# Calibrations Scope

## Download PDF

- Electrical SCOPE ISO 17025-2005 HK CALI – OCT 2014
- SCOPE_ISO 17025-2005_HK_CALI-OCT_2014_uncertainty_of_measurement

## Electrical SCOPE ISO 17025-2005

The Least uncertainties of measurement for Electrical quantity/measurement as per the ISO GUM:- | |||||||

1.0 | INDICATING AND RECORDING INSTRUMENTS | ||||||

MEASUREMENT FUNCTION | WITH LEAST UNCERTAINTIES OF MEASUREMENT | ||||||

1.0.1 | DC VOLTMETER | Tol(%) | Floor | ||||

0 TO ± 330.00 mV | 0.0047 | 2E-06 | |||||

0 TO ± 3.3 V | 0.0039 | 4E-06 | |||||

0 TO ± 33.0 V | 0.0039 | 4E-05 | |||||

0 TO ± 330.0 V | 0.0043 | 4E-04 | |||||

0 TO ± 1020 V | 0.0043 | 1E-03 | |||||

1.0.2 | DC CURRENT | | Tol(%) | Floor | |||

0 TO ± 330.00 µA | 0.0116 | 2E-08 | |||||

0 TO ± 3.3 mA | 0.0101 | 4E-08 | |||||

0 TO ± 33.0 mA | 0.0078 | 2E-07 | |||||

0 TO ± 330.0 mA | 0.0078 | 2E-06 | |||||

0 TO ± 3.0 A | 0.0295 | 3E-05 | |||||

0 TO ± 10.0 A | 0.0465 | 4E-04 | |||||

0 TO ± 20.5 A | 0.0775 | 6E-04 | |||||

1.0.3 | RESISTANCE | | Tol(%) | Floor | |||

0 TO 11 Ohm | 0.0093 | 8E-04 | |||||

11 TO 33 Ohm | 0.0093 | 1E-03 | |||||

33 TO 110 Ohm | 0.0070 | 1E-03 | |||||

110 TO 330 Ohm | 0.0070 | 2E-03 | |||||

330 TO 1.1 kOhm | 0.0070 | 2E-03 | |||||

1.1 TO 3.3 kOhm | 0.0070 | 2E-02 | |||||

3.3 TO 11 kOhm | 0.0070 | 2E-02 | |||||

11 TO 33 kOhm | 0.0070 | 2E-01 | |||||

33 TO 110 kOhm | 0.0085 | 2E-01 | |||||

110 TO 330 kOhm | 0.0093 | 2E+00 | |||||

330 TO 1.1 MOhm | 0.0116 | 2E+00 | |||||

1.1 TO 3.3 MOhm | 0.0116 | 2E+01 | |||||

3.3 TO 11 MOhm | 0.0465 | 4E+01 | |||||

11TO 33 MOhm | 0.0775 | 2E+03 | |||||

33 TO 110 MOhm | 0.3876 | 2E+03 | |||||

110 TO 330 MOhm | 0.3876 | 8E+04 | |||||

330 TO 1.1 GOhm | 1.1628 | 4E+05 | |||||

1.0.4 | AC VOLTAGE | FREQUENCY | Tol(%) | Floor | |||

1.0 to 33 mV | 0.01 Hz to 10 Hz | 3.876 | 1E-04 | ||||

10 Hz to 45 Hz | 0.116 | 2E-05 | |||||

45 Hz to 10 kHz | 0.078 | 2E-05 | |||||

10 to 20 kHz | 0.116 | 2E-05 | |||||

20 to 50 kHz | 0.155 | 2E-05 | |||||

50 to 100 kHz | 0.271 | 3E-05 | |||||

100 to 500 kHz | 0.775 | 5E-05 | |||||

33 to 330 mV | 0.01 Hz to 10 Hz | 3.876 | 1E-03 | ||||

10 Hz to 45 Hz | 0.039 | 2E-05 | |||||

45 Hz to 10 kHz | 0.023 | 2E-05 | |||||

10 to 20 kHz | 0.054 | 2E-05 | |||||

20 to 50 kHz | 0.078 | 3E-05 | |||||

50 to 100 kHz | 0.178 | 1E-04 | |||||

100 to 500 kHz | 0.388 | 3E-04 | |||||

