ISO 16063-33:2017

INTERNATIONAL ISO
STANDARD 16063-33
First edition
2017-10
Methods for the calibration of
vibration and shock transducers —
Part 33:
Testing of magnetic field sensitivity
Méthodes pour l'étalonnage des transducteurs de vibrations et de
chocs —
Partie 33: Essai de sensibilité aux vibrations transversale
Reference number
ISO 16063-33:2017(E)
©
ISO 2017

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ISO 16063-33:2017(E)

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ISO 16063-33:2017(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Uncertainty of measurement . 1
5 Requirements for apparatus . 2
5.1 General . 2
5.2 Magnetic field sensitivity tester . 2
5.3 Conditioning amplifier . 3
5.4 Voltmeter. 4
5.5 Teslameter . 4
6 Ambient conditions . 4
7 Method . 4
7.1 Apparatus setup . 4
7.2 Adjusting test magnetic field . 5
7.3 Mounting transducer . 5
7.4 Test procedure . 5
7.5 Expression of results . 6
Annex A (informative) Automatic test system of magnetic field sensitivity .7
Annex B (informative) Alternative procedure with three orthogonal coils .9
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ISO 16063-33:2017(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
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on the ISO list of patent declarations received (see www.iso.org/patents).
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World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 108, Mechanical vibration, shock
and condition monitoring, Subcommittee SC 3, Use and calibration of vibration and shock measuring
instruments.
This second edition cancels and replaces the first edition (ISO 5347-19:1993), which has been technically
revised.
A list of all the parts in the ISO 16063 series can be found on the ISO website.
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INTERNATIONAL STANDARD ISO 16063-33:2017(E)
Methods for the calibration of vibration and shock
transducers —
Part 33:
Testing of magnetic field sensitivity
1 Scope
This document specifies a method, procedures and the specifications for an apparatus to be used for
testing the magnetic field sensitivity of vibration and shock transducers. It is applicable to all kinds of
vibration and shock transducers.
This document is applicable for a reference test sinusoidal magnetic field having a root mean square
–3 –2
(r.m.s.) value more than 10 T at 50 Hz or 60 Hz. Typically, a test magnetic field of 10 T at 50 Hz or 60
Hz is used.
This document is primarily intended for those who are required to meet internationally standardized
methods for the measurement of magnetic field sensitivity under laboratory conditions.
2
NOTE 1 T (tesla) = 1 Wb/m .
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 16063-1:1998, Methods for the calibration of vibration and shock transducers — Part 1: Basic concepts
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
4 Uncertainty of measurement
Uncertainty of measurements can be expressed as relative expanded uncertainty. If the test signal is big
and the signal-to-noise ratio (SNR) is more than 20 dB, ignoring the influence of the ambient vibration
and apparatus background noise, a relative expanded uncertainty of 10 % (coverage factor k = 2) or less
can be achieved according to this document. However, when the test signal is small and the SNR is not
more than 20 dB, the uncertainty components caused by ambient vibration and apparatus background
noise cannot be ignored. Conversely, it shall be taken into account carefully because it has now become
as a main part of the uncertainty.
All users of this document shall assess and report the uncertainty of measurement according to
ISO 16063-1:1998, Annex A. The uncertainty of measurement is expressed as expanded uncertainty for
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ISO 16063-33:2017(E)

