IEC 62706:2019

Radiation protection instrumentation - Recommended climatic, electromagnetic and mechanical performance requirements and methods of tests

IEC 62706:2019 recommends the climatic, mechanical and electromagnetic performance requirements and methods of test for radiation protection instrumentation. This document also provides guidance regarding the setup of test equipment and instruments under test (IUT) for certain tests.
The object of this document is to define, for design and test purposes, the environments in which radiation protection instrumentation may be exposed. The environments addressed by this document are applicable to body-worn (e.g., personal radiation detectors, backpack, and dosemeters), handheld, transportable, mobile, and installed instrumentation.
This second edition cancels and replaces the first edition, issued in 2012. This edition includes the following significant technical changes with respect to the previous edition:
a) addition of more details to selected methods of test;
b) revised radio frequency testing requirements based on measurements made at various locations;
c) added equipment and instrument setup guidance and recommendations.

Instrumentation pour la radioprotection - Exigences recommandées en matière de performances climatiques, électromagnétiques et mécaniques et méthodes d'essai

L'IEC 62706:2019 le présent document fournit des recommandations concernant les exigences de performances climatiques, mécaniques et électromagnétiques et les méthodes d'essai pour les instruments de radioprotection. Le présent document fournit également des recommandations concernant la configuration des équipements et instruments soumis à l'essai (IUT), pour certains essais.
L'objectif du présent document est de définir, pour les besoins de la conception et des essais, les environnements dans lesquels peuvent être exposés des instruments de radioprotection. Les environnements traités par le présent document sont applicables aux instruments portés sur le corps (par exemple, détecteurs individuels de rayonnement, dispositifs dorsaux et dosimètres), tenus à la main, transportables, mobiles et installés.
Cette deuxième édition annule et remplace la première édition parue en 2012. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) ajout d'informations supplémentaires à des méthodes d'essai choisies;
b) exigences révisées en matière d'essais de radiofréquence, sur la base de mesures effectuées à divers emplacements;
c) guide et recommandations de configuration concernant les équipements et instruments ajoutés.

General Information

• Status: Published
• Publication Date: 26-Nov-2019
• ICS: 13.280 - Radiation protection
• Technical Committee: SC 45B - Radiation protection instrumentation
• Drafting Committee: MT 18 - TC 45/SC 45B/MT 18
• Current Stage: PPUB - Publication issued
• Start Date: 27-Nov-2019
• Completion Date: 29-Nov-2019

Relations

• Revises: IEC 62706:2012 - Radiation protection instrumentation - Environmental, electromagnetic and mechanical performance requirements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62706 ®
Edition 2.0 2019-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Radiation protection instrumentation – Recommended climatic, electromagnetic
and mechanical performance requirements and methods of tests

Instrumentation pour la radioprotection – Exigences recommandées en matière
de performances climatiques, électromagnétiques et mécaniques et méthodes
d'essai
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IEC 62706 ®
Edition 2.0 2019-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Radiation protection instrumentation – Recommended climatic, electromagnetic

and mechanical performance requirements and methods of tests

Instrumentation pour la radioprotection – Exigences recommandées en matière

de performances climatiques, électromagnétiques et mécaniques et méthodes

d'essai
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.280 ISBN 978-2-8322-7567-2

– 2 – IEC 62706:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions, abbreviated terms and symbols, quantities and units . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms and symbols . 10
3.3 Quantities and units . 10
4 General characteristics and requirements . 11
5 General test procedure . 11
5.1 Nature of tests . 11
5.2 Standard test conditions . 11
5.3 Use of this document . 11
5.3.1 General . 11
5.3.2 Recommendations for influence quantities . 12
5.3.3 Climatic requirements . 12
5.3.4 Mechanical requirements . 12
5.3.5 Electromagnetic requirements . 13
5.3.6 Functionality test . 13
5.3.7 Additional requirements and test methods . 13
6 Radiation detection requirements . 13
7 Climatic requirements . 13
7.1 General . 13
7.2 Ambient temperature. 14
7.2.1 Requirements . 14
7.2.2 Method of test. 14
7.2.3 Setup guidance . 15
7.3 Temperature shock . 15
7.3.1 Requirements . 15
7.3.2 Method of test. 15
7.3.3 Setup guidance . 16
7.4 Low/high temperature start-up . 16
7.4.1 Requirements . 16
7.4.2 Method of test. 16
7.5 Relative humidity . 16
7.5.1 Requirements . 16
7.5.2 Method of test. 16
7.5.3 Setup guidance . 17
7.6 IP (degree of protection) classification . 17
7.6.1 Requirements . 17
7.6.2 Method of test. 17
7.6.3 Setup guidance . 18
7.7 Other environments and long-term installations . 18
7.7.1 Other environments – Guidance . 18
7.7.2 Long-term installations – Guidance . 18

