desk in a controlled laboratoryenvironment.

The MICROMET8 II is shipped assembled except forthe Filar Eyepiece, Micrometer Stage, and Standard Vise.

The Digital Filar Eyepiece is packed in the top of theprotective styrafoam case. The Standard Filar Eye-piece is included in the Black Accessory Case. Removethe Eyepiece from its protective shipping packageand place it in the eyepiece tube. Be sure to check

MICROMEr II

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the lens for dust or debris. The Eyepiece must befully inserted to provide proper magnification andaccurate measurements. The Digital Filar EyepieceCable must be connected to the rear of the instru-ment. When the connector has been attached, securethe Cable to the top of the instrument with theHolding Screw.

The Micrometer Stage is packaged in a white accessorybox with the tester. Using an alien wrench, removethe lock screw and bracket from the stage. Raise thecolumn in the base of the instrument by rotating theElevating Handle on the right side of the instrumentuntil the recessed set screw appears. loosen the setscrew so that the stage can be placed into the column.When the stage has been fully seated in the columnwith the micrometers facing forward and to the right,retighten the set screw to secure the stage in place.

The Standard Vise is included in the Black AccessoryCase and can be attached to the MICROMETe IIstage with four alien screws. It is important that allthe screws be tightened completely to prevent samplemovement during testing.

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PREPARATIONS BEFORE OPERATION:Attach the power cord to the instrument and thento the proper electrical outlet. The voltage require-ments are indicated on the specification plateattached to the rear of the tester.

Before operation, the top cover of the instrumentmust be removed to access the weight loading system.The unit is shipped with the weights secured withfoam pads and card spacers. This packing must beremoved prior to operation. The weight beam issecured by a locking screw that is tagged for easyidentification. Remove this screw and the weightsystem is ready for operation. Check the Dial-A-Weightsystem for proper application by slowly turning theWeight Dial from the heaviest load to the lightestload and back again. When this is done the weightsshould settle one on top of the other within the

weight compartment.

NOTE: Save both the foam pads and the lock screwfor later use in the event the tester must be moved.Shipment of the MICROMEre II without the weightssecured can cause damage to the weight applicationsystem.

Remove the Protective Cap wh ich covers the DiamondIndentor by unscrewing it in a counter clockwisedirection. The Protective Sleeve should be installedaround the Indentor to prevent inadvertent sidewardpressure. The Sleeve is included in the Black AccessoryCase and installs in the same socket which held theProtective Cap.

OPERATION:Place the specimen to be tested in the vise so that thesurface to be tested is perpendicular to the DiamondIndentor. The optional Self Leveling Vise is recom-mended to assure proper alignment. If the samplemoves during the test or if the impression is notuniform due to improper alignment, the test resultsshould be disregarded and the test repeated.

The instrument is turned ON by positioning the ToggleSwitch located on the left side of the instrument tothe up position. When the instrument has been turnedON the red POWER indicator light will illuminate onthe front panel. The tester can be turned OFF bypositioning the Toggle Switch in the down position.

Rotate the Objective-Indentor Turret to the 10X scan-ning objective. The Turret is equipped with click stopsto assist with proper alignment. The specimen can bebrought into focus by the Stage Elevating Handlelocated on the right side of the tester. The IlluminatorI ntensity Control Knob, located on the front panel,can be used to vary the light brightness to operator

preference.

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Select the area of the sample to be tested. Since theMICROMET$ II indentation placement is consistent,the sample can be moved so that the exact point ofimpression can be chosen. The area to be testedshould be placed in the center of the field of view(Figure 1).

Figure 1. TEST AREA

Select the weight for the load application. The Dial-A-Weight Selector Knob is located on the right side ofthe tester. If your tester is a Digital Model it is neces-sary to set the Test Load Knob on the front panel tomatch the Weight Selector Knob. If the Test LoadKnob and the Weight Selector Knob do not agree thetest result will be inaccurate.

Set the load Timer (Figure 2) for the length of timethat the load is to be applied. The load Timer Knobis also on the front panel. It is suggested thatthe timer

Figure 2. FRONT PANELS

be set at 12 to 15 seconds for most applications. It isrecommended, however, that you consult the ASTMstandards for the specific material you are testing.