330 to 3.3 V | 0.01 Hz to 10 Hz | 3.876 | 1E-02 | ||||

10 Hz to 45 Hz | 0.039 | 5E-05 | |||||

45 Hz to 10 kHz | 0.023 | 5E-05 | |||||

10 to 20 kHz | 0.054 | 5E-05 | |||||

20 to 50 kHz | 0.078 | 5E-05 | |||||

50 to 100 kHz | 0.178 | 2E-04 | |||||

100 to 500 kHz | 0.388 | 7E-04 | |||||

3.3 to 33.0 V | 0.01 Hz to 10 Hz | 3.876 | 1E-01 | ||||

10 Hz to 45 Hz | 0.039 | 6E-04 | |||||

45 Hz to 10 kHz | 0.023 | 5E-04 | |||||

10 to 20 kHz | 0.054 | 5E-04 | |||||

20 to 50 kHz | 0.078 | 5E-04 | |||||

50 to 100 kHz | 0.178 | 2E-03 | |||||

33.0 to 330.0 V | 45 Hz to 1 kHz | 0.039 | 2E-03 | ||||

1 to 10 kHz | 0.062 | 7E-03 | |||||

10 to 20 kHz | 0.070 | 7E-03 | |||||

20 to 50 kHz | 0.093 | 7E-03 | |||||

50 to 100 kHz | 0.186 | 6E-02 | |||||

330.0 to 1020.0 V | 45 Hz to 1 kHz | 0.039 | 2E-02 | ||||

1 to 5 kHz | 0.062 | 2E-02 | |||||

5 to 10 kHz | 0.070 | 2E-02 | |||||

1.0.5 | AC CURRENT | FREQUENCY | Tol(%) | Floor | |||

29 to 330 µA | 10 to 20 Hz | 0.155 | 8E-08 | ||||

20 to 45 Hz | 0.116 | 8E-08 | |||||

45 Hz to 1 kHz | 0.097 | 8E-08 | |||||

1 to 5 kHz | 0.233 | 1E-07 | |||||

5 to 10 kHz | 0.620 | 2E-07 | |||||

10 to 30 kHz | 1.240 | 3E-07 | |||||

330 to 3.3 mA | 10 to 20 Hz | 0.155 | 1E-07 | ||||

20 to 45 Hz | 0.097 | 1E-07 | |||||

45 Hz to 1 kHz | 0.078 | 1E-07 | |||||

1 to 5 kHz | 0.155 | 2E-07 | |||||

5 to 10 kHz | 0.388 | 2E-07 | |||||

10 to 30 kHz | 0.775 | 5E-07 | |||||

3.3 to 33 mA | 10 to 20 Hz | 0.140 | 2E-06 | ||||

20 to 45 Hz | 0.070 | 2E-06 | |||||

45 Hz to 1 kHz | 0.031 | 2E-06 | |||||

1 to 5 kHz | 0.062 | 2E-06 | |||||

5 to 10 kHz | 0.155 | 2E-06 | |||||

10 to 30 kHz | 0.310 | 3E-06 | |||||

33 to 330 mA | 10 to 20 Hz | 0.140 | 2E-05 | ||||

20 to 45 Hz | 0.070 | 2E-05 | |||||

45 Hz to 1 kHz | 0.031 | 2E-05 | |||||

1 to 5 kHz | 0.078 | 4E-05 | |||||

5 to 10 kHz | 0.155 | 8E-05 | |||||

10 to 30 kHz | 0.310 | 2E-04 | |||||

330 mA to 1.1 A | 10 to 45 Hz | 0.140 | 8E-05 | ||||

45 Hz to 1 kHz | 0.039 | 8E-05 | |||||

1 to 5 kHz | 0.465 | 8E-04 | |||||

5 to 10 kHz | 1.938 | 4E-03 | |||||

1.1 A to 3.0 A | 10 to 45 Hz | 0.140 | 8E-05 | ||||

45 Hz to 1 kHz | 0.047 | 8E-05 | |||||

1 to 5 kHz | 0.465 | 8E-04 | |||||

5 to 10 kHz | 1.938 | 4E-03 | |||||

3.0 A to 11 A | 45 Hz to 100 Hz | 0.047 | 2E-03 | ||||

100 Hz to 1 kHz | 0.078 | 2E-03 | |||||

1 to 5 kHz | 2.326 | 2E-03 | |||||