7.7.3 Recommended method of test . 18
8 Mechanical requirements . 19
8.1 General . 19
8.2 Drop . 19
8.2.1 Requirements . 19
8.2.2 Method of test. 19
8.2.3 Setup recommendations . 19
8.3 Vibration test . 20
8.3.1 Requirements for handheld, body-worn, backpack and transportable

instruments . 20
8.3.2 Requirements for installed instruments . 20
8.3.3 Requirements for mobile instruments . 21
8.4 Microphonics/impact . 21
8.4.1 Requirements for handheld and body-worn instruments . 21
8.4.2 Requirements – All others . 21
8.4.3 Method of test. 21
8.4.4 Setup recommendations . 22
8.5 Mechanical shock . 22
8.5.1 Requirements . 22
8.5.2 Method of test. 22
8.5.3 Setup recommendations . 22
9 Electromagnetic requirements . 22
9.1 General setup recommendations . 22
9.2 Electrostatic discharge . 23
9.2.1 Requirements – all instrument types . 23
9.2.2 Method of test. 23
9.2.3 Setup recommendations . 24
9.3 Radio frequency (RF) immunity . 24
9.3.1 Requirements . 24
9.3.2 Setup recommendations . 24
9.3.3 Method of test – body-worn instruments . 25
9.3.4 Method of test – handheld instruments . 25
9.3.5 Method of test – installed instruments . 25
9.4 Radiated emissions . 26
9.4.1 Requirements . 26
9.4.2 Method of test. 26
9.4.3 Setup recommendations . 26
9.5 Magnetic fields . 26
9.5.1 Requirements . 26
9.5.2 Method of test. 27
9.5.3 Setup recommendations . 27
9.6 AC line powered equipment requirements . 27
9.6.1 Voltage and frequency fluctuations . 27
9.6.2 Immunity from conducted RF . 28
9.6.3 Surges and ring waves . 28
10 Documentation . 29
Annex A (informative) Identifying mutually orthogonal (perpendicular) planes . 30
Bibliography . 31

– 4 – IEC 62706:2019 © IEC 2019

Figure A.1 – Cartesian coordinate system . 30

Table 1 – Standard test conditions . 11
Table 2 – Field use temperature and IP requirements . 14
Table 3 – Mechanical requirements. 19
Table 4 – Electromagnetic requirements . 23
Table 5 – Emission frequency range . 26
Table A.1 – Numbered IUT sides and the corresponding Cartesian coordinate
reference . 30

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RADIATION PROTECTION INSTRUMENTATION –
RECOMMENDED CLIMATIC, ELECTROMAGNETIC AND MECHANICAL
PERFORMANCE REQUIREMENTS AND METHODS OF TESTS

FOREWORD
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all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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International Standard IEC 62706 has been prepared by subcommittee 45B: Radiation
protection instrumentation, of IEC technical committee 45: Nuclear instrumentation.
This second edition cancels and replaces the first edition, issued in 2012. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of more details to selected methods of test;
b) revised radio frequency testing requirements based on measurements made at various
locations;
c) added equipment and instrument setup guidance and recommendations.

