SIST EN ISO 8041:2005/prA1:2015
(Amendment)Human response to vibration - Measuring instrumentation - Amendment 1 (ISO 8041:2005/DAM 1:2015)
Human response to vibration - Measuring instrumentation - Amendment 1 (ISO 8041:2005/DAM 1:2015)
2016-01-21: WI stopped to follow ISO decision - revision started (see WI 00231111).
Schwingungseinwirkung auf den Menschen - Messeinrichtung - Änderung 1 (ISO 8041:2005/DAM 1:2015)
Réponse des individus aux vibrations - Appareillage de mesure - Amendement 1 (ISO 8041:2005/DAM 1:2015)
Odzivanje človeka na vibracije - Merilni instrumentarij - Dopolnilo A1 (ISO 8041:2005/DAM 1:2015)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 8041:2005/prA1:2015
01-julij-2015
2G]LYDQMHþORYHNDQDYLEUDFLMH0HULOQLLQVWUXPHQWDULM'RSROQLOR$ ,62
'$0
Human response to vibration - Measuring instrumentation - Amendment 1 (ISO
8041:2005/DAM 1:2015)
Schwingungseinwirkung auf den Menschen - Messeinrichtung - Änderung 1 (ISO
8041:2005/DAM 1:2015)
Réponse des individus aux vibrations - Appareillage de mesure - Amendement 1 (ISO
8041:2005/DAM 1:2015)
Ta slovenski standard je istoveten z: EN ISO 8041:2005/prA1:2015
ICS:
13.160 Vpliv vibracij in udarcev na Vibration and shock with
ljudi respect to human beings
SIST EN ISO 8041:2005/prA1:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 8041:2005/prA1:2015
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SIST EN ISO 8041:2005/prA1:2015
DRAFT INTERNATIONAL STANDARD
ISO/DIS 8041
ISO/TC 108/SC 3 Secretariat: DS
Voting begins on: Voting terminates on:
2015-04-02 2015-07-02
Human response to vibration — Measuring
instrumentation
AMENDMENT 1
Réponse des individus aux vibrations — Appareillage de mesure
AMENDEMENT 1
ICS: 13.160
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for
Standardization (ISO), and processed under the ISO lead mode of collaboration
as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments
received, will be submitted to a parallel two-month approval vote in ISO and
THIS DOCUMENT IS A DRAFT CIRCULATED
formal vote in CEN.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 8041:2015(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2015
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SIST EN ISO 8041:2005/prA1:2015
ISO/DIS 8041:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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ii © ISO 2015 – All rights reserved
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SIST EN ISO 8041:2005/prA1:2015
ISO/DIS 8041:2015(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
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
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 any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 108, Mechanical vibration, shock and condition
monitoring, Subcommittee SC 3, Use and calibration of vibration and shock measuring instruments.
Page v, fifth indent
Add after pattern evaluation “or validation”.
Page vi
Add the following Introduction:
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SIST EN ISO 8041:2005/prA1:2015
ISO/DIS 8041:2015(E)
Human response to vibration — Measuring
instrumentation
AMENDMENT 1
Introduction
Up to 2005, when this International Standard was published, measuring instrumentation for
human response to vibration (vibration meters) normally consisted of a signal processing unit and
a detachable vibration transducer. According to recent developments, however, part of the signal
processing steps can be integrated in the transducer unit, so that the signal coming out of the
transducer’s sensing element and going into the signal conditioning unit is not accessible any more.
These transducer units include e.g. IEPE and MEMS transducers.
Some of the test procedures specified in this International Standard, however, presume that this point in
the signal path is accessible (electrical input). Since such an input is not mandatory these tests can only
be performed on a vibration meter having an electrical input or after some technical modifications to
the instrumentation, e.g. internal access to signals. Or those tests can only be performed mechanically,
which in certain cases requires modifications to some test procedures. Such modifications to test
procedures, however, are beyond the present scope of this International Standard.
