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JJF 1001-2011

JJF 1001-2011_English: PDF (JJF1001-2011)
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JJF 1001-2011English755 Add to Cart 0--10 minutes. Auto-delivered. General Terms in Metrology and Their Definitions JJF 1001-2011 Valid JJF 1001-2011

Standard ID JJF 1001-2011 (JJF1001-2011)
Description (Translated English) General Terms in Metrology and Their Definitions
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A50
Classification of International Standard 17.020
Word Count Estimation 57,552
Date of Issue 2011-11-30
Date of Implementation 2012-03-01
Older Standard (superseded by this standard) JJF 1001-1998
Quoted Standard ISO/IEC GUIDE 99-2007; ISO/IEC 80000-2006; ISO/IEC 98-3
Adopted Standard ISO/IEC GUIDE 99-2007, NEQ; ISO/IEC 80000-2006, NEQ, ISO/IEC 98-3, NEQ
Drafting Organization State Administration of Quality Supervision, Inspection and Quarantine Measurement Department
Administrative Organization National Technical Committee of Legal Metrology management
Regulation (derived from) State Administration of Quality Supervision, Inspection and Quarantine No. 202 of 2011
Summary This standard specifies the measurement commonly used terms and their definitions work. This standard applies to the field of metrology work, related fields can use and reference.

JJF 1001-2011
General terms in metrology and their definitions
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC
Table of Contents
Introduction ... 12
1 Scope ... 14
2 Normative references ... 14
3 Quantity and unit ... 14
3.1 Quantity [VIM1.1] ... 14
3.2 System of quantities [VIM1.3]... 15
3.3 International system of quantities, ISQ [VIM1.6] ... 15
3.4 Base quantity [VIM1.4] ... 16
3.5 Derived quantity [VIM1.5] ... 16
3.6 Dimension of a quantity [VIM1.7] ... 16
3.7 Quantity of dimension one [VIM1.8] ... 18
3.8 Measurement unit [VIM1.9] ... 18
3.9 Symbol of measurement unit ... 19
3.10 System of units [VIM1.13] ... 19
3.11 Coherent derived unit [VIM1.12] ... 19
3.12 Coherent system of units [VIM1.14] ... 20
3.13 International System of Units (SI) [VIM1.16] ... 20
3.14 Legal unit of measurement ... 21
3.15 Base unit [VIM1.10] ... 22
3.16 Derived unit [VIM1.11] ... 22
3.17 Off-system measurement unit [VIM1.15] ... 22
3.18 Multiple unit [VIM1.17] ... 23
3.19 Submultiple of a unit [VIM1.18] ... 23
3.20 Quantity value [VIM1.19] ... 24
3.21 True quantity value, true value of quantity [VIM2.11] ... 25
3.22 Conventional quantity value [VIM2.12] ... 25
3.23 Numerical quantity value, numerical value of quantity [VIM1.20] ... 26
3.24 Quantity equation [VIM1.22] ... 26
3.25 Unit equation [VIM1.23] ... 27
3.26 Conversion factor between units [VIM1.24] ... 27
3.27 Numerical value equation [VIM1.25] ... 27
3.28 Ordinal quantity [VIM1.26] ... 28
3.29 Quantity-value scale [VIM1.27] ... 28
3.30 Ordinal quantity-value scale [VIM1.28] ... 28
3.31 Conventional reference scale [VIM1.29] ... 29
3.32 Nominal property [VIM1.30] ... 29
4 Measurement ... 29
4.1 Measurement [VIM2.1] ... 29
4.2 Metrology ... 30
4.3 Metrology [VIM2.2] ... 30
4.4 Measurement principle [VIM2.4] ... 30
4.5 Measurement method [VIM2.5] ... 30
4.6 Measurement procedure [VIM2.6] ... 31
4.7 Measurand [VIM2.3] ... 31
4.8 Influence quantity [VIM2.52] ... 32
4.9 Comparison ... 33
4.10 Calibration [VIM2.39] ... 33
4.11 Calibration diagram [VIM4.30] ... 34
4.12 Calibration curve [VIM4.31] ... 34
4.13 Calibration hierarchy [VIM2.40] ... 34
4.14 Metrological traceability [VIM2.41] ... 35
4.15 Metrological traceability chain [VIM2.42] ... 36
4.16 Metrological traceability to a measurement unit [VIM2.43] ... 36
5 Measurement results ... 37
5.1 Measurement result, result of measurement [VIM2.9] ... 37
5.2 Measured quantity value [VIM2.10] ... 37
5.3 Measurement error, error of measurement [VIM2.16] ... 38