– 6 – IEC 62706:2019 © IEC 2019
The text of this International Standard is based on the following documents:
FDIS Report on voting
45B/942/FDIS 45B/947/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INTRODUCTION
Radiation protection instrumentation including those instruments used for the detection and
identification of radioactive material and radionuclides are used in many different
environments. They are typically exposed to different temperatures, humidity levels,
electromagnetic fields, and mechanical stresses such as shock and vibration during normal
use. Radiation detection instrumentation may be worn on the body, handheld, mounted to a
vehicle, transported from location to location, or installed. All the conditions associated with
these very different uses are considered when developing instrument-specific requirements.
To ensure consistency between standards, this climatic, electromagnetic, and mechanical
performance requirements standard was established.

– 8 – IEC 62706:2019 © IEC 2019
RADIATION PROTECTION INSTRUMENTATION –
RECOMMENDED CLIMATIC, ELECTROMAGNETIC AND MECHANICAL
PERFORMANCE REQUIREMENTS AND METHODS OF TESTS

1 Scope
This document recommends the climatic, mechanical and electromagnetic performance
requirements and methods of test for radiation protection instrumentation. This document also
provides guidance regarding the setup of test equipment and instruments under test (IUT) for
certain tests.
The object of this document is to define, for design and test purposes, the environments in
which radiation protection instrumentation may be exposed. The environments addressed by
this document are applicable to body-worn (e.g., personal radiation detectors, backpack, and
dosemeters), handheld, transportable, mobile, and installed instrumentation.
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.
IEC 60050-395:2014, International Electrotechnical Vocabulary (IEV) – Part 395: Nuclear
instrumentation – Physical phenomena, basic concepts, instruments, systems, equipment and
detectors
IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60068-2-5, Environmental testing – Part 2-5: Tests – Test S: Simulated solar radiation at
ground level and guidance for solar radiation testing and weathering
IEC 60068-2-14, Environmental testing – Part 2-14: Tests – Test N: Change of temperature
IEC 60068-2-18, Environmental testing – Part 2-18: Tests – Test R and guidance: Water
IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
IEC 60068-2-64, Environmental testing – Part 2-64: Tests – Test Fh: Vibration, broadband
random and guidance
IEC 60068-2-66, Environmental testing – Part 2-66: Test methods – Test Cx: Damp heat,
steady state (unsaturated pressurized vapour)
IEC 60068-2-68, Environmental testing – Part 2-68: Tests – Test L: Dust and sand
IEC 60529, Degrees of protection provided by enclosures (IP code)
IEC 60721-2-7, Classification of environmental conditions – Part 2-7: Environmental
conditions appearing in nature. Fauna and flora

IEC 60721-3-4, Classification of environmental conditions – Part 3-4: Classification of groups
of environmental parameters and their severities – Stationary use at non-weather protected
locations
IEC 60721-3-5, Classification of environmental conditions – Part 3-5: Classification of groups
of environmental parameters and their severities – Section 5: Ground vehicle installations
IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement
techniques – Electrostatic discharge immunity test
IEC 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement
techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-5, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement
techniques – Surge immunity test
IEC 61000-4-6, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measurement
techniques – Immunity to conducted disturbances, induced by radio-frequency fields
IEC 61000-4-8, Electromagnetic compatibility (EMC) – Part 4-8: Testing and measurement
techniques – Power frequency magnetic field immunity test
IEC 61000-4-12, Electromagnetic compatibility (EMC) – Part 4-12: Testing and measurement
techniques – Ring wave immunity test
IEEE/ANSI C63.4, American National Standard for Methods of Measurement of Radio-Noise
Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to
40 GHz
3 Terms and definitions, abbreviated terms and symbols, quantities and units
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-395, as well
as the following apply.
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
3.1.1
body-worn instruments
radiation detection instruments that are worn on the trunk or the extremities of the body while
being used
3.1.2
g
n
standard acceleration due to the earth's gravity, which itself varies with altitude and
geographical latitude
3.1.3
handheld or portable instruments
radiation detection instruments that are used while being held

