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GB/T 29476-2012 PDF in English


GB/T 29476-2012 (GB/T29476-2012, GBT 29476-2012, GBT29476-2012)
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GB/T 29476-2012: PDF in English (GBT 29476-2012)

GB/T 29476-2012
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.020; 17.020
N 50
General technical specification for mobile laboratory
instruments and equipment
ISSUED ON: DECEMBER 31, 2012
IMPLEMENTED ON: JULY 31, 2013
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions... 5 
4 Classification ... 6 
5 Requirements ... 7 
6 Test methods ... 10 
Bibliography... 14 
General technical specification for mobile laboratory
instruments and equipment
1 Scope
This Standard specifies the terms and definitions, classification, technical requirements,
test methods for mobile laboratory instruments and equipment.
This Standard applies to mobile laboratory testing, calibration or scientific experiment
instruments and their auxiliary equipment used on land.
2 Normative references
The following referenced documents are indispensable for the application 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.
GB/T 2423.1, Environmental testing for electric and electronic products - Part 2:
Test methods - Tests A: Cold
GB/T 2423.2, Environmental testing for electric and electronic products - Part 2:
Test methods - Tests B: Dry heat
GB/T 2423.3, Environmental testing for electric and electronic products - Part 2:
Testing method - Test Cab: Damp heat, steady state
GB/T 2423.5, Environmental testing - Part 2: Test methods - Test Ea and guidance:
Shock
GB/T 2423.8, Environmental testing for electric and electronic products - Part 2:
Test methods - Test Ed: Free fall
GB/T 2423.17, Environmental testing for electric and electronic products - Part 2:
Test method - Test Ka: Salt mist
GB/T 2423.21, Environmental testing - Part 2: Test methods - Test M: Low air
pressure
GB/T 2423.56, Environmental testing - Part 2: Test methods - Test Fh: Vibration,
broadband random and guidance
GB 4793.1-2007, Safety requirements for electrical equipment for measurement,
control, and laboratory use - Part 1: General requirements
GB/T 18268.1-2010, Electrical equipment for measurement, control and laboratory
use - EMC requirements - Part 1: General requirements
GB/T 29479, General requirements of mobile laboratory
QC/T 252, Type test regulations for special automobile
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 29479 as
well as the followings apply. For ease of use, some terms and definitions in GB/T 29479
are repeated below.
3.1 mobile laboratory
a laboratory that meets specific purposes and requirements and is composed of complete
sets of devices to carry out activities such as testing, calibration or scientific
experiments in mobile facilities and environments
[GB/T 29479, definition 3.1]
3.2 mobile laboratory shelter
the cabin that is used to carry mobile laboratory experimenters, testing equipment,
calibration equipment and related professional facilities, and can provide a suitable
operating environment for normal activities such as testing, calibration or scientific
experiments
[GB/T 29479, definition 3.3]
3.3 instruments & equipment for mobile laboratory
the instruments and their auxiliary equipment that are installed, carried and stored in
mobile laboratories for testing, calibration or scientific experiments
3.4 mobile feature of instruments & equipment
the instruments and equipment meet the guaranteed requirements of the mobile
characteristics of the mobile laboratory, including the functional requirements to meet
the needs of testing, calibration or scientific experiments under mobile conditions, and
the adaptability of environmental conditions to resist or withstand changes in
environmental conditions as well as specifications and interface compatibility to meet
mobile lab design requirements
3.5 fixation
5 Requirements
5.1 General requirements
5.1.1 Power supply
The instruments and equipment shall be equipped with two or more power interfaces
or conversion adapters of different types of voltages, such as AC 220V, DC 24V or DC
12V. The instruments and equipment using DC power supply shall also have positive
and negative anti-mistake measures or operation warning signs. The battery life of
instruments and equipment powered by their own power supply shall not be less than
4h.
5.1.2 Interface compatibility
If the instruments and equipment have input and output requirements such as water
supply, gas supply, and data transmission, their input and output interfaces shall match
those of the experimental cabin. Or provide conversion adapters that meet the universal
design requirements of mobile laboratories.
5.1.3 Shockproof
The instruments and equipment shall be installed firmly and reliably. Fixed installation
of instruments and equipment shall be designed with at least 2 installation points at the
bottom or side. Non-fixedly installed instruments and equipment shall be equipped with
special packaging or other protective devices to prevent damage or performance
degradation of instruments and equipment during transportation and use. If necessary,
the whole machine or components shall be designed for vibration isolation or buffering,
or the corresponding level of shock absorption device shall be used.
5.1.4 Supportability
The instruments and equipment shall have the function of fault alarm and automatic
diagnosis. Necessary tools and spare parts shall be provided to ensure that the
instruments and equipment can be quickly restored to working condition after on-site
maintenance.
5.1.5 Quick recovery
The recovery time of equipment during or after movement shall not exceed the fixed
recovery time.
5.1.6 Additional influence quantity
The additional influence quantity of the instruments and equipment during and after the
movement shall be completely eliminated or reduced to within the maximum allowable
error range of the equipment.
5.1.7 Reliability
Under the specified environmental conditions, the average failure mileage of the
instruments and equipment shall not be less than 3000km.
