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Mechanical Calibration
Durometer
| Parameter / Equipment | Range | CMC Uncertainty (±) |
| Direct Verification of Durometer
Force |
Types A, B, E, & O Types C, D, & DO Types OO & OOO Type OOO-S Type M |
0.63 Duro 0.61 Duro 1.5 Duro 1.3 Duro 1.9 Duro |
| Tip Angle Tip Diameter Tip Radius Indenter Diameter Indenter Length |
--- | 0.01° 0.0041 mm 0.0038 mm 0.0043 mm 0.0043 mm |
| Durometer Calibrators Beam Type | Type A |
0.014 % of rdg 0.012 % of rdg |
| Durometer Test Blocks | Type A & D | 1.4 Duro |
Extensometer
| Parameter / Equipment | Range | CMC Uncertainty (±) |
| Extensometers | Up to 1 in (1 to 4) in (4 to 18) in |
0.00045 in 0.0018 in 0.008 in |
Extrusion Plastometer
| Parameter / Equipment | Range | CMC Uncertainty (±) |
| Extrusion Plastometers | Cylinder Bore Piston Measurements Temperature Load to 3 kg Load (3 to 20) kg |
0.0003 in 0.0005 in 0.09 °C 0.2 g 3.1 g |
Force
| Parameter / Equipment | Range | CMC Uncertainty (±) |
| In-Lab Compression
and
Tension, Measure and Measuring Equipment |
(200 to 5000) lbf (5000 to 20000) lbf (20 000 to 60000) lbf |
1.2 lbf |
In-Lab / On-Site Compression &
Tension,
|
(0 to 2.5) N |
0.0011 N |
| On-Site Compression Measure | (30000 to 200000) lbf | 130 lbf |
Hardness Tester
| Brinell Hardness | Range | CMC Uncertainty (±) |
| Indirect Verification of Brinell Hardness Testers per ASTM E10 at Test Condition(s): |
d is the mean of the
n mean test
diameters in
millimeters. Uncertainty is stated as a percentage of the standardized test block hardness value. |
|
| 10/500/15 |
Repeatability: > 65 to < 159
HBW |
0.05d 3.4 % of rdg |
| 10/3000/15 | 65 to < 159 HBW Error |
0.04d 1.8 % of rdg |
| Knoop and Vickers | Range | CMC Uncertainty (±) |
| Indirect Verification of Microindentation Hardness Testers (Knoop and Vickers) |
Repeatability under
forces P (gf): 100 ≤ HK ≤ 270 270 ≤ HK ≤ 720 Error |
4.3 % of rdg 1.8 % of rdg 0.91 μm |
| Rockwell Hardness | Range | CMC Uncertainty (±) |
| Indirect Verification
of Rockwell Hardness Testers |
HRB Low |
1.8 HRB |
Mass
| Parameter / Equipment | Range | CMC Uncertainty (±) |
| Mass – Measure | (0.2 to 3000) g (3 to 34) kg |
10 mg |
| Mass – Measure, Fixed Points | 50 kg 500 mg |
16 mg 2.8 μg |
Pressure
| Parameter / Equipment | Range | CMC Uncertainty (±) |
Pressure –
Pneumatic
Gauge, Gauge Only Hydraulic |
(0.07 to 0.2) psi 1000 to 15 000 psig Up to 20 000 psig |
0.0062 psi 0.0075 % of rdg 0.0075 % of rdg |
Scales and Balances
| Parameter / Equipment | Range | CMC Uncertainty (±) |
Scales and Balance Calibration |
(1 to 200) g |
250 μg + 2.3 μg/g |
Tachometers
| Parameter / Equipment | Range | CMC Uncertainty (±) |
| Tachometers – Contact Strobo Photo |
Up to 2000 rpm Up to 20000 rpm Up to 99999 rpm |
|
Torque
| Parameter / Equipment | Range | CMC Uncertainty (±) |
| Torque Tools | (16 to 160) in·lbf | 1.4 in·lbf |
| Torque Transducers | (4 to 80) in·ozf (5 to 60) in·lbf (5 to 250) ft·lbf (250 to 1000) ft·lbf |
0.047 % of rdg 0.035 % of rdg 0.068 % of rdg 0.032 % of rdg |
| Torque Wrenches | (8 to 80) in·ozf (5 to 20) in·lbf (20 to 50) in·lbf (4 to 100) ft·lbf (100 to 1000) ft·lbf |
0.37 in·ozf 0.025 in·lbf 0.020 in·lbf 0.096 ft·lbf 0.25 ft·lbf |
Velocity
| Parameter / Equipment | Range | CMC Uncertainty (±) |
| Linear Velocity | Up to 50 mm/min | 0.033 mm/min |
Calibration and Measurement Capability (CMC) is the smallest uncertainty of measurement that a laboratory can achieve within its scope of accreditation when performing more or less routine calibrations of nearly ideal measurement standards or nearly ideal measuring equipment.
Calibration
and Measurement Capabilities represent expanded uncertainties expressed at approximately the 95 %
level of confidence, usually using a coverage factor of k = 2. The actual measurement uncertainty of a
specific calibration performed by the laboratory may be greater than the CMC due to the behavior of
the customer’s device and to influences from the circumstances of the specific calibration.
Please note the actual measurement uncertainties achievable on a customer's site can normally be expected to be larger than the CMC found on the A2LA Scope. Allowance must be made for aspects such as the environment at the place of calibration and for other possible adverse effects such as those caused by transportation of the calibration equipment. The usual allowance for the actual uncertainty introduced by the item being calibrated, (e.g. resolution) must also be considered and this, on its own, could result in the actual measurement uncertainty achievable on a customer’s site being larger than the CMC.