5.4 Systematic measurement error, systematic error of measurement [VIM2.17]
... 38
5.5 Measurement bias [VIM2.18] ... 39
5.6 Random measurement error, random error of measurement [VIM2.19] ... 39
5.7 Correction [VIM2.53] ... 39
5.8 Measurement accuracy, accuracy of measurement [VIM2.13] ... 40
5.9 Measurement trueness, trueness of measurement [VIM2.14] ... 40
5.10 Measurement precision [VIM2.15] ... 40
5.11 Intermediate precision condition of measurement [VIM2.22] ... 41
5.12 Intermediate measurement precision [VIM2.23] ... 41
5.13 Measurement repeatability [VIM2.21] ... 42
5.14 Measurement repeatability condition of measurement [VIM2.20] ... 42
5.15 Measurement reproducibility condition of measurement [VIM2.24] ... 42
5.16 Measurement reproducibility [VIM2.25] ... 42
5.17 Experimental standard deviation ... 43
5.18 Measurement uncertainty, uncertainty of measurement [VIM2.26] ... 43
5.19 Standard uncertainty [VIM2.30] ... 44
5.20 Type A evaluation of measurement uncertainty [VIM2.28] ... 44
5.21 Type B evaluation of measurement uncertainty [VIM2.29] ... 44
5.22 Combined standard uncertainty [VIM2.31] ... 45
5.23 Relative standard uncertainty [VIM2.32] ... 45
5.24 Definitional uncertainty [VIM2.27] ... 45
5.25 Uncertainty report [VIM2.33] ... 46
5.26 Target uncertainty [VIM2.34] ... 46
5.27 Expanded uncertainty [VIM2.35] ... 46
5.28 Coverage interval [VIM2.36] ... 46
5.29 Coverage probability [VIM2.37] ... 47
5.30 Coverage factor [VIM2.38] ... 47
5.31 Measurement model, model of measurement [VIM2.48] ... 47
5.32 Measurement function [VIM2.49] ... 47
5.33 Input quantity in a measurement model [VIM2.50] ... 48
5.34 Output quantity in measurement model [VIM2.51] ... 48
5.35 Metrological comparability of measurement results [VIM2.46] ... 48
5.36 Metrological compatibility of measurement results [VIM2.47] ... 49
6 Measuring instruments ... 50
6.1 Measuring instrument [VIM3.1] ... 50
6.2 Measuring system [VIM3.2] ... 50
6.3 Indicating measuring instrument [VIM3.3] ... 50
6.4 Displaying measuring instrument [VIM3.4] ... 50
6.5 Material measure [VIM3.6] ... 51
6.6 Measuring equipment ... 51
6.7 Measuring transducer [VIM3.7] ... 51
6.8 Sensor [VIM3.8] ... 51
6.9 Detector [VIM3.9] ... 52
6.10 Measuring chain [VIM3.10] ... 52
6.11 Displayer ... 53
6.12 Recorder ... 53
6.13 Index ... 53
6.14 Scale of measuring instrument ... 53
6.15 Scale length ... 53
6.16 Scale division ... 54
6.17 Scale spacing ... 54
6.18 Scale interval ... 54
6.19 Adjustment of a measuring system [VIM3.11] ... 54
6.20 Zero adjustment of a measuring system [VIM3.12] ... 55
7 Property of measuring instruments ... 55
7.1 Indication [VIM4.1] ... 55
7.2 Blank indication [VIM4.2] ... 55
7.3 Indication interval [VIM4.3] ... 55
7.4 Nominal quantity value [VIM4.6] ... 56
7.5 Nominal indication interval [VIM4.4] ... 56
7.6 Range of a nominal indication interval, span of a nominal indication interval
[VIM4.5] ... 56
7.7 Measuring interval [VIM4.7]... 57
7.8 Steady state operating condition [VIM4.8] ... 57
7.9 Rated operating condition [VIM4.9] ... 57
7.10 Limiting operating condition [VIM4.10] ... 57
7.11 Reference operating condition [VIM4.11] ... 58
7.12 Sensitivity of a measuring system [VIM4.12] ... 58
7.13 Selectivity of a measuring system [VIM4.13] ... 58
7.14 Resolution [VIM4.14] ... 59
7.15 Resolution of a display device [VIM4.15] ... 60
7.16 Discrimination threshold [VIM4.16] ... 60
7.17 Dead band [VIM4.17] ... 60
7.18 Detection limit, limit of detection [VIM4.18] ... 60
7.19 Stability of a measuring instrument [VIM4.19] ... 60
7.20 Instrument bias [VIM4.20] ... 61
7.21 Instrument drift [VIM4.21] ... 61
7.22 Variation due to an influence quantity [VIM4.22] ... 61
7.23 Step response time [VIM4.23] ... 61
7.24 Instrumental measurement uncertainty [VIM4.24] ... 62
7.25 Null measurement uncertainty [VIM4.29] ... 62
