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Summary of Contents for Starrett 3840 Series
- Page 1 3840 Series Micro Vickers/Knoop Hardness Tester TECHNICAL SUPPORT: (201) 962-8352...
- Page 2 Contents 1. Introduction 2. Main Technical Specifications 3. Installation and Regulation of the Instrument Operational conditions Unpacking and installation Introduction to the operating board and its function keys 4. Usage of the Instrument 5. Calibration and Precautions of the Instrument 6.
- Page 3 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.
- Page 4 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) φ80 Fig.1...
- Page 5 (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.
- Page 6 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.
- Page 7 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;...
- Page 8 KEYPAD FUNCTIONS: (Fig.5). Fig.5 Upper key: Digit 1 Lower key: The shifting key between Vickers and Knoop hardness HV/HK Upper key：Digit 2 Lower key：Zero setting key, press this key to set the zero to digit. Upper key：Digit 8 Lower key：Time adding key, every pressing adds 5 seconds ＋...
- Page 9 Upper key：Digit 6 Lower key: reduction key for the luminosity of light source. 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.
- Page 10 Usage 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. D1: 0.0 T:15 N:00...
- Page 11 IMPORTANT! When testing an irregular-shaped specimen, take care not to damage the indenter when turning the turret. Press the red START button and the instrument will begin by putting the load on. The red light by the Loading sign on the left side of the keypad will blink. After the load has completed, the (Dwell) LED lights up, and at this time the dwell time begins counting down to “0”.
- Page 12 Key in digit 202, then press “SPEC” key TWICE to confirm D1 value. The cursor will move to D2 and is ready for the second measurement. TECHNICAL SUPPORT: (201) 962-8352...
- Page 13 Turn the Eyepiece by 90 . Measure the other diagonal line length the same way you did the first measurement. Key in digit 203.5; double press “SPEC” key to confirm D2 value. The screen will show hardness value automatically: “HV: 721.4”. If the operator is not sure of the correctness of present measurement, please key in D1 and D2 values (grids) again.
- Page 14 Calibration and Precautions The Eyepiece If the graduated lines observed in the vision field of the Eyepiece are blurry or not clear, you should adjust the clarification by slightly turning the eye guard in front of the eye piece accordingly. The Eyepiece should be inserted to the bottom of eyepiece tube with no space between them, otherwise it would affect the correctness of the measurement.
- Page 15 Regulation Method: Turn the Drum Wheels to enable inner sides of two graduated lines to come close together until the point that no light is visible between them. This doesn’t mean one line on top of the other. Its more like one line is to the side of the other. The “0” positions of Right Drum Wheel also should be aligned as well.
- Page 16 Usage Method of Knoop (HK) Hardness Sample Introduction of Knoop Hardness The distinguishing characteristic of Knoop test is the improvement on the indenter’s design. You only need to measure the long diagonal line length of indentation, therefore the relative error of measurement becomes smaller. Compared to the micro Vickers test, when press the test force with same value, the indentation of a Knoop hardness test is shallower, hence, it is suitable to test the thin sheet parts.
- Page 17 Max Allowed Tolerance of Display Value ±% Hardness Hardness Symbol 1 000 1 500 HV 0.01 0.015 HV 0.02 0.025 HV 0.05 HV 0.1 HV 0.2 HV 0.3 HV 0.5 HV 1 HV 2 HV 3 HV 5 HV 10 HV 20 HV 30 HV 50...
- Page 18 7.3 The Max. Allowed Tolerance of Displaying Value Max Allowed Tolerance of Display Value % Hardness Test Hardness Value（ HK） Scale Force （N） HK0.01 0.098 HK0.025 0.245 HK0.05 0.49 HK0.1 0.98 HK0.2 1.961 HK0.3 2.942 HK0.5 4.903 9.807 The specimen The surface of the specimen must be clean or penetration and/or measuring results may be distorted.
- Page 19 Packing List: The main instrument (including a micro Vickers Indenter, a 40 Objective and a 10 Objective) Item Descriptions Quantity Weights 6 PCS Weight Shaft 1 PC Cross Testing Table 1 PC Thin Specimen Testing Table 1 PC Fork-Shaped Testing Table 1 PC Fine Wire Testing Table 1 PC...
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