– 10 – IEC 62706:2019 © IEC 2019
3.1.4
influence quantity
quantity that is not the measurand but that affects the result of the measurement
[SOURCE: ISO/IEC Guide 98-3 (GUM): 2008, B.2.10]
3.1.5
influence quantity of type F
influence quantity whose effect on the indicated value is a change in response
Note 1 to entry: ”F” stands for factor: The indication due to radiation is multiplied by a factor due to the influence
60 137
quantity (e.g., the indication due to Co radiation is 1,2 times that due to Cs radiation).
Note 2 to entry: An example of a type F influence is when an instrument’s response changes as a result of the
radiation energy or angle of radiation incidence.
3.1.6
influence quantity of type S
influence quantity whose effect on the indicated value is a deviation independent of the
indicated value
Note 1 to entry: ”S” stands for sum: The indication is the sum of the indication due to radiation and due to the
influence quantity, e.g., electromagnetic disturbance.
Note 2 to entry: An example of a type S influence includes positive or negative changes in an instrument’s
indication as a result of exposure to an electromagnetic disturbance or microphonic condition.
3.1.7
installed instruments
radiation detection instruments that are permanently mounted at a location for use
3.1.8
transportable instruments
radiation detection instruments that may be moved to different locations and do not operate
while in transit
3.1.9
mobile instruments
radiation detection instruments that are mounted to moving platforms and operate while in
motion
3.2 Abbreviated terms and symbols
CISPR Comité International Spécial des Perturbations Radioélectriques
ESD electrostatic discharge
IUT instrument under test
RF radio frequency
EM electromagnetic
DC direct current
AC alternating current
3.3 Quantities and units
In this document, units of the International System (SI) are used . The definitions of radiation
quantities are given in IEC 60050-395.
___________
th
International Bureau of Weights and Measures: The International System of Units, 8 edition, 2006.

The following units may also be used:
-19
• for energy: electron-volt (symbol: eV), 1 eV = 1,602 x 10 J;
• for time: years (symbol: y), days (symbol: d), hours (symbol: h), minutes (symbol: min):
• for temperature: degrees Celsius (symbol: ºC), 0 ºC = 273,15 K.
-2
• for acceleration: multiples of g (gravity) with g = 9,81 mꞏs
Multiples and submultiples of SI units are used, when practicable, according to the SI system.
4 General characteristics and requirements
This document does not define the general characteristics and requirements for test systems
or devices used to perform individual tests. General requirements are addressed in the
instrument-specific standard.
5 General test procedure
5.1 Nature of tests
This document recommends the climatic, mechanical and electromagnetic performance
requirements and methods of test for radiation protection instrumentation. The tests are
based on existing IEC standards for electronic equipment and field-use experience. This
document also provides guidance regarding IUT set up for individual tests that have been
identified as being complicated to perform.
For a given radiation instrument specific standard, other requirements or those requirements
from other instrument types may be used.
5.2 Standard test conditions
Table 1 contains the standard test conditions. Standard test conditions indicate the necessary
tolerances in practical testing.
Table 1 – Standard test conditions
Influence quantity Standard test conditions
Ambient temperature 18 °C to 25 °C
Relative humidity < 75 %
Atmospheric pressure 86 kPa to 106,6 kPa
Electromagnetic field of external origin Less than the lowest value that causes
interference
Magnetic induction of external origin Less than twice the induction due to the
earth’s magnetic field
5.3 Use of this document
5.3.1 General
This document provides the climatic, electromagnetic and mechanical performance
requirements and methods of tests when developing new or revising existing standards.
These requirements should be established based on the type of instrument (e.g., handheld)
and its expected use (e.g., indoor or outdoor) as defined in 3.1.