7.26 Accuracy class [VIM4.25] ... 62
7.27 Maximum permissible measurement errors [VIM4.26] ... 63
7.28 Datum measurement error [VIM4.27] ... 63
7.29 Zero error [VIM4.28] ... 63
7.30 Intrinsic error ... 63
7.31 Fiducially error ... 63
7.32 Error of indication ... 64
8 Measurement standards ... 64
8.1 Measurement standard, etalon [VIM5.1] ... 64
8.2 International measurement standard [VIM5.2] ... 65
8.3 National measurement standard [VIM5.3] ... 65
8.4 Primary measurement standard [VIM5.4] ... 66
8.5 Secondary measurement standard [VIM5.5] ... 66
8.6 Reference measurement standard [VIM5.6] ... 67
8.7 Working measurement standard [VIM5.7] ... 67
8.8 Traveling measurement standard [VIM5.8] ... 67
8.9 Transfer measurement device [VIM5.9] ... 67
8.10 Check device ... 68
8.11 Intrinsic measurement standard [VIM5.10] ... 68
8.12 Conservation of a measurement standard [VIM5.11] ... 69
8.13 Calibrator [VIM5.12] ... 69
8.14 Reference material, RM [VIM5.13] ... 69
8.15 Certified reference material, CRM [VIM5.14] ... 70
8.16 Commutability of reference material [VIM5.15] ... 71
8.17 Reference data [VIM5.16] ... 71
8.18 Standard reference data [VIM5.17] ... 72
8.19 Reference quantity value [VIM5.18] ... 72
9 Legal metrology and metrological management ... 73
9.1 Legal metrology ... 73
9.2 Law on metrology ... 73
9.3 Metrological assurance ... 73
9.4 Legal metrological control ... 73
9.5 Service of legal metrology ... 73
9.6 Legal control of measuring instrument ... 74
9.7 Metrological supervision ... 74
9.8 Metrological expertise ... 74
9.9 Type (pattern) evaluation ... 74
9.10 Type approval ... 74
9.11 Type approval with limited effect ... 74
9.12 Examination for conformity with approval type ... 75
9.13 Recognition of type approval ... 75
9.14 Withdrawal of type approval ... 75
9.15 Conformity assessment of a measuring instrument ... 75
9.16 Preliminary examination ... 76
9.17 Verification of a measuring instrument ... 76
9.18 Verification by sampling ... 76
9.19 Initial verification ... 76
9.20 Subsequent verification ... 77
9.21 Mandatory periodic verification ... 77
9.22 Voluntary verification ... 77
9.23 Arbitrate verification ... 77
9.24 Rejection of a measuring instrument ... 77
9.25 Recognition of verification ... 77
9.26 Inspection of a measuring instrument ... 77
9.27 Marking ... 78
9.28 Verification mark ... 78
9.29 Obliteration of verification mark ... 78
9.30 Type approval certificate ... 78
9.31 Verification certificate ... 78
9.32 Metrological expertise certificate ... 78
9.33 Rejection notice ... 78
9.34 Rejection mark ... 79
9.35 Sealing mark ... 79
9.36 Type approval mark ... 79
9.37 Legally controlled measuring instrument ... 79
9.38 Measuring instruments acceptable for verification ... 79
9.39 Approved type ... 79
9.40 Specimen of an approved type ... 79
9.41 Type evaluation report ... 80
9.42 Products in prepackages ... 80
9.43 Prepackage goods ... 80
9.44 Net contain of prepackage goods... 80
9.45 Examination of measurement standard ... 80
9.46 Testing ... 80
9.47 Laboratory accreditation ... 81
9.48 Proficiency testing ... 81
9.49 Intermediate checks ... 81
9.50 Regulation for verification ... 81
9.51 National regulation for verification ... 81
9.52 International recommendation ... 81
9.53 International documents ... 81
9.54 OIML certificate system for measuring instruments ... 82
9.55 OIML certificate of conformation ... 82
9.56 Metrological confirmation ... 82
9.57 Measurement management system ... 82
9.58 Hierarchy scheme ... 83
9.59 National hierarchy scheme ... 83
9.60 Dissemination of the value of quantity ... 83
Index in English ... 84
General terms in metrology and their definitions
1 Scope
This specification specifies the commonly used terms and their definitions in
This specification applies to all tasks in the field of metrology. The related fields
can also refer to it.