a coverage factor of 2 or a confidence level of 95 %. It is the responsibility of the laboratory or end user
to make sure that the reported values of uncertainty are credible.
5 Requirements for apparatus
5.1 General
This clause gives specifications for the apparatus necessary to comply with this document and notably
to obtain the uncertainties of Clause 4.
5.2 Magnetic field sensitivity tester
The magnetic field sensitivity of the transducer is expressed as the maximum output of the transducer
in a test magnetic field divided by the magnetic flux density of this test magnetic field, see Formula (2).
In order to get the magnetic field sensitivity, S , observe and do the following.
B
— Ensure that the test magnetic field passes through the transducer in all directions.
— Test and obtain all the output data of the transducer from each direction.
— Compare all of these output data and find out the maximum one, that is X .
B,max
— Calculate the magnetic field sensitivity, S , according to Formula (2).
B
An apparatus named “magnetic field sensitivity tester” is specially manufactured for magnetic field
sensitivity testing. The structural schematic diagram of the tester is shown in Figure 1.
1
3
2
4
D 5
RR
6
7
8
9 99
Key
1 rotation axis 7 transducer output
2 bearing 8 vibration isolation system
3 support 9 base
4 two coils D distances between the planes of two coils
5 transducer to be tested R radius of coils
6 test platform
Figure 1 — Structural schematic diagram of a magnetic field sensitivity tester
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ISO 16063-33:2017(E)

The magnetic field sensitivity tester shall meet the following specifications.
a) A pair of coils (two coils) is symmetrically mounted above the test platform. It can be rotated
horizontally around its vertical rotation axis. The distances between the planes of the two coils
shall be equal to their radius (that is, D = R, see Figure 1).
b) The test platform used for mounting the transducer to be tested shall be made of non-ferro-
magnetic material. The transducer can be horizontally mounted on the test platform and shall be at
the centre of the two coils. Furthermore, it shall at least be able to be rotated 180° freely around its
own geometric axis sensitivity, and the mass of the test platform shall be more than 50 times that
of the transducer to be tested.
NOTE 1 The centre of the two coils means the centre of gravity of the two coils.
c) The vibration isolation system is used to reduce the ambient vibration. The eigenfrequency of the
vibration isolation system should be less than 30 Hz.
d) Produce an adjustable alternating current (AC) of 50 Hz or 60 Hz that flows through the two coils
in the same direction and generates a needed test magnetic field.
e) In the area the transducer occupied, the magnetic field shall be within the needed test magnetic
flux density with a relative tolerance of ±3 %.
NOTE 2 Due to the magnetic field generated by two coils being superimposed and compensated for each other,
the magnetic field is uniform near the centre of two coils where the transducer is mounted.
The flux density of the magnetic field in the centre of two coils can be calculated by Formula (1):
2
R
BI=×μ ××N (1)
0
22 15,
(,RD+025 )
where
B is the r.m.s. value of the magnetic flux density of the magnetic field in the centre of the two
coils, in tesla;

−−76
μ
0
is equal to 41π⋅ 01Tm⋅=/A ,257⋅⋅10 Tm/A ;
I is the r.m.s. value of the current, in amperes;
N is the number of turns;
R is the radius of each coil, in metres;
D is the distance between the two planes of the two coils, in metres.
-2
EXAMPLE 1 Two coils: D = R = 150 mm, N = 333. When I = 5,0 A, at the centre of two coils, B = 10 T.
-2
EXAMPLE 2 Two coils: D = R = 250 mm, N = 333. When I = 8,35 A, at the centre of two coils, B = 10 T.
5.3 Conditioning amplifier
The conditioning amplifier shall have a low background noise, with low-pass and high-pass filters used
to cut unwanted signals during the test.
Maximum expanded uncertainty (k= 2): 1 % of gain.
During the measurement operation, a ground loop among the transducer, test platform (see Figure 2),
the amplifier and the read out device should be prevented.
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ISO 16063-33:2017(E)

5.4 Voltmeter
A true r.m.s. voltmeter shall be used.
Maximum expanded uncertainty (k= 2): 1 % of reading.
NOTE Other instruments with the same or smaller uncertainty, such as a signal analyzer, etc., can also be
used in place of a voltmeter.
5.5 Teslameter
A r.m.s. teslameter shall be used.
Maximum expanded uncertainty (k= 2): 2 % of reading.
6 Ambient conditions
Testing shall be carried out under the following conditions:
a) room temperature, (23 ± 5) °C;
b) relative humidity, 75 % max.;
...