Chapter 2 General Knowledge of Electronic Hardware (2) Temperature Range of Electronic Hardware Engineers’ Illustrated Handbook - Hardware Knowledge
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Chapter 2 General Knowledge of Electronic Hardware
(III) Equipment temperature level regulations
GB/T 2423.1-2008 "Environmental testing for electrical and electronic products - Part 2: Test methods Test A: Low temperature" Article 6.6.1
GB/T 2423.2-2008 "Environmental testing for electrical and electronic products - Part 2: Test methods Test B: High temperature" Article 6.5.2
|
category
|
Serial number
|
temperature
|
|
category
|
Serial number
|
temperature
|
Serial number
|
temperature
|
|
Low temperature
|
1
|
-65℃
|
high temperature
|
1
|
+1000℃
|
12
|
+100℃
|
|
2
|
-55℃
|
2
|
+800℃
|
13
|
+85℃
|
|
3
|
-50℃
|
3
|
+630℃
|
14
|
+70℃
|
|
4
|
-45℃
|
4
|
+500℃
|
15
|
+65℃
|
|
5
|
-33℃
|
5
|
+400℃
|
16
|
+60℃
|
|
6
|
-25℃
|
6
|
+315℃
|
17
|
+55℃
|
|
7
|
-20℃
|
7
|
+250℃
|
18
|
+50℃
|
|
8
|
-10℃
|
8
|
+200℃
|
19
|
+45℃
|
|
9
|
-5℃
|
9
|
+175℃
|
20
|
+40℃
|
|
10
|
0℃
|
10
|
+155℃
|
twenty one
|
+35℃
|
|
11
|
5℃
|
11
|
+125℃
|
twenty two
|
+30℃
|
GB/T 17478-2004 "Performance characteristics of low voltage DC power supply equipment":
|
category
|
Serial number
|
temperature
|
|
category
|
Serial number
|
temperature
|
|
Low temperature
|
A
|
-40℃
|
high temperature
|
A
|
+85℃
|
|
B
|
-25℃
|
B
|
+70℃
|
|
C
|
-10℃
|
C
|
+55℃
|
|
D
|
0℃
|
D
|
+50℃
|
|
E
|
5℃
|
E
|
+40℃
|
- The manufacturer shall confirm that the power supply can operate continuously without frequency reduction under the given maximum temperature, maximum rated power output and the most unfavorable environmental conditions of natural cooling at an altitude of 2000m. The intervals of output current and output power at elevated temperatures shall be clearly marked. If the power supply adopts other cooling methods, the operating conditions shall be clearly specified and the equipment shall be tested under these operating conditions.
- Usually, the various indicators of electronic products perform well below 1000m above sea level. If the product will be sold to areas above 1000m above sea level, the temperature range should be widened and the electrical insulation distance should be increased when designing the electronic product. As the altitude increases, the air density and air pressure decrease accordingly, which will reduce the discharge characteristics of the air gap and component insulation, thereby worsening the external insulation of the electrical equipment (the impact on the insulation performance of the solids and dielectrics inside the electrical equipment will be smaller). It is generally stipulated that in areas above 1000m above sea level (not exceeding 4000m), the external insulation strength of electrical equipment shall be compensated by increasing the test voltage by 1% for every 100m increase in altitude . The external insulation impact and power frequency test voltage of the equipment should be multiplied by the correction factor K. The calculation formula of the correction factor K is as follows:
H: altitude, m.
- If it is an AC power supply, the temperature range of the working environment should be confirmed in combination with the overall inspection temperature requirements of the equipment.
GJB 2438B-2017 "General Specification for Hybrid Integrated Circuits"
|
Serial number
|
Temperature grade popular name
|
GJB 2438B-2017
|
temperature range
|
|
1
|
——
|
Space grade (K grade)
|
-55℃~125℃
|
|
2
|
Automotive Grade
|
Standard military grade (H grade)
|
-55~125℃
|
|
3
|
Industrial Grade
|
Downgrade from standard military grade (G grade)
|
-40℃~85℃
|
|
4
|
Commercial Grade
|
Quality grade specified by the contractor (Grade D)
|
0~70℃
|
|
5
|
Industry and enterprise customization
|
——
|
——
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