2 Normative references
This specification refers to the following documents:
ISO/IEC 98-3 Uncertainty of measurement - Part 3: Guide to the expression of
uncertainty in measurement
ISO/IEC GUIDE 99:2007 International vocabulary of metrology -Basic and
general concepts and associated terms (VIM))
ISO/IEC 80000:2006 Quantity and units
For dated reference documents, only the dated version applies to this
specification; for undated reference documents, the latest version (including all
amendments) applies to this specification.
3 Quantity and unit
3.1 Quantity [VIM1.1]
The property of a phenomenon, object or substance, the size of which can be
represented by a number and a reference object.
1 Quantity can refer to a general concept or a specific quantity, as shown in Table
2 The reference object can be a measurement unit, measurement procedure,
reference material or a combination thereof.
where the index is called the dimensional index, which can be positive, negative
or zero.
3.7 Quantity of dimension one [VIM1.8]
Also known as dimensionless quantity
In its dimensional expression, the quantity whose exponents of the factors
corresponding to the base quantities are all zero.
1 The term "dimensionless quantity" is widely used and has been retained for
historical reasons because all exponents in the dimensional symbolic
expressions of these quantities are zero. The "quantity of dimension one" reflects
the convention of using the symbol 1 as the symbolic expression of the
dimensions of these quantities.
2 The measurement unit and value of a quantity of dimension one are both numbers,
but such a quantity expresses more information than a number.
3 Certain quantities of dimension one are defined as the ratio of two homogeneous
Examples: plane angle, solid angle, refractive index, relative permeability, mass
fraction, friction coefficient, Mach number.
4 The number of entities is a quantity of dimension one.
Example: the number of turns of the coil, the number of molecules of a given
sample, the decline of the energy level of the quantum system.
3.8 Measurement unit [VIM1.9]
Measurement unit, unit of measurement
Referred to as unit
According to the agreed definition and adopted scalar quantity, any other similar
quantity can be compared with it so that the ratio of the two quantities is
represented by a number.
1 The measurement unit has the name and symbol assigned according to the
2 Sometimes conventional quantity value is an estimate of the true value.
3 The conventional quantity value is generally considered to have a reasonably
small (possibly zero) measurement uncertainty.
3.23 Numerical quantity value, numerical value of quantity
Abbreviated as numerical value
The value represented by the quantity value, which is not any number of the
reference object.
1 For a quantity of dimension one, the reference object is a measurement unit,
which is a number, but the number is not part of the value of the quantity.
Example: In the mole fraction equal to 3 mmol/mol, the value of the quantity is 3,
the unit is mmol/mol. The unit mmol/mol is equal to the number 0.001, but the
number 0.001 is not part of the value of the quantity; the value of the quantity is
2 For quantities with measurement units (that is, those quantities that are not
sequential quantities), the value of Q {Q} is often expressed as {Q} = Q/[Q],
wherein [Q] represents the measurement unit.
Example: For a quantity value of 5.7 kg, the quantity value is {m} = (5.7 kg)/kg =
5.7. The same value can be expressed as 5700 g, in this case, the value of the
amount is {m} = (5700g)/g = 5700.
3.24 Quantity equation [VIM1.22]
Giving the mathematical relationship between the quantities in the system of
quantities, which has nothing to do with the unit of measurement.
1 Q1 = ζQ2Q3, where Q1, Q2 and Q3 represent different quantities, whilst ζ is a digital
2 T = (1/2) mv2, where T is the kinetic energy, m is the mass, v is the velocity of a
specific particle.
3 n = It/F, where n is the amount of substance, I is the current, t is the duration of
1 The measurement is not applicable to the nominal property (see 3.32).
2 Measurement means the comparison of quantities and includes the counting of
3 The prerequisites for measurement are the description of the quantity suitable for
the intended use of the measurement result, the measurement procedure, a
calibrated measurement system that operates in accordance with the prescribed
measurement procedure (including measurement conditions).
4.2 Metrology
Activities to achieve unified unit, accurate and reliable quantity.
