This article tells you how to test the temperature of the working wall and space in the high and low temperature test chamber standards.
Test location and number of test points The test method for the temperature of the working inner wall and space specified in the high and low temperature test chamber standards
A temperature sensor is placed in the geometric center of the working space, and a surface temperature sensor is placed in the geometric center of the six walls of the studio.
If there is a lead hole or other device in the center of the work chamber wall, the distance between the test point and the hole wall or other device should not be less than 100mm.
test program
Within the adjustable temperature range of the test chamber, the highest nominal temperature and the lowest nominal temperature are selected as the test temperature.
The temperature at the geometric center point of the working space reaches the test temperature for the first time and is stable for 2 hours, and the temperature value of all test points is tested once every 2 minutes. A total of 5 tests.
Calculation and evaluation of test results
Correct the measured temperature value according to the correction value of the test instrument.
Calculate the arithmetic mean of the temperature of each test point separately.
Substitute the temperature of the inner wall of the work and the temperature of the working space into equation (5): A = | T? NT? O | / (T? O) × 100 ……………………… (5)
In the formula: A——the percentage of the difference between the thermodynamic temperature of the working room wall and the working room,%;
T? N——the average temperature of the test point on the wall of the working room, the unit is K (K);
T? O——the average temperature of the test point of the geometric center of the working space, the unit is K (K).
The result should meet: at high temperature level: should not be higher than 3% of the temperature of the test chamber
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