Some of the test procedures specified in this International Standard can only be performed if an
electrical output is available, e.g. 5.13. Since such an output is not mandatory these tests can only be
performed on a vibration meter having an electrical output or after some technical modifications to
the instrumentation, e.g. internal access to signals.
The verification test specified in this Amendment is practicable and has the objective of identifying
an instrument which is adequately calibrated for the intended applications and is suitable for the
purpose, at a cost reasonable for the calibration laboratory and affordable for the end user. Therefore
the verification test is strongly reduced in its extend compared to the full pattern evaluation or
validation and does only test the most relevant characteristcs of a vibration meter.
Page 1, Clause 1, first paragraph
Add after pattern evaluation “or validation”.
Renumber a) to be a1) and add the following:
a2) validation of one-off instruments, i.e. a limited set of tests of an individual vibration measuring
system against the relevant specifications defined in this International Standard;
Page 4, 3.1.5.7
Replace Formula (7) by the following:
222 2 2 2
ak=+ak ak+ a (7)
v xxw yyw zzw
Page 6, Figure 1
Replace in the figure capture “Overview” by “Example”.
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SIST EN ISO 8041:2005/prA1:2015
ISO/DIS 8041:2015(E)
Page 7 and 8, 5.1
Add after the first and the third indent, respectively, the following symbols:
a
w
T
Page 17, 5.10, fifth paragraph, fifth line
Replace “a further” by “at least”.
Page 17, 5.10
Add at the end of the subclause the following Note:
NOTE — It is useful that the vibration meter is capable of indicating how long (in relation to the
measurement duration) in each channel an overload took place.
Page 19, 5.16
Add at the end of the subclause the following Note:
NOTE — This electrical cross-talk between measurement channels should be distinguished
from transducer transverse sensitivity which typically is greater than 0,5 %, see Clause E.2. The
transverse sensitivity can become relevant especially with multi-axial transducers.
Page 23, Clause 11
Replace a) by the following:
a1) Pattern evaluation (targeted at manufacturers) is a full set of tests to be performed on samples of
an instrument type. This test is used for product type testing or pattern approval of a production
series of vibration measuring instruments. The objective of this test is to demonstrate an instrument
design can meet the specifications defined in this International Standard;
a2) Validation of one-off instruments (targeted at laboratory users or research users) is a limited set
of tests to demonstrate that an individual vibration measuring system complies with the relevant
specifications defined in this International Standard;
Replace in b), first indent, “every 1 or” by “at least every”.
Delete in b) the second indent.
Add in b) in the last indent after modification “(e.g. use of another transducer)”.
Page 24, Table 13
Replace the table by the following:
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SIST EN ISO 8041:2005/prA1:2015
ISO/DIS 8041:2015(E)
Table 13 — Summary of performance characteristics and test requirements
Specification Test type Test clause
Pattern
Validation
evaluation Periodic
Mechani- (one-off In-situ
Clause Characteristic Electrical (pro- verifica-
cal instru- check
duction tion
ments)
series)
5.1 General characteristics 12.5, 12.6 13.6, 13.7 14.5 15.2
Display of signal magni-
5.2 12.5 13.6
tude
5.3 Electrical output • 12.17
5.4 Vibration sensitivity • 12.7 13.9, 13.11 14.9 15.3
Accuracy of indication at
5.5 reference frequency under • 12.7 13.9
reference conditions
Frequency weightings and 12.11
5.6 • • 13.11 14.9
frequency responses Annex H
5.7 Amplitude linearity • • 12.10 13.11 14.9
5.8 Instrument noise • 12.12 13.12
5.9 Signal-burst response • 12.13
5.10 Overload indication • 12.14 13.14
5.11 Under-range indication • • 12.10
5.12 Time averaging • 12.13
Running r.m.s. accelera-
5.13 • 12.13
tion
5.14 Reset 12.15
5.15 Timing facilities 12.18 13.15
5.16 Electrical cross-talk • 12.8 13.13
5.2 Combined axis outputs • 12.16
5.17 Vibration transducer
• 12.9
(Annex E) characteristics
5.18 Power supply 12.19
6 Mounting Annex F
Environmental and elec-
7 12.20
tromagnetic criteria
Provision for use with
8 • 12.5,12.17
auxiliary devices
9 Instrument marking 12.4 13.5 14.6
Instrument documenta-
10 12.4 13.5 14.6
tion
Page 25, 12.3
Add the following second and third paragraphs:
The instrument shall be submitted for testing with equipment (e.g. adaptors) suitable for enabling the
input and output of electrical signals.