11 A to 20.5 A | 45 Hz to 100 Hz | 0.093 | 4E-03 | ||||

100 Hz to 1 kHz | 0.116 | 4E-03 | |||||

1 to 5 kHz | 2.326 | 4E-03 | |||||

1.0.6 | CAPACITANCE | | Tol(%) | Floor | | ||

220 pF to 400 pF | 0.388 | 8E-12 | |||||

0.4 to 1.1 nF | 0.388 | 8E-12 | |||||

1.1 nF to 3.3 nF | 0.388 | 8E-12 | |||||

3.3 nF to 11 nF | 0.194 | 8E-12 | |||||

11 to 33 nF | 0.194 | 8E-11 | |||||

33 to 110 nF | 0.194 | 8E-11 | |||||

110 to 330 nF | 0.194 | 2E-10 | |||||

330 to 1.1 µF | 0.194 | 8E-10 | |||||

1.1 to 3.3 µF | 0.194 | 2E-09 | |||||

3.3 to 11 µF | 0.194 | 8E-09 | |||||

11 to 33 µF | 0.310 | 2E-08 | |||||

33 to 110 µF | 0.349 | 8E-08 | |||||

110 to 330 µF | 0.349 | 2E-07 | |||||

330 µF to 1.1 mF | 0.349 | 8E-07 | |||||

1.1 to 3.3 mF | 0.349 | 2E-06 | |||||

3.3 to 11 mF | 0.349 | 8E-06 | |||||

11 to 33 mF | 0.581 | 2E-05 | |||||

33 to 110 mF | 0.853 | 8E-05 | |||||

1.0.7 | FREQUENCY | | Tol(%) | Floor | |||

0.01 to 119.99 Hz | 0.002 | 7.8E-04 | |||||

120 to 1200 Hz | 7.8E-04 | ||||||

1.2 to 12 kHz | 7.8E-04 | ||||||

12 to 120 kHz | 1.2E-02 | ||||||

120 to 1200 kHz | 1.2E-02 | ||||||

1.2 to 2 MHz | 1.2E-02 | ||||||

1.0.8 | DC POWER | | % of Watts Output | ||||

33 mV to 1020 V | 3.3 to 329.99 mA | 0.05 | |||||

0.33 to 11 A | 0.11 | ||||||

11 to 20 A | 0.2 | ||||||

1.0.9 | AC Power | | % of Watts Output | | |||

33 mV to 1020 V | 3.3 to 329.99 mA | 0.31 | |||||

45 Hz to 65 Hz | 0.33 to 11 A | 0.27 | |||||

11 to 20 A | 0.27 | ||||||

1.0.10 | Phase Angle | | ∆Φ degrees | ||||

33 mV to 1020 V | 10 to 65 Hz | 0.2 | |||||

65 to 500 Hz | 0.8 | ||||||

500 to 1kHz | 1.6 | ||||||

1 kHz to 5 kHz | 5 | ||||||

5 kHz to 10 kHz | 9 | ||||||

1.1 | Graphic Recording & Digital storage Recorders | ||||||

With least uncertainties as per 1.0 | |||||||

| |||||||

1.2 | Calibrators and Standards | ||||||

| MEASUREMENT FUNCTION | WITH LEAST UNCERTAINTIES OF MEASUREMENT | |||||

1.2.1 | DC VOLTAGE | | |||||

0.1 V | ±1.04 µV | ||||||

1 V | ±6.00 µV | ||||||

10 V | ±50.0 µV | ||||||

100 V | ±0.8 mV | ||||||

1000 V | ±8.0 mV | ||||||

1.2.2 | Ohms | ||||||

10 Ω | ±0.25 mΩ | ||||||

100 Ω | ±2.10 mΩ | ||||||

1 kΩ | ±0.015 Ω | ||||||

10 kΩ | ±0.15 Ω | ||||||

100 kΩ | ±1.5 Ω | ||||||

1 MΩ | ±24.0 Ω | ||||||

10 MΩ | ±0.74 kΩ | ||||||

100 MΩ | ±0.06 MΩ | ||||||

1.2.3 | DC CURRENT | ||||||

100 µA | ±2.0 nA | ||||||

