Definations Measurement Standards Standard is an artifact/ instrument/experimental set up whose value of quantity it represents. It is accompanied by a stated amount of uncertainty, called accuracy. Calibration Laboratory A Laboratory which measures, examines, calibrates or otherwise determines the characteristic or performance of Standard or instrument. (ISO Guide 2 Proposed Revision) Laboratory Accreditation System A system having its own rules or procedure and management for carrying out laboratory accredication. Accrediting Body A Government authority responsible for grant, renewal and withdrawal of accreditation. Accredited Laboratory A calibration laboratory to which accrediation has been granted. Accreditation Criteria A set of requirements used by an accrediting body which a calibration laboratory must meet in order to be accredited. Laboratory Assessment Examination of a calibration laboratory to evaluate its compliance with Accreditation Criteria. Laboratory Assessor An individual or a team who carried out some or all functions related to laboratory assessment. Accredited Laboratory Calibration Report A calibration report which includes a statement by the calibration laboratory that is accredited for the calibration done and that the calibration has been performed in accordance with the conditions prescribed by the accrediting body. Approved Signatory A person recognized by an accrediting body to sign the calibration reports issued by accredited laboratory. Calibration All the operations for the purpose of determining the capability / accuracy status of measuring instrument (and if necessary to determine other metrological values). Calibration can be carried out with a view to permit the use of instrument / artifact / equipment/technique as a standard. Hardness Conversion Chart HARDENED STEEL & HARD ALLOYS | ROCKWELL STANDARDS | VICKERS | BRINELL | C | A | D | HV | BHN | 150 KG | 60 KG | 100 KG | 10 KG | 3000 Kg | DIAMOND INDENTER | | 100 mm Ball | 80 79 78 | 92.0 91.5 91.0 | 86.5 85.5 84.5 | 1865 1787 1710 | N.A. | 77 76 75 | 90.5 90.0 89.5 | 84.0 83.0 82.5 | 1633 1556 1478 | N.A. | 74 73 72 | 89.0 88.5 88.0 | 81.5 81.0 80.0 | 1400 1323 1245 | N.A. | 71 70 69 | 87.0 86.5 86.0 | 79.5 78.5 78.0 | 1160 1076 1004 | N.A. | 68 67 66 | 85.6 85.0 84.5 | 76.9 76.1 75.4 | 940 900 865 | N.A. | 65 64 63 | 83.9 83.4 82.8 | 74.5 73.8 73.0 | 832 800 772 | 739 722 706 | 62 61 60 | 82.3 81.8 81.2 | 72.2 71.5 70.7 | 746 720 697 | 688 670 654 | 59 58 57 | 80.7 80.1 79.6 | 69.9 69.2 68.5 | 674 653 633 | 634 615 595 | 56 55 54 | 79.0 78.5 78.0 | 67.7 66.9 66.1 | 613 595 577 | 577 560 543 | 53 52 51 | 77.4 76.8 76.3 | 65.4 64.6 63.8 | 560 544 528 | 525 512 496 | 50 49 48 | 75.9 75.2 74.7 | 63.1 62.1 61.4 | 513 498 484 | 481 469 455 | 47 46 45 | 74.1 73.6 73.1 | 60.8 60.0 59.2 | 471 458 446 | 443 432 421 | 44 43 42 | 72.5 72.0 71.5 | 58.5 57.7 56.9 | 434 423 412 | 409 400 390 | 41 40 39 | 70.9 70.4 69.9 | 56.2 55.4 54.6 | 402 392 382 | 381 371 362 | 38 37 36 | 69.4 68.9 68.4 | 53.8 53.1 52.3 | 372 363 354 | 353 344 336 | 35 34 33 | 67.9 67.4 66.8 | 51.5 50.8 50.0 | 345 336 327 | 327 319 311 | 32 31 30 | 66.3 65.8 65.3 | 49.2 48.4 47.7 | 318 310 302 | 301 294 286 | 29 28 27 | 64.6 64.3 63.8 | 47.0 46.1 45.2 | 294 286 279 | 279 271 264 | 26 25 24 | 63.3 62.8 62.4 | 44.6 43.8 43.1 | 272 266 260 | 258 253 247 | 23 22 21 | 62.0 61.5 61.0 | 42.1 41.6 40.9 | 254 248 243 | 243 237 231 | 20 | 60.5 | 40.1 | 238 | 226 | ROCKWELL STANDARD | ROCKWELL STANDARD | BRINELL | BRINELL VICKERS | B | F | E | H | K | A | HB | BHN -------- HV | 100kg 1/16" Ball | 60kg 1/16"Ball | 100kg 1/8"Ball | 60kg 1/8"Ball | 150kg 1/8"Ball | 60kg Diamond | 500kg 100mm Ball | 3000kg 10mm | 100 99 98 | N.A. | N.A. | N.A. | N.A. | 61.5 60.9 60.2 | 201 195 189 | 240 234 228 | 97 96 95 | N.A. | N.A. | N.A. | N.A. | 59.5 58.9 58.3 | 184 179 175 | 222 216 210 | 94 93 92 | N.A. | N.A. | N.A. |