A vibration calibrator should be supplied with the vibration instrument.
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SIST EN ISO 8041:2005/prA1:2015
ISO/DIS 8041:2015(E)
Page 26, 12.6, first paragraph
Replace the second sentence by “The instrument, transducer and the vibration calibrator (if supplied)
shall be visually inspected and all controls operated to ensure they are in working order.”
Page 26, 12.7
Replace the third paragraph by the following:
The reference vibration transducer shall be used to measure the value of the mechanical vibration
input generated at the reference vibration value and at the reference frequency, before measuring the
vibration magnitude with the vibration meter. For these measurements, the vibration meter shall be set
to the reference measurement range, band-limiting frequency-weighting and linear time averaging and
with a measurement duration sufficient for the indicated values to stabilize (for low-frequency testing,
this duration can be as much as 30 s for hand-arm vibration, 1 min for whole-body, and 5 min for low-
frequency whole-body applications). The value of the input signal plus background noise shall be at least
10 times the value of the background noise as measured by the vibration meter.
Page 28, 12.10.1, third paragraph from top of page
Add in the first sentence after specified lower boundary “[see G.2 j)]”.
Page 28, 12.10.2, first paragraph
Replace the last sentence by “The vibration transducers shall be mounted in accordance with the
calibration procedure specified in ISO 16063-21.”
Page 29, 12.10.2, paragraph in between the six indents
Replace “from the signal value that caused the first indication of overload” by “from that maximum
signal value”.
Page 29, 12.10.2, last but two paragraph
Replace “until the first indication of overload” by “until the maximum signal value specified above”.
Page 29, 12.10.2, last paragraph
Delete “and until the first indications of overload”.
Page 30, 12.11.2, first paragraph
Replace the last sentence by “The vibration transducers shall be mounted in accordance with the
calibration procedure specified in ISO 16063-21.”
Page 30, 12.11.2
Replace the second paragraph by the following:
At the reference frequency, the input mechanical vibration shall be adjusted such that the indication
of band-limited vibration on the instrument under test is 20 dB above the lower limit of the specified
, shall be used as a
linearity range. The band-limited acceleration value of this input signal, a
in
reference input value for subsequent tests.
Page 31, 12.11.3
Replace the second paragraph by the following:
At the reference frequency f , the input electrical signal shall be adjusted such that the indication
ref
of band-limited vibration on the instrument under test is 20 dB above the lower limit of the specified
linearity range. The indicated frequency-weighted value, a , of this input signal shall be used as a
ind
reference value for subsequent tests.
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ISO/DIS 8041:2015(E)
Page 38, Clause 13
Replace the clause by the following:
13 Validation of one-off instruments
13.1 Introduction
A one-off vibration measurement system, shortly called one-off instrument, is a system for measurement
of vibration that is a combination of separate components (e.g. transducer, signal amplifier, A/D
converter, data acquisition system, frequency analyser, software). For each component, data sheets and
specifications need to be available. The whole system shall be validated according to the specifications
in this clause to demonstrate its designed functionality. One-off instruments are often laboratory
based, made up from general-purpose laboratory instrumentation. One-off instruments do not include
prototypes of measurement systems intended for production.
