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Mechanical Calibration
Durometer Calibration
| Parameter / Equipment | Range | Best 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 Calibration
| Parameter / Equipment | Range | Best 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 Calibration
| Parameter / Equipment | Range | Best 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 Measurement
| Parameter / Equipment | Range | Best Uncertainty (±) |
| In-Lab Compression
and
Tension, Measure and Measuring Equipment |
(200 to 5000) lbf (5000 to 20 000) lbf (20 000 to 60 000) lbf |
1.2 lbf |
In-Lab / On-Site Compression &
Tension,
|
(0 to 2.5) N |
0.0029 N |
| On-Site Compression Measure | (30 000 to 200 000) lbf | 130 lbf |
Hardness Tester Calibration
| Brinell Hardness | Range | Best 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 Error |
0.05d 3.4 % of rdg |
| 10/3000/15 | 65 to < 159 HBW Error |
0.04d 1.8 % of rdg |
| Knoop and Vickers | Range | Best 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 | Best Uncertainty (±) |
| Indirect Verification
of Rockwell Hardness Testers |
HRB Low |
1.8 HRB |
Mass Measurement & Balance / Scale Calibration
| Parameter / Equipment | Range | Best Uncertainty (±) |
| Balances and Scales | (1 to 200) g (200 to 3000) g (3 to 5) kg (5 to 15) kg (15 to 34) kg (50 to 250) lbm (250 to 1000) lbm (1000 to 3000) lbm (3000 to 12 000) lbm |
250 μg + 2.3 μg/g |
| 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 | Best 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 |
Tachometers
| Parameter / Equipment | Range | Best Uncertainty (±) |
| Tachometers – Contact Strobo Photo |
Up to 2000 rpm Up to 20000 rpm Up to 99999 rpm |
|
Torque
| Parameter / Equipment | Range | Best Uncertainty (±) |
| Torque Tools | (16 to 160) in·lbf | 1.4 in·lbf |
| Torque Transducers | Up to 80 in·ozf Up to 40 in·lbf Up to 60 in·lbf Up to 250 ft·lbf Up to 1000 ft·lbf |
0.35 % of rdg 0.098 % of rdg 0.098 % of rdg 0.11 % of rdg 0.073 % of rdg |
| Torque Wrenches | (8 to 80) in·ozf (5 to 40) in·lbf (40 to 250) in·lbf (20 to 250) ft·lbf (250 to 1000) ft·lbf |
1.9 in·ozf 0.34 in·lbf 1.5 in·lbf 1.8 ft·lbf 7.1 ft·lbf |
“Best Uncertainty” 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 of nearly ideal measuring equipment.
Best uncertainties represent expanded uncertainties expressed at approximately the 95 % level of confidence, usually using a coverage factor of k = 2. The best uncertainty of a specific calibration performed by the laboratory may be greater than the best uncertainty due to the behavior of the customer’s device and to influences from the circumstances of the specific calibration.
Please note the uncertainties achievable on a customer's site can normally be expected to be larger than the Best Measurement Capabilities (BMC) that the accredited laboratory has been assigned as Best Uncertainty 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 uncertainty introduced by the item being calibrated, (e.g. resolution) must also be considered and this, on its own, could result in the calibration uncertainty being larger than the BMC.