1 mA | ±13.0 nA | ||||||

10 mA | ±0.13 µA | ||||||

100 mA | ±1.8 µA | ||||||

1 A | ±0.03 mA | ||||||

1.2.4 | AC CURRENT | FREQUENCY | | ||||

100 µA | 1 kHz | ±0.02 µA | |||||

1 mA | 1 kHz | ±0.20 µA | |||||

10 mA | 1 kHz | ±2.0 µA | |||||

100 mA | 1 kHz | ±20.0 µA | |||||

1 A | 1 kHz | ±0.30 mA | |||||

1.2.5 | AC VOLTAGE | FREQUENCY | | ||||

0.01 V | 1 kHz | ±5.0 µV | |||||

0.01 V | 20 kHz | ±5.0 µV | |||||

0.01 V | 100 kHz | ±8.0 µV | |||||

0.01 V | 300 kHz | ±16.0 µV | |||||

0.01 V | 1 MHz | ±0.03 mV | |||||

0.01 V | 4 MHz | ±3.10 mV | |||||

0.1 V | 1 kHz | ±0.03 mV | |||||

0.1 V | 20 kHz | ±0.03 mV | |||||

0.1 V | 100 kHz | ±0.06 mV | |||||

0.1 V | 300 kHz | ±0.10 mV | |||||

0.1 V | 1 MHz | ±0.3 mV | |||||

0.1 V | 4 MHz | ±0.41 mV | |||||

0.1 V | 8 MHz | ±0.41 mV | |||||

0.1 V | 10 MHz | ±0.47 mV | |||||

1 V | 1 kHz | ±0.3 mV | |||||

1 V | 20 kHz | ±0.3 mV | |||||

1 V | 50 kHz | ±0.3 mV | |||||

1 V | 100 kHz | ±0.2 mV | |||||

1 V | 300 kHz | ±0.5 mV | |||||

1 V | 500 kHz | ±1.1 mV | |||||

1 V | 1 MHz | ±1.9 mV | |||||

1 V | 4 MHz | ±4.1 mV | |||||

1 V | 8 MHz | ±4.1 mV | |||||

1 V | 10 MHz | ±4.7 mV | |||||

10 V | 10 Hz to 50 kHz | ±3.0 mV | |||||

10 V | 100 kHz | ±1.0 mV | |||||

10 V | 300 kHz | ±3.0 mV | |||||

10 V | 500 kHz | ±11.0 mV | |||||

10 V | 1 MHz | ±17.0 mV | |||||

10 V | 2 MHz | ±0.127 V | |||||

10 V | 4 MHz | ±0.127 V | |||||

10 V | 8 MHz | ±0.128 V | |||||

10 V | 10 MHz | ±0.46 V | |||||

100 V | 1 kHz | ±30.0 mV | |||||

100 V | 20 kHz | ±30.0 mV | |||||

100 V | 50 kHz | ±30.0 mV | |||||

100 V | 100 kHz | ±20.0 mV | |||||

1000 V | 1 kHz | ±0.1 V | |||||

1.2.6 | FREQUENCY | ||||||

1 Hz | ±5 x 10-6 | ||||||

10 MHz | ±50 x 10-8 | ||||||

1.2.7 | CAPACITANCE | ||||||

≤ 100 µF | ±0.2% | ||||||

> 100 µF | ±1% |

## SCOPE 17025

INDEX | CLASS | SUBCLASS | CAPABILITY / UNCERTAINTY | Procedure #’s |

2.1 | TEMPERATURE | Radiation pyrometers | calibration of infrared thermometers, with a spectral response range of 6.5 to 18µm, and a preset emissivity of 0.95, with least uncertainty of measurement of – ±1.8°C from 0°C to 300°C | HKC030 |

2.2 | TEMPERATURE | Digital temperature indicator systems | with least uncertainties of measurement of – using thermocouple sensor , ±0.23°C from -50°C to 250°C, using metallic resistance sensor, ±0.16°C from -50°C to 250°C, | HKC063 |

