GB/T 2423.63-2019 English PDF (GBT2423.63-2019)

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GB/T 2423.63-2019: Environmental testing - Part 2: Test methods - Test: combined temperature (cold and heat) / low air pressure / vibration (mixed mode)
GB/T 2423.63-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.040
K 04
Environmental testing - Part 2: Test methods -
Test: combined temperature (cold and heat)/low air
pressure/vibration (mixed mode)
ISSUED ON: MAY 10, 2019
IMPLEMENTED ON: DECEMBER 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 General description ... 5 
5 Test apparatus ... 5 
6 Mounting of specimens ... 6 
7 Severities ... 6 
7.1 General ... 6 
7.2 Temperature severity ... 6 
7.3 Air pressure severity ... 6 
7.4 Vibration severity ... 7 
7.5 Duration of combined test of temperature (cold and heat)/low air pressure/vibration
(mixed mode) ... 10 
8 Preconditioning ... 12 
9 Initial test ... 12 
10 Test ... 13 
10.1 Test preparation ... 13 
10.2 Conditioning test ... 13 
11 Intermediate test ... 14 
12 Recovery ... 15 
13 Final test ... 15 
14 Failure criterion ... 15 
15 Information to be given in the relevant specifications ... 15 
16 Information to be given in the test report ... 16 
Annex A (Informative) Guidelines ... 18 
Environmental testing - Part 2: Test methods -
Test: combined temperature (cold and heat)/low air
pressure/vibration (mixed mode)
1 Scope
This Part of GB/T 2423 specifies the basic requirements, severities, test
procedure and other technical details for the combined test of temperature (cold
and heat)/low air pressure/vibration (mixed mode).
This Part is suitable for determining the product's adaptability for storage,
transportation and use under the combined effects of temperature (cold and
heat)/low air pressure/vibration (mixed mode). Combined tests with
temperature changes may refer to this Part.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 2422 Environmental testing - Guide to drafting of test methods - Terms
and definitions
GB/T 2423.1 Environmental testing - Part 2: Test methods - Tests A: Cold
GB/T 2423.2 Environmental testing - Part 2: Test methods - Tests B: Dry heat
GB/T 2423.10 Environmental testing - Part 2: Test methods - Test Fc:
Vibration (sinusoidal)
GB/T 2423.21 Environmental testing - Part 2: Test methods - Test M: Low air
pressure
GB/T 2423.22 Environmental testing - Part 2: Tests methods - Test N:
Change of temperature
GB/T 2423.26 Environmental testing - Part 2: Tests methods - Test Z/BM:
Combined dry heat/low air pressure tests
7.4.2.4 Duration
The test duration specified in the relevant specifications is measured in min (or
h or d) and shall be as close as possible to the sequence of numbers: … 1, 2,
5, 10 … given with a tolerance of +5%. It shall comply with the requirements of
GB/T 2423.58.
7.4.3 Narrowband random vibration
The relevant specifications shall specify the number of narrowband random
superimposed on the background acceleration spectral density.
The following requirements shall be made for each narrowband randomly:
a) Narrowband random bandwidth; the minimum value shall be 0.5%;
background random bandwidth does not exceed 10%. The lower limit is
not less than 2 times the frequency resolution.
b) Start-stop frequency of the scan.
c) Give the sweep frequency speed defined in oct/min or Hz/s, or give the
time of one sweep cycle.
d) Number or duration of narrowband scans.
e) Sweep logarithmically or linearly.
f) Starting direction of each scan segment, up or down.
g) Each narrowband spectrum is specified within the bandwidth of f1 and f2.
When combining all narrowband and background acceleration spectral density
values, select the SUM or MAX strategy. See GB/T 2424.26.
7.4.4 Sine wave component
The relevant specifications shall specify the number of sinusoidal components
superimposed on the broadband acceleration spectral density. It shall be noted:
a) Whether there is a harmonic relationship between each other, and their
phase relationship.
Note: The phase relationship is for the controller output; the phase relationship of
the acceleration signal changes due to the transfer function of the vibration
exciter and/or fixture and the specimen.
b) Start-stop frequency of the sweep.
10 Test
10.1 Test preparation
The relevant specifications shall stipulate that the vibration shall be carried out
on one or several axes of the test specimen. When the vibration is specified on
several axes during the entire test process, the entire test procedure shall be
repeated on each specified axial direction.
For the heat-dissipating test specimen, it shall use the test method without
forced air circulation in GB/T 2423.1 test Ad. For heat-dissipating test
specimens without cooling devices, when the test chamber (room) is large
enough, but only forced air circulation can maintain the test temperature in the
chamber (room), method A in Test Ad can be used. When the volume of the test
chamber is too small to meet the free air condition, method B in test Ad shall be
used. For heat-dissipating test specimens with cooling devices, method A in
test Ad can be used. However, the relevant specifications shall stipulate the
characteristics of the supplied coolant. If it is air, it shall avoid being affected by
oil pollution and humidity.
For the non-heat-dissipating test specimen, it shall adopt the test method of
forced air circulation.
10.2 Conditioning test
10.2.1 Vibration test
The combined test chamber (room) is at the temperature of the test room. The
test specimen, under the condition of not being packaged and not energized, is
installed on the vibrating table according to the specified axle; and then the
vibration test is performed according to the severity specified by the relevant
specification.
When required by the relevant specifications, the test specimens shall be tested
for performance.
10.2.2 Temperature test
The test specimen keeps the installation during the vibration test.
The temperature in the test chamber (room) shall be adjusted to the value
specified in the relevant specifications; the temperature of the test specimen
shall be stabilized.
The rate control of temperature change in the test chamber (room) shall meet
12 Recovery
At a rate of not more than 10 kPa/min, the air pressure in the test chamber
(room) returns to normal atmospheric pressure. During pressurization,
temperature control is not necessary. The rate control of temperature change
in the test chamber (room) shall meet the requirements of GB/T 2423.22 and
return to the normal test room climate state. After that, the test specimen is
recovered in the test chamber (room) according to relevant specifications. See
Figure 2 and Figure 3.
The test specimen shall be recovered under standard atmospheric conditions.
When the standard atmospheric conditions are not suitable for the test
specimens, the relevant specifications may specify other recovery conditions.
When the test specimen is recovered under standard atmospheric conditions,
the recovery time shall be sufficient to make it reach a stable temperature; the