Relative humidity is a very important parameter in high and low temperature constant temperature and humidity test chambers. Reasonable and accurate measurement of relative humidity is of great significance for ensuring environmental conditions:
1. The national standard GB2423.1 specifies the temperature tolerance range of ±3 °C for the low temperature test method of the high and low temperature constant temperature and humidity test chamber. Here, ±3 °C does not mean that point or at that time, for the whole Requirements for each point of the workspace. Another problem that should also be pointed out is that the temperature tolerance of ±2 °C is the concept of allowable deviation.
2. When the temperature gradient of the military standard GJB150 is at most 2.2 °C, the uniformity of the temperature field is the relationship between the temperature of each point in the temperature zone at a certain instant. The temperature tolerance of ±2 °C should never be regarded as the setting range of the nominal value. Example 50±2°C: At this time, 50°C is the nominal value, and ±2°C is the tolerance. When setting the environmental condition parameter value, the temperature setting value can only be 50°C, but not 52°C, or 48°C. Due to the error in the control system drift adjustment and the non-uniformity of the test chamber temperature field, the measured temperature of the test temperature may not be 50 ° C, the allowable deviation but the range is not more than 52 ° C or not lower than 48 ° C
High and low temperature constant temperature and humidity test chamber meets GB/T 2423.1-2008 Test A "Cryogenic Test Method"; GB/T 2423.2-2008 Test B "High Temperature Test Method"; GB/T 2423.3-2006 Test C "Constant Humid Heat Method"; GB/T 10586-2006 "Dry heat test box technical conditions" and other national standards for design and manufacture, can carry out a variety of high and low temperature humid heat environment test.
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