2.3 | TEMPERATURE | Ancillary temperature measuring instruments – Indicators, recorders and controllers | with least uncertainties of measurement of – for thermocouple temperature indicators, ±0.3°C from -100°C to 1000°C, for metallic resistance thermometer indicators, ±0.06°C from -200°C to 260°C, ±0.1°C from 260°C to 630°C, ±0.2°C from 630°C to 800°C, | HKC001, HKC001A |

2.4 | TEMPERATURE | Dry block calibrators | with least uncertainty of measurement of – ±0.2°C from -50°C to 250°C | HKC063 |

2.5 | TEMPERATURE | Calibration of humidity measuring devices | with least uncertainty of measurement of – ±3% RH from 10% to 90% RH | TBD |

3.1 | DIMENSIONAL | Plain plug gauges | with least uncertainties of measurement of – ±0.003mm from 0mm to 25mm, ±0.03mm from 25mm to 300mm, | HKC012, HKC034, |

3.2 | DIMENSIONAL | External micrometers | with least uncertainties of measurement of – ±0.0008mm from 0mm to 25mm, ±0.0012mm from 25mm to 75mm, ±0.0016mm from 75mm to 100mm ±0.006mm from 100mm to 250mm | HKC007,HKC008 |

3.3 | DIMENSIONAL | Electronic indicators, dial gauges and test indicators | with least uncertainty of measurement of – ±0.0008mm from 0mm to 25mm | HKC007,HKC008 |

3.4 | DIMENSIONAL | Electronic and vernier callipers | with least uncertainties of measurement of – ±0.0008mm from 0mm to 25mm, ±0.0012mm from 25mm to 75mm, ±0.0016mm from 75mm to 100mm ±0.006mm from 100mm to 250mm | HKC007,HKC008 |

3.5 | DIMENSIONAL | Feeler gauges | with least uncertainty of measurement of – ±0.003mm from 0mm to 25mm | HKC034, |

3.6 | DIMENSIONAL | Gauge blocks and accessories | with least uncertainties of measurement of – ±0.003mm from 0mm to 25mm, ±0.03mm from 25mm to 300mm, | HKC012, HKC034, |

3.7 | DIMENSIONAL | Length bars and accessories | with least uncertainties of measurement of – ±0.003mm from 0mm to 25mm, ±0.03mm from 25mm to 300mm, | HKC012, HKC034, |

3.8 | DIMENSIONAL | Precision graticules | with least uncertainty of measurement of – ±(3 µm + 3L/1000), L: mm, from 0mm to 150mm | STANDARD SCALE |

3.9 | DIMENSIONAL | Precision linear scales | with least uncertainty of measurement of – for transparent linear scales, ±(3 µm + 3L/1000), L: mm, from 0mm to 150mm | STANDARD SCALE |

4.1 | TORQUE | Torque wrenches | with least uncertainties of measurement of – ±0.5% from 0N·m to 2N·m, ±0.4% from 2N·m to 40N·m, ±0.2% from 40N·m to 400N·m, ±0.2% from 400N·m to 1500N·m, | HKC035, HKC035A, HKC037, HKC077, HKC077A |

5.1 | PRESSURE | Pressure gauges | with least uncertainties of measurement of – ±0.02 kPa from 0 kPa to 200 kPa ±1.2 kPa from 200 kPa to 10000 kPa, ±5 kPa from 10000 kPa to 60000 kPa, ±120 kPa from 60000 kPa to 100000 kPa | HKC038, HKC039, HKC039A, HKC100 |

5.2 | PRESSURE | Vacuum gauges | with least uncertainty of measurement of – ±0.02 kPa from 0 kPa abs. to 110 kPa abs. | HKC038, HKC068, |

5.3 | PRESSURE | Pressure transducers | with least uncertainties of measurement of – ±0.02 kPa from 0 kPa to 200 kPa ±1.2 kPa from 200 kPa to 10000 kPa, ±5 kPa from 10000 kPa to 60000 kPa, ±120 kPa from 60000 kPa to 100000 kPa | HKC038, HKC039, HKC039A, HKC100 |

6.1 | FLOW | Gas meters | with least uncertainties of measurement of – Air ±1.6% of F.S. from 0 Std mL/min to 300 Std mL/min, ±1.6% of F.S. from 0 Std L/min to 30 Std L/min, ±2.1% of reading or 0.05 Std L/min, whichever is greater, from 0 Std L/min to 300 Std L/min | |