– 12 – IEC 62706:2019 © IEC 2019
5.3.2 Recommendations for influence quantities
5.3.2.1 General
Unless stated otherwise, the functional requirements established in an instrument-specific
standard shall be given in terms of change in functionality (e.g., alarm activation, loss of
display, etc.) or indicated reading (e.g., ± 15 % of the average reading obtained in standard
conditions).
The instrument-specific standard should indicate whether an influence quantity usually acts as
type S or F. The radiation level chosen for each test should be based on the type of influence
quantity as described in 5.3.2.2 and 5.3.2.3. In case the type of influence quantity is unknown
(S or F), then tests should be performed according to both types (S and F), i.e., according to
5.3.2.2 and 5.3.2.3.
5.3.2.2 Tests for influence quantities of type S
These tests should be performed at a dose (rate) that is low enough to ensure that an effect
from the test is measurable (e.g., 10 times the lower limit of the effective range of
measurement but not zero in order to be able to detect a reduction in the indication).
5.3.2.3 Tests for influence quantities of type F
For these tests, the dose (rate) chosen should be high enough to ensure that statistical
fluctuations are small enough to demonstrate whether the requirement is met (e.g., at least 10
times above the lower limit of the measuring range).
5.3.3 Climatic requirements
Climatic requirements apply to different types of radiation detection instruments based on
their design and expected use. The climatic requirements that apply to a specific instrument
type are addressed by that instrument-specific standard. As a minimum, ambient temperature
and relative humidity tests should be required for all types of radiation detection instruments.
Other climatic conditions should be established as appropriate for the expected conditions of
use.
The following example text may be used in an individual standard as reference to this
document: "The instrument shall undergo the tests specified in IEC 62706, Clause 7,
concerning the climatic requirements for [insert instrument designation here, i.e., body-worn,
handheld, installed, etc.] instrumentation.” It is advisable not to insert the year of publication
in the normative references citing IEC 62706. Thus, the latest edition of this document will be
considered.
5.3.4 Mechanical requirements
Mechanical requirements apply to different types of radiation detection instruments based on
their design and expected use. The mechanical requirements that apply to a specific
instrument type are addressed by that specific standard. As a minimum, vibration, mechanical
shock, and impact should be required for all types of radiation detection instruments.
The following example text may be used in an individual standard as reference to this
document: "The instrument shall undergo the tests specified in IEC 62706, Clause 8,
concerning the mechanical requirements for [insert instrument designation here, i.e., body-
worn, handheld, installed, etc.] instrumentation.” It is advisable not to insert the year of
publication in the normative references citing IEC 62706. Thus, the latest edition of this
document will be considered.
5.3.5 Electromagnetic requirements
Electromagnetic requirements apply to different types of radiation detection instruments
based on their design and expected use. The electromagnetic requirements that apply to a
specific instrument type are addressed by that specific standard. As a minimum, radio
frequency immunity should be required for all types of radiation detection instruments.
The following example text may be used in an individual standard as reference to this
document: "The instrument shall undergo the tests specified in IEC 62706, Clause 9,
concerning the electromagnetic requirements for [insert instrument designation here, i.e.,
body-worn, handheld, installed, etc.] instrumentation.” It is advisable not to insert the year of
publication in the normative references citing IEC 62706. Thus, the latest edition of this
document will be considered.
5.3.6 Functionality test
A functionality test verifying that the effects from a climatic, electromagnetic, or mechanical
test condition are within the instrument-specific acceptance range shall be defined in the
instrument-specific standard. These tests are generally performed before, during and after
electromagnetic and climatic testing (e.g., temperature and humidity), and before and after
mechanical tests. Appropriate radiation sources specific to the type of IUT should be used.
Functionality tests may include the following verifications:
• Instrument readings are within a specific range before and after exposure to an influence
quantity (e.g., post-test instrument readings are within ± x % of the pre-test value).
• No alarms, radionuclide identifications, increase or decrease in readings, or spurious
indications are observed during exposure to an influence quantity without the presence of
a radiation source.
• The instrument radionuclide identification capabilities are not degraded after exposure to
an influence quantity.
5.3.7 Additional requirements and test methods
Additional or alternative requirements and methods of test may be established as appropriate
for the radiation detection instrument and its expected use.
6 Radiation detection requirements
Radiation detection requirements are addressed in the instrument-specific standard.
7 Climatic requirements
7.1 General
Instruments may consist of multiple components that form a system, e.g., a dosimetry system
includes the reader and individual dosemeters. Individual components may be exposed to
different environments. Selection of climatic requirements shall consider the expected
conditions in which each component will be used. During testing, those components that will
not be exposed to an influence for example, temperature changes, may be separated from the
overall system.
If the instrument can be powered by batteries and AC power, select the method that
represents the manner that the instrument will most likely be powered during use. If the
instrument cannot function on a single battery charge for the duration of the test and can be
powered by AC, use AC power for the test. If the instrument cannot run on AC power, replace
the batteries as needed throughout the test.