4.3 Metrology [VIM2.2]
The science of measurement and its application.
Note: Metrology covers the theory of measurement and all application fields
regardless of its measurement uncertainty.
4.4 Measurement principle [VIM2.4]
A phenomenon used as a basis for measurement.
1 Thermoelectric effect used to measure temperature;
2 Energy absorption used to measure the amount-of substance concentration;
3 The drop of glucose concentration in the blood of fast-running rabbits is used to
measure the insulin concentration during preparation.
Note: The phenomenon can be a physical phenomenon, a chemical phenomenon
or a biological phenomenon.
4.5 Measurement method [VIM2.5]
A general description of the logical arrangement of operations used in the
measurement process.
4.11 Calibration diagram [VIM4.30]
A diagram showing the relationship between the indicated value and the
corresponding measurement result.
1 The calibration diagram is a strip on the plane defined by the indicating axis and
the measurement result axis, which shows the relationship between the
indicating value and a series of measured values. It gives a one-to-many
relationship. For a given indication, the width of the strip provides the
measurement uncertainty of the instrument.
2 Other ways to express this relationship include a calibration curve with
measurement uncertainty, a calibration form, or a set of functions.
3 This concept is suitable for calibration when the measurement uncertainty of the
instrument (see 7.24) is greater than the measurement uncertainty of the
measurement standard.
4.12 Calibration curve [VIM4.31]
A curve representing the relationship between the indicated value and the
corresponding measured value.
Note: The calibration curve shows a one-to-one relationship, because it has no
information about the measurement uncertainty, it does not provide measurement
4.13 Calibration hierarchy [VIM2.40]
The sequence of calibration from the reference object to the final system of
measurement. The result of each level of calibration depends on the result of
the previous level of calibration.
1 Along the calibration sequence, the measurement uncertainty will inevitably
increase step by step.
2 The calibration hierarchy is composed of one or more measurement standards
and system of measurements operated in accordance with measurement
3 The reference object in this definition can be the definition of the measurement
5.17 Experimental standard deviation
Referred to as experimental standard deviation
When performing n measurements on the same measured, the quantity which
characterizes the dispersion of measurement results. It is represented by the
symbol s.
1 The experimental standard deviation s (xk) of a single measured value xk in n
measurements can be calculated according to the Bessel formula:
Where: xi - The measured value of the ith measurement;
n - The number of measurements;
- The arithmetic average of a group of measured values obtained from n
2 The experimental standard deviation s ( ) of the arithmetic mean of n
measurements is:
5.18 Measurement uncertainty, uncertainty of measurement
Referred to as uncertainty
According to the information used, the non-negative parameters that
characterizes the dispersion as assigned to the measured quantity value.
1 The measurement uncertainty includes the components caused by the influence
of the system, such as the components related to the correction value and the
value assigned by the measurement standard as well as the defined uncertainty.
Sometimes the estimated system influence is not corrected, but treated as an
6.20 Zero adjustment of a measuring system [VIM3.12]
Referred to as zero adjustment
In order to make the system of measurement provide a zero indication
corresponding to the zero value being measured, the adjustment of the system
of measurement.
7 Property of measuring instruments
7.1 Indication [VIM4.1]
The quantity value given by the measuring instrument or measuring system.
1 The displayed value can be expressed in visual form or sound form; it can also
be transmitted to other devices. The indication value is usually given by the
position indicated on the analog output display, the number displayed or printed
by the digital output, the code pattern of the code output, the assignment of the
material measure.
2 The indicated value and the corresponding measured value need not be the
quantity value of same kinds.
7.2 Blank indication [VIM4.2]
Also known as background indication
The indication as obtained from the phenomenon, object or substance similar
to the quantity being studied, assuming that the quantity concerned does not
exist or does not contribute to the indication.
7.3 Indication interval [VIM4.3]
A set of values within the interval of the limit indications.
1 The indication interval can be expressed in units marked on the display device,
for example: 99 V ~ 201 V.
2 In some fields, this term is also called "range of indication."
1 The ability of a system of measurement with a mass spectrometer to measure the
ion current ratio generated by two specified compounds without being interfered
by other specified current sources;
2 The ability of the system of measurement to measure the power of a signal
component at a given frequency without being interfered by many other signal
components or other frequency signals;
3 Where there are often frequencies slightly different from the frequency of the
desired signal, the ability of receiver to distinguish between the desired signal
and the unwanted signal;
4 In the presence of accompanying radiation, the ability of the ionizing radiation
system of measurement to respond to the given radiation being measured;
5 The ability of the measuring system to measure the amount-of-substance
concentration of sarcosinuria in plasma using a certain procedure without being
affected by glucose, urate, ketones and proteins;
6 When the mass spectrometer measures the amount-of-substance of 28Si isotope
and 30Si isotope in geological mines, the ability of not being affected by the two
or from 29Si isotope.