Rotate the Objective-Indentor Turret to the Indentorand press the START Button. If you have a DigitalModel be sure that the I ndentor Selector Toggle Switchis in the position of the penetrator style that is in thetester (Hv-Vickers; Hk~Knoop). The START Button willremain illuminated for the duration of the testingcycle. When the START Button light goes off the testhas been completed.

MEASUREMENT:(STANDARD MODEl). -Rotate the Objective-Indentor Turret to the 40XObjective. If the stage or sample have not beenmoved the-specimen should be in focus. lithe impres-sion does not appear in the center of the field ofview consult the maintenance instructions on page 5.

Advance the Left Filar Line (Figure 3) so that theinner edge of the line just touches the left most pointof the impression. The Left Filar Line is controlled bythe Filar Adjustment Knob to the left of the Eyepiece.

Advance the Right Filar Line so that the inner edgeof the line just touches the right most point of theimpression. The Right Filar Line is controlled by theFilar Adjustment Knob to the right of the Ey~piece.

NOTE: Measurement is achieved by touching theinside of both Filar Lines to the outer most pointsof the indentation.

Record the value of the Filar Micrometer inscribedin the Right Filar Adjustment Knob. The Micrometeris calibrated in 0.5 micron increments with onecomplete revolution of the drum being equal to 25microns. The value of the micrometer reading isequal to the width of the impression made by thepenetrator (Figure 4).

Figure 3. FILAR LINE ADJUSTMENT

Figure 4. FILAR MICROMETER EYEPIECE

For a Vickers test repeat the same procedure with theEyepiece rotated 90 degrees to measure the height ofthe impression. Average the two readings if different.It a Knoop test is being conducted only one measure-ment of the long diagonal is required.

Consult the Hardness Table book provided with thetester to determine the Vickers or Knoop value forthe size of the impression measured.

MEASUREMENT:IDIGITAL MOOED,- - -- -- -- - - - - - --,For measurement of an impression with the DigitalModel, the procedure is similar to the Standard Modelwith only a few exceptions.

Prior to making a measurement with the Digital ModelMICROMET8 II it is necessary to zero set the internalelectronics. This is accomplished by advancing theRight Filar line until it contacts the Left Filar lineand pressing the RESET Button.

The Digital Model Right Filar Adjustment Knob doesnot have inscribed graduations. To read the diagonalof an impression with the Digital Model press theREAD Button attached to the Eyepiece assembly.When the READ Button has been pushed the diagonalmeasurement in microns will appear on the controlpanel d1. For a Vickers test the Eyepiece must berotated 90 degrees and the filar lines adjusted for thesecond reading-the READ Button should be pressedagain. This measurement will appear in d2 and at thesame time the Hardness Value for the appropriate styleof test being conducted will be displayed. For Knoopstyle tests the Hardness Value will be displayed afterthe first reading.

CAUTIONS:Because of compression stress in and around animpression, any new impression made near anothermay cause inaccurate results. The required separation

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distance between impressions is four times that ofthe diagonal when measuring from center of impres-sion to center of impression. It is also necessary toposition the impression at least 2.5 times the distanceof the diagonal from the edge of the sample. If animpression is made that does not appear to be therequired distance from another impression or theedge of the sample the test should be repeated.

When testing curved surfaces it is necessary to choosea load that will restrict the diagonals from exceeding1/5 of the curvature radius. A Knoop Indentor maybe used to avoid this restriction by aligning the longdiagonal of the impression perpendicular to thecurvature direction.

Intermittent vibration or shocks that occur during thetesting of a sample will invalidate the results of thatparticular test. If vibrations are continuous it may benecessary to install shock padding or the optionalVibration Isolation Platform to assure accuracy.

MAINTENANCE:The MICROMET8 II should require minimal main-tenance to provide accurate results for many years.The accuracy of the instrument should be checkedperiodically against the Test Block included with eachtester. This is accomplished by performing a hardnesstest on the Block and comparing the measurement ofthe instrument against the knOwn hardness of the TestBlock. If the tester does not agree with the certifiedvalue of the Block recalibration may be necessaryand can be arranged by calling the Buehler Ltd. SalesOffice nearest you or by contacting Buehler Head-quarters in lake Bluff, Il at (312) 295-6500. It isrecommended that the tester be recalibrated annuallyto certify its accuracy.

