Starrett 3840 Series User manual

TECHNICAL SUPPORT: (201) 962-8352

3840 Series

Micro Vickers/Knoop Hardness Tester

TECHNICAL SUPPORT: (201) 962-8352

Contents

1. Introduction

2. Main Technical Specifications

3. Installation and Regulation of the Instrument

3.1 Operational conditions

3.2 Unpacking and installation

3.3 Introduction to the operating board and its function keys

4. Usage of the Instrument

5. Calibration and Precautions of the Instrument

6. Accessories (The Packing List)

7. Optional Accessories

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1Introduction

Our advanced line of Micro Vickers Series hardness testers are state-of-the-art,

precise testing systems suitable for hardness analysis of metallic specimens in

metallography laboratories or production environments.

The Starrett micro-Vickers hardness testers are versatile and user-friendly

systems, designed for the accurate hardness testing of small precision parts, thin

materials, coatings, wires and case depth determinations. The 3840 series is our

entry level micro-Vickers hardness tester, covering the load range from 10g to

1kg.

Using guidelines to ASTM E-384/92 Vickers hardness testers standards, the 3840

Vickers hardness tester will offer unmatched repeatability. This micro Vickers

hardness tester can also measure Knoop hardness after installing an optional

knoop indenter. A perfect rugged performer suited for any environment, the

Starrett Vickers hardness testers are offered with a 1 year warranty and free

lifetime technical support.

2Technical Specifications

Test forces 0.098N(10gf), 0.245N(25gf), 0.49N(50gf), 0.9807N(100gf),

1.961N(200gf), 2.942N(300gf), 4.903N(500gf), 9.807N(1kgf)

Displayed Value Tolerance：See Table 9

Test Force Application Method: automatic loading and unloading

Amplification of the Microscope: 400× (for the measurement),

100× (for observation)

Dwell time of the test force: 0~60s (5 second as a unit)

Min. graduation value of the testing drum wheel: 0.25μm/grid

Max. height of the specimen: 70 mm

Distance between the center point of the indenter and the exterior panel: 98mm

X-Y Table Graduation: 25mm x 25mm

Weight: 55 lbs (25kg)

Power source: AC110V/50~60Hz

Overall dimension (L×W×H): (415×295×503)mm

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3 Unpacking, Operational Conditions and Installation

Unpacking and Installation

Cut the belt on packing crate; remove the anti-shock cushion and remove the

instrument and the accessories kit from the crate.

Place the instrument on the prepared solid working table; (for the

construction of the working table, see Fig 1)

IMPORTANT!

Do Not Discard Shipping Crate as This May

be Needed for Future Transportation.

General Safety Instructions

1. Never use clamps, straps, any other tooling or equipment to mount specimen to

the tester anvil.

2. Always use the proper anvil supplied.

3. Be sure to use proper indenter and weight for material and hardness to be tested.

180

300

φ80

Fig.1

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Hardness Tester Maintenance

1. Consult operation instructions for specific maintenance and adjusting procedures.

2. Keep the tool clean for best results.

3. Remove adjusting tools and wrenches. Form habit of checking that adjusting tools

are removed before using machine.

4. Keep all parts in working order. Check to determine that the parts will operate

properly and perform their intended function.

5. Check for damaged parts. Check for alignment, binding, breakage, mounting and

any other condition that may affect tool's operation.

6. Part that is damaged should be properly repaired or replaced. Do not perform

makeshift repairs. (Use the parts list provided to order replacement parts.)

Operating Conditions:

The 3840 series Micro Vickers Hardness Testers are a precise yet sensitive

instrument that should be handled with care. Please be sure to mount on a sturdy

bench in a clean temperature-controlled room for best results. This instrument

should be perfectly level before performing any tests.

Fig.2

1. Upper Cover 2. Microscope 3. Rotating Plate 4. Indenter 5. Cross Testing Table

6. Up and Down Lead Screw 7. Screw 8. Power Switch 9. Power Cord and Fuse

10. Leveling Feet 11. Hand Wheel 12. Screen 13. 10× Objective 14. 40× Objective

15. Right Drum Wheel 16.Load-Change Hand Wheel 17. Left Drum Wheel

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Set Up –Installation:

Take out the 4 Leveling Feet (10) from the accessories kit and screw them in

the holes on the base panel of the instrument. Unpack the gauze band wrapped

on the Up and Down Lead Screw (6) and Hand Wheel (11) (Fig.2).

Gently remove the anti-shock paper on the indenter with both the hands. Clean

the indenter gently with rubbing alcohol.