Compliance to a specification of this International Standard is demonstrated when the result of a
measurement of a deviation from a design goal, extended by the actual expanded measurement
uncertainty of the testing laboratory, does not exceed the specified tolerance limits.
Measurement uncertainties shall be determined in accordance with the GUM. The actual expanded
uncertainties shall be calculated by the testing laboratory, with the coverage factor k = 2.
The validation test comprises calibration of the one-off instrument (as is generally commissioned by the
end user of the one-off instrument) by a testing laboratory (calibration laboratory).
13.2 Testing requirements
Those testing instruments used for validation testing which affect the uncertainty of test outputs shall
hold valid calibrations, traceable to national standards.
The frequency of the input signals shall be within ± 0,2 % of the required value.
The magnitude of mechanical input signals shall be within ± 3 % of the required value.
The total distortion for sinusoidal electrical test inputs shall be not greater than 0,1 %.
The total distortion for sinusoidal mechanical vibration test inputs shall be not greater than 5 %.
NOTE — For electrodynamic shakers acting below 20 Hz, the total distortion is likely to be
greater than 5 %.
The environmental conditions prevailing at the time of a test shall be within the following ranges:
— air temperature: 19 °C to 27 °C,
— relative humidity: ≤ 90 % (non-condensing).
13.3 Test object
Test object is a one-off instrument with vibration transducer(s) forming a measurement chain for
the measurement and display of band-limited and frequency-weighted accelerations according to the
frequency weightings W , W , W , W , W , W , W or W .
b c d f h j k m
NOTE — The vibration transducer(s) may be a 3-axis (tri-axial) accelerometer or any 1-axis
accelerometers.
Unless otherwise stated, all tests specified in this clause apply to each channel of a multi-channel one-
off instrument.
Where a component documentation specifies batteries of a particular model and type, such batteries
shall be installed.
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SIST EN ISO 8041:2005/prA1:2015
ISO/DIS 8041:2015(E)
13.4 Submission for testing
A vibration transducer of a type intended for use with the one-off instrument shall be supplied with
the instrument.
Vibration transducers other than that provided for testing may be used with the one-off instrument,
provided that the specification of those other vibration transducers is similar to that supplied for testing.
The one-off instrument shall be submitted for testing with equipment (e.g. adaptors) suitable for
enabling the input and output of electrical signals.
A vibration calibrator should be supplied with the one-off instrument.
13.5 Marking of the one-off instrument and information in the instrument documentation
It shall be confirmed that the one-off instrument is marked according to the specifications of Clause 9.
Before conducting any tests, it shall be confirmed that the one-off instrument documentation contains all
the information required by Clause 10, appropriate to the facilities provided by the one-off instrument.
After completion of all tests, the information shall be reviewed to ensure that it is correct and within the
appropriate tolerance limits.
13.6 Mandatory facilities and general requirements
The one-off instrument shall be confirmed to conform to the requirements of 5.1.
For one-off instruments with multiple measurement ranges, it shall be confirmed that the measurement
range overlap conforms to the specifications of 5.7.
The display shall be confirmed to conform to the specifications of 5.2.
13.7 Initial instrument preparation
The one-off instrument, transducer and the vibration calibrator (if supplied) shall be visually inspected
and all controls operated to ensure they are in working order.
The procedure given in the one-off instrument documentation shall be followed to set the vibration
sensitivity of the one-off instrument at the calibration check frequency. Any adjustments required by
5.4 and given in the one-off instrument documentation shall be applied to adjust the sensitivity of the
one-off instrument to display the correct vibration value under reference environmental conditions.
13.8 Test procedure
For the following three typical applications, test procedures and parameters are specified which
comprise only those tests of the one-off instrument which are relevant to the application concerned:
a) vibration measurement chain for hand-arm vibration;
b) vibration measurement chain for whole-body vibration;
c) vibration measurement chain for low-frequency whole-body vibration.