ALIGNMENT: .

The MICROMETe II is shipped with the Indentor andObjectives aligned so that the identations made willappear in the center of the field of view. If the Indentoror Objectives are replaced or dislocated it may benecessary to realign the Objectives so that the impres-sion is centered.

NOTE: The MICROMEre II Indentor is fixed and can-not be moved or adjusted. Alignment is achieved bymoving the Objective so that it is centered in relationto the impression (Figure 5).

B.Rotate the Turret to the Objective to be centered.If the impression does not appear in the center ofthe field of the view, realignment is necessary.

c.To center the Objective for the X axis (left to rightin the field of view) loosen the Adjustment Screw(A,A1 or B,B1) in the directi.on you wish to movethe Objective. The Objective can then be ad-vanced in that direction by tightening the opposingScrew. When the Objective has been properlyaligned, the opposite Screw should be tightenedto secure the Objective in place.

NOTE: Unless the opposing Screw has been loosened,the Objective cannot be moved. Excessive tighteningwill cause strain and may damage the alignment sys-tem or the Objective.

D. To center the Objective for the Y axis (up or downin the field of view) it is necessary to first slightlyloosen one of the X axis Adjustment Screws toallow the Objective to travel freely. The lens canthen be aligned do~nward in the field of view bythe single Y axis Screw (C,C1). If the impression ispositioned in the lower portion of the field ofview and therefore needs to be aligned upward,the single Y axis Screw must first be loosened.

Since there is no upward Adjustment Screw theObjective must be pulled outward by hand to apoint above the center X axis. Once this has beenachieved the Y axis Adjustment Screw may beused as described above. It is important to remem-ber to retighten the X axis Adjustment Screw whenthe alignment is complete.

E. When you have centered the Objective for boththe X and Y axis,' another identation should bemade to confirm alignment.

INDENTOR REPLACEMENT:To replace a Diamond Indentor, remove the ProtectiveSleeve from the Indentor Holder. The old Indentorcan be removed by loosening the Set Screw in theHolder. Insert the new Indentor so that the red lineof the Diamond is aligned with the white arrow of theIndentor Holder (Figure 6). The Indentor is securedby retightening the alien Set Screw. The ProtectiveSleeve should be replaced to prevent inadvertent side-ward pressure against the Indentor.

MICROSCOPE BULB REPLACEMENT:To change the Microscope Bulb, loosen the lockScrew and remove the Socket from the instrument(Figure 7).

Figure 7. MICROSCOPE LAMPHOUSE

To remove the Bulb from the lamphouse Socket,push in slightly while turning it counter-clockwise.Replacement Bulbs are listed under Accessories andReplacement Parts on Page 9. To install a Bulb inthe Socket reverse the above procedure.

Reinstall the Socket in the instrument and tightenthe lock Screw. With the illuminator ON and thespecimen in place, check the viewing field for uni-form brightness. If the lighting is not uniform theBulb can be aligned in the lamphouse Socket withthe three Alignment Screws.

INDENTORS/HARDNESS CONVERSION TABLES

CAT. NO. DESCRIPTION

1~2200 Vickers Indentor

1~2201 Knoop Indentor ,:~;,,: L1E'11»2320 VicRers Table', I

1~2322 Knoop Table i

TEST BLOCKS

OBJECTIVESCAT. NO. DESCRIPTION I.

1600-2300 Achromatic M SX .

1600-2302 Achromatic M 10X

1600-2304 Achromatic M 2OX

1600-2306 Plimachromatic M Plan 4OX1600-2310 Planachromatic M Plan 100x (dry)

MEASURING EYEPIECES iCAT. NO. DESCRIPTION]:1~2~ ~aooaro r1~2SO2 Digital]).

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DATA PROCESSOR/PRINTER AND ACCESSORIES

*Requires Cable for connection to MICROMET8 II

BLACK & WHITE ccrv SYSTEM