– 14 – IEC 62706:2019 © IEC 2019
Some climatic tests require more than one typical work shift. It may be necessary to extend
the climatic tests to allow for measurements to be taken during business hours when the test
personnel are present. It is recommended that only the soak times be extended past the
minimum times specified in the applicable standard. The preferable soak times to extend
would be those closest to nominal temperature, 22 °C.
If an instrument stops functioning during a climatic test, the instrument should be restarted to
see if it recovers. Upon restart, verify the instrument is functional and has been restored to
the original testing configuration.
A summary of the climatic requirements is provided in Table 2.
Table 2 – Field use temperature and IP requirements
Expected environment Temperature IP classification
°C
Installed, weather protected controlled environment +5 to +40 51
Installed, non-weather protected –30 to +55 54
Body-worn –10 to +40 54
Handheld, weather protected controlled environment +5 to +40 51
Handheld, non-weather protected –20 to +50 53
Mobile, non-weather protected –30 to +55 55
Mobile, weather protected –30 to +55 51
Transportable –30 to +55 53
Backpack –20 to +50 53
7.2 Ambient temperature
7.2.1 Requirements
The manufacturer shall state the temperature range over which the instrument and all system
components will operate. Table 2 provides minimal temperature ranges for each instrument
type based on expected usage environments. Instruments may also consist of components to
form a system. In that system, individual components may be exposed to different
environments. Temperature requirements shall be established considering the expected
conditions in which each component will be used.
7.2.2 Method of test
Set up the temperature test system as stated in IEC 60068-2-1 and 60068-2-2, Cold and Dry
heat, respectively.
Before starting the test, the IUT shall be at a temperature of 22 °C ± 2 °C for at least 30 min.
The actual length of time (soak) should be determined based on the mass of the IUT. Heat
generating equipment may never reach thermal equilibrium. Therefore, a minimum time period
for all soak intervals should be provided in the instrument-specific standard. The relative
humidity should be less than 65 % to prevent condensation during testing.
The test shall be performed by ramping the temperature to the high temperature extreme and
then to the low temperature extreme. The temperature shall be linearly changed to the
–1
extreme high temperature at a rate not faster than 10 °C⋅h . The temperature shall be
maintained (soak) at the extreme temperature level for at least 4 h (IUT mass dependent).
Readings or functional changes occurring while the temperature is changing shall be
recorded. The readings (or other functions) of the IUT shall be recorded at the end of the soak

time as defined in the instrument-specific standard. The temperature shall then be reduced
using the same change rate to the low temperature extreme following the same process.
Following low temperature exposure, the temperature shall be returned to 22 °C ± 2 °C at a
–1
controlled rate not exceeding 10 °C⋅h .
7.2.3 Setup guidance
It is recommended that the climatic chamber volume be at least three times the volume of all
IUTs being tested. Due to the size and complexity of some radiation detection systems (e.g.,
large multiple detector contamination monitors), separating the detection components and
other possibly temperature sensitive components is an acceptable practice, when necessary.
Multiple IUTs may be tested simultaneously in the same climatic chamber. IUTs should be
oriented within the chamber to allow necessary access to the IUTs for the purpose of
performing functional testing and to minimize the need for chamber access. If multiple IUTs
are tested simultaneously, it is recommended that they are placed in a manner where they will
all receive the same exposure rate from the radiation source(s). The IUTs should be arranged
so one IUT does not shield another IUT from the radiation source(s).
If cable connections to each IUT are necessary, or if IUTs shall be manually manipulated,
IUTs should be located in close proximity to a chamber access port according to available
cable length or reach. Some IUTs may have displays that require visual verification during
functional testing and, therefore, will need to be monitored by personnel or by video.
Sources may be placed inside the chamber or outside the chamber as long
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