NOTE — No validation test is specified for one-off instruments measuring rotational whole-
body vibration.
These test procedures comprise the mechanical test of the combination of accelerometer and instrument,
constituting a measurement chain which is set to the appropriate weighting filter(s). The validity of the
validation test as stated on the calibration certificate is therefore limited to the application for which
testing was performed.
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SIST EN ISO 8041:2005/prA1:2015
ISO/DIS 8041:2015(E)
Where necessary, the end user can also commission testing of system configurations which differ
from the typical configurations. The objective in all cases, however, is a calibration and test only of the
measurement chain configuration which is actually used by the end user.
Each test procedure comprises mechanical calibration of the measurement chain with sinusoidal signals
of defined amplitude and frequency. These test parameters are specified in 13.10. From the measurement
results, the following is derived:
— vibration sensitivity of the measurement chain,
— the amplitude linearity (or any deviation) at discrete input values,
— the frequency response at discrete frequencies,
— instrument noise.
Additional electrical tests yield results for the following characteristics:
— electrical cross talk,
— overload,
— timing facilities.
13.9 Indication at the reference frequency under reference conditions
The error in the indication of the reference acceleration value at the reference frequency (see Table 1)
shall be determined from the difference between the vibration value displayed by the one-off instrument
and the corresponding vibration value measured by an appropriately calibrated reference vibration
transducer at the same measurement point.
The error ε of the test measurement a is expressed as a percentage of the reference vibration
test
transducer measurement a , i.e.:
ref
aa−
test ref
ε = ×100% (21)
a
ref
NOTE — The error ε is a relative measure, i.e. a relative error expressed as percentage.
The reference vibration transducer shall be used to measure the value of the mechanical vibration input
generated at the reference vibration value and at the reference frequency, before measuring the vibration
magnitude with the one-off instrument. For these measurements, the one-off instrument shall be set to
the reference measurement range, band-limiting frequency-weighting and linear time averaging and
with a measurement duration sufficient for the indicated values to stabilize (for low-frequency testing,
this duration can be as much as 30 s for hand-arm vibration, 1 min for whole-body, and 5 min for low-
frequency whole-body applications). The value of the input signal plus background noise shall be at least
10 times the value of the background noise as measured by the one-off instrument.
A minimum of three measurements of error of indication shall be obtained. For each measurement, a time
interval not less than that stated in the one-off instrument documentation for the instrument’s settling
time shall be allowed for the one-off instrument to reach equilibrium with the prevailing environmental
conditions before any indication is recorded. The difference between the greatest and the smallest of
the three measurements shall not exceed 3 %.
The arithmetic average of the error of indication measurements shall be within the applicable tolerance
limits of Table 2. The maximum expanded measurement uncertainties are 2 %.
For each frequency weighting provided, a steady sinusoidal electrical signal shall be applied to the
electrical input facility at the appropriate reference frequency. With an input signal adjusted to indicate
the reference vibration value on the reference measurement range with band-limiting frequency
weighting, the indicated frequency-weighted vibration values shall equal the indicated band-limited
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SIST EN ISO 8041:2005/prA1:2015
ISO/DIS 8041:2015(E)
weighted vibration value multiplied by the appropriate weighting factor (see Table 1) within the
tolerance limits of Table 2. The maximum expanded measurement uncertainties are 2 %.
For an one-off instrument where time weightings are provided, a steady sinusoidal electrical signal shall
be applied to the electrical input facility at the reference frequency. The amplitude of the input signal
shall be adjusted to give an indication of the reference vibration value on the reference measurement
range with the one-off instrument set to band-limiting frequency weighting. With the same input signal,
the indicated vibration values on each time weighting shall equal the indicated reference vibration value
within the tolerance limits of Table 2. The maximum expanded measurement uncertainties are 2 %.
