GB/T 10586-2006 English PDF (GBT10586-2006)

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GB/T 10586-2006: Specification for damp heat testing chambers
GB/T 10586-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 190.040
N 04
GB 10586-2006
Replacing GB/T 10586-1989
Specifications for Damp Heat Testing Chambers
ISSUED ON: APRIL 03, 2006
IMPLEMENTED ON: OCTOBER 01, 2006
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 Conditions of Use ... 7
5 Technical Requirements ... 9
6 Test Methods ... 10
7 Inspection Rules ... 18
8 Marking, Packaging and Storage ... 20
Appendix A (Informative) Judgment Methods of Suspicious Data ... 22
Appendix B (Informative) Evaluation on the Measurement Uncertainty of
Temperature Deviation ... 24
Specifications for Damp Heat Testing Chambers
1 Scope
This Standard specifies the terms and definitions, conditions of use, technical
requirements, test methods, inspection rules and marking, packaging, and storage of
damp heat test chambers.
This Standard is applicable to test chambers that conduct damp heat tests on electrical,
electronic and other products, parts and materials.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 191-2000 Packaging - Pictorial Marking for Handling of Goods (eqv ISO
780:1997)
GB/T 2423.3-1993 Basic Environmental Testing Procedures for Electric and
Electronic Products - Test Ca: Damp Heat, Steady State (eqv IEC 60068-2-3:1984)
GB/T 2423.4-1993 Basic Environmental Testing Procedures for Electric and
Electronic Products - Test Db: Damp Heat, Cyclic (eqv IEC 60068-2-30:1980)
GB/T 2423.9-2001 Environmental Testing for Electric and Electronic Products -
Part 2: Test Methods - Test Cb: Damp Heat, Steady State, Primarily for Equipment
(idt IEC 60068-2-56:1998)
GB/T 14048.1-2000 Low-Voltage Switchgear and Controlgear - General Rules
(eqv IEC 60947-1:1999)
JB/T 9512-1999 Climate Environmental Testing Equipment and Cabinet-
Determination of Sound Power Level of Noise Emitted
JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement
3.10 Temperature extremes
After stabilization, the highest and lowest measured temperature reached in the
working space.
3.11 Saturation vapour pressure
At a constant temperature, the water vapor pressure when the moisture in a given
volume of air can no longer increase.
3.12 Partial vapour pressure
At a constant temperature, in a given volume of air, the part of water vapor pressure in
the atmospheric pressure.
3.13 Relative humidity (RH)
At a constant temperature, in a given volume of air, the ratio of partial vapour pressure
to saturated saturation vapour pressure, which is expressed by a percentage.
NOTE: Relative humidity is the most common way to express the moisture content in the air.
3.14 Humidity stabilization
The humidity of all points in the working space reaches the humidity setting value and
is maintained within a given tolerance range.
3.15 Achieved humidity
After stabilization, the humidity at any point in the working space of the test chamber.
3.16 Relative humidity variation in space
After stabilization, in any time interval, the difference between the average value of the
relative humidity in the centre of the working space and the average value of the
relative humidity of other points in the working space.
4 Conditions of Use
4.1 Environmental conditions
a) Temperature: 15°C~35°C;
b) Relative humidity: no more than 85%;
c) Atmospheric pressure: 80 kPa~106 kPa;
placed.
5 Technical Requirements
5.1 Product performance
The test chamber is divided into two types: Class-l and Class-II according to its
performance. See Table 1 for its performance indicators.
5.2 Product structure and appearance requirements
5.2.1 The inner wall of the working chamber shall be made of corrosion-resistant
materials; and the surface shall be easy to clean.
5.2.2 Condensed water is not allowed to drip into the working space. It shall be
removed continuously; and shall not be used as humidification water without treatment.
5.2.3 The working chamber shall be equipped with observation windows and lighting
devices.
5.2.4 Lead through-holes shall be provided.
5.2.5 There should be a sample rack for placing or hanging samples.
5.2.6 The cabinet, ventilation ducts and refrigeration system shall be sealed reliably;
and shall not leak air, water or oil.
5.2.7 The door of the chamber shall be well sealed; and the sealing strip shall not
easily become sticky and deformed under humid and hot conditions, and be easy to
replace.
5.2.8 Appearance coating layer shall be flat and smooth, with uniform colour, and there
shall be no traces of exposed bottom, blistering, layering or scratching.
5.3 Safety and environmental protection requirements
5.3.1 The insulation resistance value between the terminal and the metal shell of the
chamber shall satisfy: more than 2MΩ in cold state, more than 1MΩ (measured by
500V megohmmeter with accuracy of Grade-1.0) in hot state; and can withstand the
voltage-withstand test with 50Hz AC voltage 1500V and the voltage time of 5s.
The expanded uncertainty of the temperature measurement system (k=2): no more
than 0.4°C.
6.1.3 Hygrometer
A wet bulb thermometer or a humidity measuring system composed of other sensors
may be used.
The expanded uncertainty (k = 2) of the humidity measurement system shall be no
greater than 1/3 of the measured humidity tolerance.
6.2 Test conditions
6.2.1 The test conditions shall meet the requirements of 4.1, 4.2 and 4.3.
6.2.2 The test is carried out under no-load conditions.
6.3 Location and number of test points
6.3.1 Three horizontal test surfaces, called upper, middle and lower layers, are set in
the working room of the test chamber. The distance between the upper layer and the
top surface of the working room is 1/10 of the height of the working room; the middle
layer passes through the geometric centre of the working room; and the lower layer is
10mm above the sample rack of the lowest layer.
NOTE: When the working room has a sloped roof or a spire, the top surface is an imaginary
horizontal plane passing through the intersection of the slope and the vertical wall.
6.3.2 The test points are located on the three test surfaces; the central test point is
located at the geometric centre of the working room; and the distance between the
remaining test points and the wall of the working room is 1/10 of their respective side
lengths (see Figure 1). But for the test chamber with the working room volume no more
than 1m3, the distance is no less than 50mm.
6.3.3 The relationship between the number of test points and the volume of the working
chamber is:
a) When the volume of the working room is no greater than 2m3, there are 9
temperature test points and 3 relative humidity test points; and the placement
position is shown in Figure 1.
6.4.1.1 Determine the temperature and humidity test points according to th...