100 | 57.6 57.0 56.4 | 171 167 163 | 205 200 195 | 91 90 89 | N.A. | N.A. | N.A. | 99.5 98.5 98.0 | 55.8 55.2 54.6 | 160 157 154 | 190 185 180 | 88 87 86 | N.A. | N.A. | N.A. | 97.0 96.5 95.5 | 54.0 53.4 52.8 | 151 148 145 | 176 172 169 | 85 84 83 | N.A. | N.A. | N.A. | 94.5 94.0 93.0 | 52.3 51.7 51.1 | 142 140 137 | 165 162 159 | 82 81 80 | N.A. | N.A. | N.A. | 92.0 91.0 90.5 | 50.6 50.0 49.5 | 135 133 130 | 156 153 150 | 79 78 77 | N.A. | N.A. | N.A. | 89.5 88.5 88.0 | 48.9 48.4 47.9 | 128 126 124 | 147 144 141 | 76 75 74 | 99.6 99.1 | N.A. | N.A. | 87.0 86.0 85.0 | 47.3 46.8 46.3 | 122 120 118 | 139 137 135 | 73 72 71 | 98.5 98.0 97.4 | -- -- 100.00 | N.A. | 84.5 83.5 82.5 | 45.8 45.3 44.8 | 116 114 112 | 132 130 127 | 70 69 68 | 96.8 96.2 95.6 | 99.5 99.0 98.0 | N.A. | 81.5 81.0 80.0 | 44.3 43.8 43.3 | 110 109 107 | 125 132 121 | 67 66 65 | 95.1 94.5 93.9 | 97.5 97.0 96.0 | N.A. | 79.0 78.5 77.5 | 42.8 42.3 41.8 | 106 104 102 | 119 117 116 | 64 63 62 | 93.4 92.8 92.8 | 95.5 95.0 94.5 | N.A. | 76.0 74.5 74.0 | 41.4 40.9 40.4 | 101 99 98 | 114 112 110 | 61 60 59 | 91.7 91.1 90.5 | 93.5 93.0 92.5 | N.A. | 74.0 73.0 72.0 | 40.0 39.5 39.0 | 96 95 94 | 108 107 106 | 58 57 56 | 90.0 89.4 88.8 | 92.0 91.0 90.5 | N.A. | 71.0 70.5 69.5 | 38.7 38.1 37.7 | 92 91 90 | 104 103 101 | 55 54 53 | 88.2 87.7 87.1 | 90.0 89.5 89.0 | N.A. | 68.5 68.0 67.0 | 37.2 36.8 36.3 | 89 87 86 | N.A. | 52 51 | 86.5 86.0 | 88.0 87.5 | N.A. | 66.0 65.0 | 35.9 35.5 | 85 84 | N.A. | 50 49 48 | 85.4 84.8 84.3 | 87.0 86.5 85.5 | N.A. | 64.5 63.5 62.5 | 35.0 34.6 34.1 | 83 82 81 | N.A. | 47 46 45 | 83.7 83.1 82.6 | 85.0 84.5 84.0 | N.A. | 61.5 61.0 60.0 | 33.7 33.3 32.9 | 80 80 79 | N.A. | 44 43 42 | 82.0 81.4 80.8 | 83.5 82.5 82.0 | N.A. | 59.0 58.0 57.5 | 32.4 32.0 31.6 | 78 77 76 | N.A. | 41 40 39 | 80.3 79.7 79.1 | 81.5 81.0 80.0 | N.A. | 56.5 55.5 54.5 | 31.2 30.7 30.3 | 75 75 74 | N.A. | 38 37 36 | 78.6 78.0 77.4 | 79.5 79.0 78.5 | N.A. | 54.0 53.0 52.0 | 29.9 29.5 29.1 | 73 72 72 | N.A. | 35 34 33 | 76.9 76.3 75.7 | 78.0 77.0 76.5 | N.A. | 51.5 50.5 49.5 | 28.7 28.2 27.8 | 71 70 69 | N.A. | 32 31 30 | 75.2 74.6 74.0 | 76.0 75.5 75.0 | N.A. | 48.5 48.0 47.0 | 27.4 27.0 26.6 | 69 68 67 | N.A. | 29 28 27 | 73.5 73.0 72.5 | 74.0 73.5 73.0 | N.A. | 46.0 45.0 44.5 | 26.0 25.5 25.0 | 66 66 65 | N.A. | 26 25 24 | 72.0 71.0 70.5 | 72.5 72.0 71.0 | N.A. | 43.5 42.5 41.5 | 24.5 24.3 24.0 | 65 64 64 | N.A. | 23 22 21 | 70.0 69.5 69.0 | 70.5 70.0 69.5 | N.A. | 41.0 40.0 39.0 | 23.5 23.0 22.5 | 63 62 62 | N.A. | 20 19 18 | 68.5 68.0 67.0 | 68.5 68.0 67.5 | N.A. | 38.0 37.5 36.5 | 22.0 21.5 21.3 | 61 61 60 | N.A. | 17 16 15 | 66.5 66.0 65.5 | 67.0 66.5 65.5 | N.A. | 35.5 35.0 34.0 | 21.0 20.5 20.0 | 60 59 59 | N.A. | 14 13 12 | 65.0 64.5 64.0 | 65.0 64.5 64.0 | N.A. | 33.0 32.0 31.5 | N.A. | 59 58 58 | N.A. | 11 10 9 | 63.5 63.0 62.0 | 63.5 62.5 62.0 | N.A. | 30.5 29.5 29.0 | N.A. | 57 57 57 | N.A. | 8 7 6 | 61.5 61.0 60.5 | 61.5 61.0 60.5 | N.A. | 28.0 27.0 26.0 | N.A. | 56 56 55 | N.A. | 5 4 3 | 60.0 59.5 59.0 | 60.0 59.0 58.5 | N.A. | 25.5 24.5 23.5 | N.A. | 55 54 54 | N.A. | 2 1 | 58.0 57.5 | 58.5 57.5 | N.A. | 23 22 | N.A. | 54 54 | N.A. | |