6.2 | FLOW | Liquid meters | with least uncertainty of measurement of – Water, total volume of, ±1 L from 0 L to 400 L | HKC036 |

7.1 | ACOUSTIC | Sound level meters | with least uncertainty of measurement of – ±0.12 dB at 94 dB & 114 dB | HKC016 |

8.1 | FREQUENCY AND TIME | Tachometers | with least uncertainty of measurement of – (±0.001% ± 1 digit) from 0 RPM to 60000 RPM | HKC015 |

9.1 | MASS | mass standards | with least uncertainty of measurement of – ±0.2 mg from 5 mg to 220 g | HKC009 |

9.2 | MASS | Precision laboratory balances | with least uncertainty of measurement of – ±0.1 mg from 5 mg to 220 g | HKC009 |

9.3 | MASS | Industrial balances | with least uncertainty of measurement of – ±3 g up to 70 kg | HKC010 |

10.1 | FORCE | Load cells | with least uncertainties of measurement of – ±10 N from 0 to 50 kN, ±25 N up to 500 kN, | HKC055, HKC060 |

Definitions and metrology concepts taken into account when we perform our measurements:-

**1: Measurement**

– process of experimentally obtaining one or more quantity values that can reasonably be attributed to a quantity

**2: Metrology**

– science of measurement and its application

**3: Measurand**

– quantity intended to be measured

**4: Measurement principle**

– principle of measurement

– phenomenon serving as a basis of a measurement

**5: Measurement method**

– method of measurement

**6: Measurement procedure**

– detailed description of a measurement according to one or more measurement principles and to a given measurement method, based on a measurement model and including any calculation to obtain a measurement result

**7: Reference measurement procedure**

– measurement procedure accepted as providing measurement results fit for their intended use in assessing measurement trueness of measured quantity values obtained from other measurement procedures for quantities of the same kind, in calibration, or in characterizing reference materials

**8: Primary reference measurement**

– procedure

– primary reference procedure

– reference measurement procedure used to obtain a measurement result without relation to a measurement standard for a quantity of the same kind

**9: Measurement result result of measurement**

– set of quantity values being attributed to a measurand together with any other available relevant information

**10: Measured quantity value**

– value of a measured quantity

– measured value

– quantity value representing a measurement result

**11: True quantity value**

– true value of a quantity

– true value

– quantity value consistent with the definition of a quantity

**12: Conventional quantity value**

– conventional value of a quantity

– conventional value

– quantity value attributed by agreement to a quantity for a given purpose

**13: Measurement accuracy**

– accuracy of measurement

– accuracy

– closeness of agreement between a measured quantity value and a true quantity value of a measurand

**14: Measurement trueness**

– trueness of measurement

– trueness

– closeness of agreement between the average of an infinite number of replicate measured quantity values and a reference quantity value

**15: Measurement precision**

– precision

– closeness of agreement between indications or measured quantity values obtained by replicate measurements on the same or similar objects under specified conditions

**16: Measurement error**

– error of measurement

– error

– measured quantity value minus a reference quantity value

**17: Systematic measurement error**

– systematic error of measurement

– systematic error

– component of measurement error that in replicate measurements remains constant or varies in a predictable manner

**18: Measurement bias**

– bias

– estimate of a systematic measurement error

**19: Random measurement error**

– random error of measurement

– random error

– component of measurement error that in replicate

– measurements varies in an unpredictable manner

**20: Repeatability condition of measurement**

– repeatability condition

– condition of measurement, out of a set of conditions that includes the same measurement procedure, same operators, same measuring system, same operating conditions and same location, and replicate measurements on the same or similar objects over a short period of time

**21: Measurement repeatability**

– repeatability

– measurement precision under a set of repeatability conditions of measurement

**22: Intermediate precision condition of**

– measurement

– intermediate precision condition

– condition of measurement, out of a set of conditions that includes the same measurement procedure, same location, and replicate measurements on the same or similar objects over an extended period of time, but may include other conditions involving changes

**23: Intermediate precision condition of**

– measurement

– intermediate precision condition

– condition of measurement, out of a set of conditions that includes the same measurement procedure, same location, and replicate measurements on the same or similar objects over an extended period of time, but may include other conditions involving changes