13.10 Test parameters
13.10.1 Vibration measurement chain for hand-arm vibration
Frequency weighting: W
h
Reference frequency: 79,58 Hz
2
Reference acceleration: 10,0 m/s
2 2
Unweighted input amplitude range 5 m/s to 100 m/s at 79,58 Hz
for mechanical amplitude linearity
test:
2
Unweighted input amplitude values: (5; 7,5; 10; 25; 50; 75; 100) m/s
2
Frequency range for frequency 5 Hz to 1000 Hz at 10,0 m/s
response:
Exact frequencies: (5,012; 6,310; 7,943; 10; 15,85; 31,62; 63,10; 79,43; 125,9; 251,2;
501,2; 794,3; 1000) Hz
In any case it shall be ensured that the input value is at least 20 dB above the noise floor. If necessary the
shaker acceleration may be increased. Distortion generated by the shaker shall be minimized. Overload
of the shaker shall not occur.
13.10.2 Vibration measurement chain for whole-body vibration
Frequency weightings: W W W W W W
b, c, d, j, k, m
Reference frequency: 15,915 Hz
2
Reference acceleration: 1,00 m/s
2 2
Unweighted input amplitude range for 0,1 m/s to 50 m/s at 15,915 Hz
mechanical amplitude linearity test:
2
Unweighted input amplitude values: (0,1; 0,25; 0,5; 0,75; 1; 2,5; 5; 7,5; 10; 25; 50) m/s
2
Frequency range for frequency response: 0,63 Hz to 125 Hz at 1,00 m/s
Exact frequencies: (0,631; 1; 1,259; 1,995; 3,981; 7,943; 15,85; 31,62;
63,10; 79,43; 125,9) Hz
In any case it shall be ensured that the input value is at least 20 dB above the noise floor. If necessary the
shaker acceleration may be increased. Distortion generated by the shaker shall be minimized. Overload
of the shaker shall not occur.
13.10.3 Vibration measurement chain low-frequency whole-body vibration
Frequency weighting: W
f
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SIST EN ISO 8041:2005/prA1:2015
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Reference frequency: 0,3979 Hz
2
Reference acceleration: 0,1 m/s
2 2
Unweighted input amplitude range for mechanical0 ,01 m/s to 1 m/s at 0,3979 Hz
amplitude linearity test:
2
Unweighted input amplitude values: (0,01; 0,025; 0,05; 0,075; 0,1; 0,25; 0,5; 0,75; 1) m/s
2
Frequency range for frequency response: 0,1 Hz to 0,5 Hz at 0,1 m/s
Exact frequencies: (0,1; 0,1259; 0,1995; 0,3981; 0,5012) Hz
In any case it shall be ensured that the input value is at least 20 dB above the noise floor. If necessary the
shaker acceleration may be increased. Distortion generated by the shaker shall be minimized. Overload
of the shaker shall not occur.
13.11 Conducting the test
Before conducting any tests, the one-off instrument shall be given a power supply within the operating
limits specified by the component manufacturer(s).
The complete mechanical tests are performed by three separate tests:
— adjustment of vibration sensitivity at the reference frequency and reference acceleration,
— measurement of amplitude linearity response at the reference frequency and
— measurement of frequency response with a constant input vibration magnitude (within the limits
of the testing equipment).
The transducer shall be connected in the best way to the mounting surface of the shaker. Care shall be
taken to avoid that the fixing attachment affects the frequency response at high frequencies.
A system for calibration by comparison in accordance with ISO 16063-21 should be used. The system
shall be capable to adjust the defined amplitudes which shall be constant over the measurement time.
The measurements shall be performed using the complete one-off instrument which usually consists of
a transducer (accelerometer), cable, A/D converter and acquisition system.
For the weighting filter selected, the vibration sensitivity of the one-off instrument at the reference
frequency and reference acceleration shall be determined in each channel and then adjusted.
For the measurement of amplitude linearity response at the reference frequency within one measurement
at the display shall be docum
...
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