Open the Upper Cover of the machine and remove the two Anti-Shock Screws as

shown in Fig.3.

Remove the protective paper on the

Weight Seat and remove the Weight

Seat Cover. Take the Weight shaft

(21) and Weights (22) out of the

accessories kit and clean them

thoroughly. (Clean the supporting

surface of the Weight Axis with cloth

dipped with some oil so as to protect

it against rust.) Put the six Weights

on the Weight Axis in the order from

small to big (see Fig 4).

Fig.3

21.Weight Shaft 22.Weights

23.Weight Shaft Peg 24. V-Shaped Groove

Fig.4

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Hold the top of the Weight shaft, put the Weight shaft into the Weight

Seat and rotate the Weight shaft so that the Weight shaft Peg (23) may

fall into the V-shaped Groove (24) of the lever.

Cover the Weight Seat with the Weight Seat Cover.

Rotate the Load-Change Hand Wheel (16) of testing force, so as to

make the Weight Seat move up and down smoothly on the groove;

Take the dust-protecting cover of the eyepiece tube out and insert

the Microscope (2) into the hole of eyepiece tube until its flush.

Take the X-Y Slide (5) out of accessories kit and clean off the rust

protecting oil on it.

Insert the shaft of the X-Y Stage into the hole on the Elevating Lead

Screw and tighten it with the Screw (7).

Take the supplied bullseye level out of the accessories kit and put it

on the X-Y slide, and then adjust the leveling feet accordingly.

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KEYPAD FUNCTIONS: (Fig.5).

Fig.5

Upper key：Digit 2

Lower key：Zero setting key, press this key to set the zero to digit.

CLR

Upper key: Digit 1

Lower key: The shifting key between Vickers and Knoop hardness

HV/HK

Upper key：Digit 8

Lower key：Time adding key, every pressing adds 5 seconds

T＋

Upper key：Digit 9

Lower key: Time deducting key, every pressing shorten 5 seconds

T－

Upper key: Digit 5

Lower key: addition key for the luminosity of light source.

L+

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Upper key：Digit 6

Lower key: reduction key for the luminosity of light source.

L-

Upper key: Radix point.

Lower Key: After press SPEC key, press this key to let the Lower keys

become valid and the cursor will disappear.

SPEC

Double pressing this key means confirmation. For example: after key in D1

value 202, double press this key to confirm D1. As same, after key in D2

value 203.5 double press this key to confirm D2. The hardness value on the

screen will be “HV: 721.4”.

SPEC key is special function key. Single press this key, then press

key to let Upper keys become valid. And as the same, single press SPEC

key, then press

key to let Lower keys become valid.

Upper key: Digit 4.

Lower key: After press SPEC key, press this key to let all Upper

keys (digit keys) become valid and the cursor will blink.

START

Upper key: Digit 7.

Lower Key (Start key): Press this key to start the motor and apply test

force.

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4Usage of the Instrument

Slowly, gently rotate the Load-Change Hand Wheel to make the testing force

meet the requirements of the application.

Turn the Power Switch (8) on and the Screen (12) will show the Model of

hardness tester and then will display the main testing screen as shown below.

Adjusting Light Source: Press the “L+” or “L-” buttons to adjust the

brightness for your optimal vision.

Dwell Time Setting: The 900-390- is preset at 15 seconds since this is the

most common time needed for a micro Vickers test. You can adjust this time

by pressing the “T+” or “T-“ buttons. Each button press will add or subtract 5

seconds from the preset time.

Setting the Eyepiece: Turn the Rotating Plate (3) to make the 40×objective

(14) face in the front direction. The general amplification is 400×(The

eyepiece, objectives and specimen are in the focusing state).

Taking a Test: Place the supplied hardness test block or a known specimen

on the Testing Table and then rotate the Hand Wheel to raise the Testing Table.

Look through the Eyepiece to observe. When the hardness block or the

specimen comes into the distance of 1~2 mm under the Objective, at this

point, in the center of the vision field of the Eyepiece appears a bright spot,

which shows it is very close to the focusing plane. At this time, continue

raising the Testing Table up slowly until the hardness block or specimen

surface forms a clear image in the Eyepiece. If two moveable graduated lines

observed in the vision field of the Eyepiece seem vague, turn the eye guard on

the Eyepiece to bring into clear focus. You should now see the grain of the

block very clearly.

Turn the Indenter to the front direction of instrument. At this point, the

distance between the tip of Indenter and the plane of specimen is about

0.4~0.5 mm.

D1: 0.0 HV:

D2: T:15 N:00

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