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Model No. 900-385
Features:
The Phase II state of the art multi-functional 900-385 twin hardness tester can be used directly to measure Rockwell and superficial Rockwell hardness and change those values of Rockwell hardness into HB, HV, HLD, HK and σb values.
Loaded with features such as ultra precise measurements, wide measuring range, automatic main test force loading/unloading, digitally displayed results, automatic printing, RS232&USB output, etc. the 900-385 is suitable for hardness testing on carbon steel, alloy steel, cast iron, non ferrous metal and engineering plastics. A perfect performer suited for any environment including heat treat facilities, tool rooms, workshops, laboratories and inspection labs.
- Digitally computes regular Rockwell® and Superficial hardness scales in one versatile tester
- Easily converts scales with the push of a button
- Complete micro-computer controlled operation affords highly sensitive and accurate readings
- Extended memory of up to 9999 test results
- Conversions to: Brinel and Vickers hardness scales
- Built-in mini printer
- Conforms to ASTM E-18
Specifications:
| Minor Load |
3 Kgf, 10 Kgf |
| Major Load |
15Kgf 60 Kgf
30 Kgf 100 Kgf
45 Kgf 150 Kgf |
| Test Force Application |
Dead Weight |
| Test Force Control |
Motorized |
| Display |
Hi-Def. Digital Readout |
| Display Resolution |
0.1HR |
| Vertical Capacity |
10.2 in. |
| Throat Depth |
5.9 in. |
| Power Supply |
single phase, AC, 1100V（can be changed as 220V, the original power supply is 110V）, 50～60Hz, 4A; |
| Weight |
265lbs Net (Shipping weigh = 300 lbs) |
| Dimensions |
720mm×240mm×825mm. |
Accessories:
- Diamond Conical Indentor
- 1/16” Carbide Ball Indentor
- 1- HRC Test Blocks
- 1- HRB Test Block
- 1- HRA Test Block
- 1- HR30N Test Block
- 1- HR30T Test Block
- Test Table 5.87” (150mm)
- Flat Anvil 2.5” (63mm)
- Std. V- Anvil
- Accessory Case
- Dust Cover
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| Scale selection |
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| Load dwell setting |
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| Auxiliary functions: |
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| Limit setting |
Data Statistics |
| Scale conversions |
Curved Surface Correction |
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| Communication status setting |
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| Memory & Time setting |
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| Testing / Pre-load |
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| Testing / Unloading |
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Principle of Rockwell hardness testing |
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The Rockwell hardness test is one of several common indentation hardness tests used today, other examples being the Brinell hardness test and Vickers hardness test. Most indentation hardness tests are a measure of the deformation that occurs when the material under test is penetrated with a specific type of indenter . In the case of the Rockwell hardness test, two levels of force are applied to the indenter at specified rates and with specific dwell times. Unlike the Brinell and Vickers tests, where the size of the indentation is measured following the indentation process, the Rockwell hardness of the material is based on the difference in the depth of the indenter at two specific times during the testing cycle. The value of hardness is calculated using a formula that was derived to yield a number falling within an arbitrarily defined range of numbers known as a Rockwell hardness scale.
The general Rockwell test procedure is the same regardless of the Rockwell scale or indenter being used. The indenter is brought into contact with the material to be tested, and a preliminary force (formally referred to as the minor load) is applied to the indenter. The preliminary force is usually held constant for a set period of time (dwell time), after which the depth of indentation is measured. After the measurement is made, an additional amount of force is applied at a set rate to increase the applied force to the total force level (formally referred to as the major load). The total force is held constant for a set time period, after which the additional force is removed, returning to the preliminary force level. After holding the preliminary force constant for a set time period, the depth of indentation is measured a second time, followed by the removal of the indenter from the test material. The measured difference between the first and second indentation depth measurements, "h", is then used to calculate the Rockwell hardness number. For many older models of Rockwell hardness machines , the operator must manually control most or all of the steps of the test procedure. Many of today's newer machines automatically perform the entire Rockwell test. |
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