1 In physics, selectivity means that there is only one measured, the other quantities
are the same kind of quantities of the measured, meanwhile they are the input
quantities of the system of measurement.
2 In chemistry, the quantity to be measured in the system of measurement usually
contains different components, meanwhile these quantities do not necessarily
belong to the same type.
3 In chemistry, the selectivity of the system of measurement is usually obtained by
the amount of selected component's concentration within a specified range.
4 The "selectivity" used in physics (see Note 1) is conceptually close to the
"specificity" sometimes used in chemistry.
7.14 Resolution [VIM4.14]
The smallest change of the measured that causes the corresponding indication
to produce a noticeable change.
Note: The resolution may be related to noise (internal or external) or friction, or
A measurement standard recognized by a national authority and used as the
basis of other measurement standards for similar quantities in a country or
Note: In China, it is called metrological benchmark or national metrological
8.4 Primary measurement standard [VIM5.4]
Referred to as the primary standard
A measurement standard established using a primary reference measurement
procedure or a conventional selection of an artifact.
1 The primary measurement standard for the amount-of-substance concentration
is prepared by dissolving the chemical components of a known substance in a
solution of a known volume.
2 The primary measurement standard of pressure is based on the separate
measurement of force and area.
3 Primary measurement standards for ratio measurement of the amount-of-
substance of isotope are prepared by mixing prescribed isotopes of known
4 The triple point bottle of water is used as the primary measurement standard for
thermodynamic temperature.
5 The international original kilogram is a man-made article agreed upon.
8.5 Secondary measurement standard [VIM5.5]
Referred to as secondary standard
A measurement standard established by calibrating it with the primary
measurement standard of the quantities of same kind.
1 This relationship between the secondary measurement standard and the primary
measurement standard can be obtained through direct calibration, or the
secondary measurement standard can be given measurement results through a
media system of measurement as calibrated by the primary measurement
c) A fishtail paper towel that clarifies the mass fraction of dioxins contained in it is
used as a calibrator.
2 Examples of reference materials with nominal property:
a) One or more color maps of designated colors;
b) DNA compounds containing specific nucleic acid sequences;
c) Urine containing 19-androstenedione.
4 Reference materials are sometimes integrated with special devices.
1 The substance with a known triple point in the triple-point bottle;
2 Glass with known optical density placed on the transmission filter holder;
3 Small balls of uniform size placed on the microscope slide.
5 The measurement of the value of some standard materials is traceable to a
measurement unit outside the SI system. Such materials include vaccines whose
value is traceable to the International Unit (IU) designated by the World Health
6 In a particular measurement, the given standard material can only be used for
either calibration or quality assurance.
7 The description of the standard material shall include the traceability of the
material, indicating its source and processing.
8 International Organization for Standardization/Standard Substances Committee
has a similar definition, but the term "measurement process" means "inspection",
which includes both quantity measurement and inspection of nominal property.
8.15 Certified reference material, CRM [VIM5.14]
Reference materials which are attached with documents issued by an
authoritative organization, provide one or more characteristic values with
uncertainty and traceability obtained using effective procedures.
Example: In the attached certificate, the human serum with the assignment of
cholesterol concentration and its measurement uncertainty is used as a calibrator
or a substance to control the accuracy of measurement.
9 Legal metrology and metrological management
9.1 Legal metrology
In order to meet statutory requirements, the measurement activities involving
measurement, measurement units, measurement instruments, measurement
methods and measurement results carried out by qualified institutions, which
are part of metrology.
9.2 Law on metrology
The law that defines legal metrology units, stipulates the tasks of legal
metrology and the basic structure of its operation.
9.3 Metrological assurance
All regulations, technical means and necessary activities used to ensure the
credibility of measurement results in legal metrology.
9.4 Legal metrological control
All legal measurement activities used for measurement assurance.
Legal metrological control includes:
- Legal control of measuring instruments;
- Metrological supervision;
- Metrological identification.
9.5 Service of legal metrology
Institutions responsible for implementing laws or regulations in the field of legal
Note: The service of legal metrology can be a government agency or other
agencies authorized by the state. Its main task is to implement legal metrology