**24: Intermediate precision condition of**

– measurement

– intermediate precision condition

– condition of measurement, out of a set of conditions that includes the same measurement procedure, same location, and replicate measurements on the same or similar objects over an extended period of time, but may include other conditions involving changes

**25: Reproducibility condition of measurement**

– reproducibility condition

– condition of measurement, out of a set of conditions that includes different locations, operators, measuring systems, and replicate measurements on the same or similar objects

**26: Measurement reproducibility**

– reproducibility

– measurement precision under reproducibility conditions of measurement

**27: Measurement uncertainty**

– uncertainty of measurement

– uncertainty

– non-negative parameter characterizing the dispersion of the quantity values being attributed to a measurand, based on the information used

**28: Definitional uncertainty**

– component of measurement uncertainty resulting from the finite amount of detail in the definition of a measurand

**29: Type A evaluation of measurement**

– uncertainty

– Type A evaluation

– evaluation of a component of measurement uncertainty by a statistical analysis of measured quantity values obtained under defined measurement conditions

**30: Type B evaluation of measurement**

– uncertainty

– Type B evaluation

– evaluation of a component of measurement uncertainty determined by means other than a Type A evaluation of measurement uncertainty

**31: Standard measurement uncertainty**

– standard uncertainty of measurement

– standard uncertainty

– measurement uncertainty expressed as a standard deviation

**32: Combined standard measurement**

– uncertainty

– combined standard uncertainty

– standard measurement uncertainty that is obtained using the individual standard measurement uncertainties associated with the input quantities in a measurement model

**33: Relative standard measurement**

– uncertainty

– standard measurement uncertainty divided by the absolute value of the measured quantity value

**34: Uncertainty budget**

– statement of a measurement uncertainty, of the components of that measurement uncertainty, and of their calculation and combination

**35: Expanded measurement uncertainty**

– expanded uncertainty

– product of a combined standard measurement uncertainty and a factor larger than the number one

**36: Coverage interval**

– interval containing the set of true quantity values of a measurand with a stated probability, based on the information available

**37: coverage probability**

– probability that the set of true quantity values of a measurand is contained within a specified coverage interval

**38: coverage factor**

– number larger than one by which a combined standard measurement uncertainty is multiplied to obtain an expanded measurement uncertainty

**39: Calibration**

– operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties and, in a second step, uses this information to establish a relation for obtaining a measurement result from an indication

**40: Calibration hierarchy**

– sequence of calibrations from a reference to the final measuring system, where the outcome of each calibration depends on the outcome of the previous calibration

**41: Metrological traceability**

– property of a measurement result whereby the result can be related to a reference through a documented unbroken chain of calibrations, each contributing to the measurement uncertainty

**42: Traceability**

– The abbreviated term “traceability” is sometimes used to mean metrological traceability as well as other concepts, such as ‘sample traceability’ or ‘document traceability’ or ‘instrument traceability’ or ‘material traceability’, where the history (“trace”) of an item is meant. Therefore, the full term of “metrological traceability” is preferred if there is any risk of confusion.

43: The ILAC considers the elements for confirming metrological traceability to be an unbroken metrological traceability chain to an international measurement standard or a national measurement standard, a documented measurement uncertainty, a documented measurement procedure, technical competence, metrological traceability to the SI, and calibration intervals

**44: Metrological traceability chain**

– traceability chain

– sequence of measurement standards and calibrations that is used to relate a measurement result to a reference

**45: Metrological traceability to**

– a measurement unit

– metrological traceability to a unit

– metrological traceability where the reference is the definition of a measurement unit through its practical realization

**46: Verification**

– provision of objective evidence that a given item fulfills specified requirements

**47: Validation**

– verification, where the specified requirements are adequate for an intended use

**48: Metrological comparability of**

– measurement results

– metrological comparability

– comparability of measurement results, for quantities of a given kind, that are metrologically traceable to the same reference

**49: Metrological compatibility of**

– measurement results

– metrological compatibility

– property of a set of measurement results for a specified measurand, such that the absolute value of the difference of any pair of measured quantity values from two different measurement results is smaller than some chosen multiple of the standard measurement uncertainty of that difference

**50: Measurement model**

– model of measurement

– model

– mathematical relation among all quantities known to be involved in a measurement