ISO 16063-44:2018

INTERNATIONAL ISO
STANDARD 16063-44
First edition
2018-11
Methods for the calibration of
vibration and shock transducers —
Part 44:
Calibration of field vibration
calibrators
Méthodes pour l'étalonnage des transducteurs de vibrations et de
chocs —
Partie 44: Étalonnage des calibreurs de vibrations pour usage in
situ
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements for apparatus and other conditions . 1
4.1 General . 1
4.2 Reference transducer and amplifier . 2
4.3 Voltage measuring instrument for true RMS transducer chain output . 2
4.4 Frequency measuring instrument . 3
4.5 Distortion measuring instrument . 3
4.6 Dummy mass . 3
4.7 Environmental conditions . 3
5 Calibration procedure . 3
5.1 Preparation of calibration . 3
5.2 Calibration . 4
5.3 Other evaluation (optional) . 4
6 Calculation and expression of the result . 4
6.1 Calculation of the result . 4
6.2 Expression of the result . 5
Annex A (normative) Expression of uncertainty of measurement in calibration .6
Annex B (informative) Configuration and application of field vibration calibrators .8
Bibliography .10
Foreword
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This document was prepared by Technical Committee ISO/TC 108, Mechanical vibration, shock and
condition monitoring.
A list of all the parts in the ISO 16063 series can be found on the ISO website.
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iv © ISO 2018 – All rights reserved

Introduction
ISO 16063 comprises a series of documents dealing with methods for the calibration of vibration and
shock transducers.
This document focuses on field vibration calibrators (FVCs). In this context, FVCs are mainly used for
in situ checks of vibration and shock transducers providing sine wave vibration at known frequency
and magnitude under field conditions. The FVC acts as a calibrated vibration source for in situ checks of
transducer sensitivity that is specified or requested, for example, in ISO 8041-1 or in ISO 8042.
Operational frequency and acceleration RMS value of FVCs are usually 160 Hz or 159,2 Hz, and 3,16 m/
2 2 2
s , 9,81 m/s or 10 m/s , respectively, which are widely accepted as reference conditions. There are
also FVCs with selectable acceleration magnitudes and frequencies. In comparison with stationary
calibration systems, FVCs have limitations in shaker power and inertial mass. Therefore, they can be
unsuitable for heavy test objects, high acceleration magnitudes and large displacements.
Using the calibration procedure described by this document, the acceleration generated by an FVC
can be traceable, through chain of calibration, to a primary or national standard as defined by ISO/
IEC Guide 99 (“the VIM”) with associated uncertainty defined by ISO/IEC Guide 98-3 (“the GUM”).
INTERNATIONAL STANDARD ISO 16063-44:2018(E)
Methods for the calibration of vibration and shock
transducers —
Part 44:
Calibration of field vibration calibrators
1 Scope
This document specifies the instrumentation and procedure to be used for performing calibration of
field vibration calibrators (FVCs).
It is not applicable to FVCs used for the calibration of transducers. These are covered by ISO 16063-21.
Procedures and requirements of in situ calibration by FVC are beyond the scope of this document.
Annex B provides more information on the application of FVC.
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 2041, Mechanical vibration, shock and condition monitoring — Vocabulary
ISO 16063-21, Methods for the calibration of vibration and shock transducers — Part 21: Vibration
calibration by comparison to a reference transducer
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2041 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
4 Requirements for apparatus and other conditions
4.1 General
Figure 1 shows the apparatus for the calibration. In some cases, reference transducer and amplifier
may be a single device as transducer chain.
Key
1 FVC
2 dummy mass
3 reference transducer
4 amplifier
5 distortion meter
6 voltmeter
7 frequency counter
8 fixing attachment (only for hand-held FVCs)
9 base
Figure 1 — Calibration apparatus
4.2 Reference transducer and amplifier
The reference transducer (preferably together with amplifier) shall be calibrated in accordance with
the comparison method given in ISO 16063-21 or other known methods with expanded uncertainty
of less than 2 % (magnitude). The uncertainty is the expanded uncertainty using a coverage factor of
2. When the FVC allows selectable acceleration magnitudes and frequencies, the reference transducer
shall be calibrated at each magnitude and frequency in advance.
The reference transducer shall have a low transverse sensitivity of preferably less than 2 % to minimize
the influence of the FVC's transverse vibration. The mass of the reference transducer shall be equal to,
or smaller than the capability of the FVC to be tested. Additional mass (dummy mass) may be employed
for evaluation of acceleration, distortion and other performances of the FVC.
4.3 Voltage measuring instrument for true RMS transducer chain output
A voltmeter measuring true RMS at the reference transducer chain output is used. Required expanded
uncertainty of voltmeter is 0,3 % at the selected reference frequency (coverage factor of 2).
2 © ISO 2018 – All rights reserved

4.4 Frequency measuring instrument
A frequency counter at the reference transducer chain output is used. Required expanded uncertainty
is 0,05 % at the selected reference frequency (coverage factor of 2).
4.5 Distortion measuring instrument
th
A distortion meter or an FFT analyser for total distortion
...