5.1.8 Identification
The instruments and equipment shall be marked with the parameters of the working
environment in the obvious position of the product. Parameter indicators shall include:
recovery time (h), operating temperature range (°C), relative humidity range (%),
random vibration acceleration spectral density (m2/s3), drop height (mm), impact
acceleration (m/s2).
5.2 Environmental adaptability
5.2.1 Temperature
The instruments and equipment shall at least ensure that the temperature environment
works normally within the range of 10°C~35°C, and is transported and stored within
the range of -40°C~55°C.
5.2.2 Humidity
The instruments and equipment shall be guaranteed to work normally in an environment
with a relative humidity of not higher than 80% and can be stored normally in an
environment of not higher than 93%.
5.2.3 Low air pressure
The instruments and equipment shall be adapted to low-pressure environmental
conditions at different altitudes. At least it shall be guaranteed to work normally in an
environment where the air pressure value is not higher than 84kPa.
5.2.4 Salt spray
For the instruments and equipment used in coastal areas or in a salt spray environment,
at least it shall be guaranteed to work normally in a salt spray environment with a
concentration of (5±0.1)%.
5.3 Transport resistance
5.3.1 Random vibration
The instruments and equipment shall at least be guaranteed to work, transport and store
normally in a random vibration environment with a frequency range of (5~500) Hz and
an acceleration spectral density of 0.05m2/s3.
5.3.2 Impact
6.2.4 Salt spray
The salt spray test is carried out according to the method specified in GB/T 2423.17.
6.3 Transport resistance
6.3.1 Random vibration
The instruments and equipment working in the mobile state shall generally be in the
working state during the test. The instruments and equipment that work after the
movement stops and resumes are generally in a non-working state during the test. The
random vibration test shall be tested according to the method specified in GB/T 2423.56.
6.3.2 Impact
The impact test is carried out according to the method specified in GB/T 2423.5.
6.3.3 Drop
The drop test is carried out according to the method specified in GB/T 2423.8.
6.4 Electromagnetic compatibility
6.4.1 Immunity
The electromagnetic compatibility immunity test shall be tested according to the
method specified in the basic standard in Table 1 of 6.2 of GB/T 18268.1-2010. The
performance criterion can refer to the method specified in 6.4 of GB/T 18268.1-2010.
6.4.2 Emission
The electromagnetic compatibility emission test shall be tested according to the method
specified in 7.2 of GB/T 18268.1-2010.
6.5 Safety
6.5.1 Warning marks
Use a cloth dampened with the prescribed cleaner (if not specified, then with isopropyl
alcohol). Wipe with hands for 30s without undue pressure.
6.5.2 Dielectric strength
6.5.2.1 Before the test, the instruments and equipment need to be pretreated with
moisture. The instruments and equipment shall be placed in a test box with a relative
humidity of 92.5%±2.5% and a temperature of 40°C±2°C for 48h. Test after 2h
recovery at room temperature. The test shall be completed within 1h after recovery.
6.5.2.2 The power plug of the instrument is not connected to the power grid. The power
switch is in the ON position. Cut off the output of the withstand voltage tester. The
current is placed in the appropriate gear. One end of the voltage output terminal of the
withstand voltage tester is connected to the neutral wire and the live wire of the power
supply. The other end is connected to accessible conductive parts. During the test, the
voltage shall be gradually increased to the specified value at 5s or within 5s. So that
there is no obvious jump in the voltage, and then keep it for 5s.
6.5.3 Contact current
Connect the power supply of the instruments and equipment to the touch current tester.
The power of the instruments and equipment is placed in the ON position. Test once
under normal conditions. Test once under a single fault condition. Record the contact
current value.
6.5.4 Protective ground impedance
One end of the ground impedance tester is connected to the ground terminal of the
instruments and equipment. The other end is connected to the accessible parts of the
instruments and equipment. Set the test current to 25A. Start the tester. Record the
ground impedance value after the test is completed.
6.5.5 Cleaning
If the instruments and equipment can be cleaned, clean the instruments and equipment
three times. If the instruments and equipment can be sterilized, check whether they are
qualified by sterilizing the instruments and equipment once. If, after processing, it is
found that there are signs of moisture in the parts that may lead to danger, the
instruments and equipment shall be able to pass the dielectric strength test of 6.5.2.
6.5.6 Sprinkle
Compliance is checked by visual inspection. If in doubt, pour 0.2L of water from a
height of 0.1m for 15s on every part that may come into contact with electrical parts.
After this treatment, the instruments and equipment shall be immediately subjected to
the dielectric strength test of 6.5.2.
6.5.7 Overflow
Fill the container completely with liquid. Then use an additional volume equal to 15%
of the container capacity or 0.25L. Take whichever is larger. Pour in smoothly for 60s.
For instruments and equipment that may be moved after the container is filled with
liquid, tilt the instruments and equipment 15° in the most unfavorable direction from
its normal use position. If it is necessary to tilt in more than one direction, refill the
container with liquid. After this treatment, the instruments and equipment shall be
immediately subjected to the dielectric strength test of 6.5.2.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.