Effect of high and low temperature test chamber conditions Test procedure: The reproducibility of the temperature change test depends on the exact procedure of the test parameters in 3.1.1. The following test parameter changes have a significant impact on the reproducibility:
a, the temperature change rate of the surrounding medium;
b, high temperature and low temperature;
c, heat transfer mechanism (heat convection, heat radiation, heat conduction);
d. Test medium characteristics;
Any information that affects the reproducibility of the test, such as the location and orientation of the test sample in the box or in the tank, should be specified in the relevant specifications.
The influence of the test items in the high and low temperature test chamber: The temperature change test results are affected by the differences in the following parameters of the test items:
a, heat capacity;
b. The distribution of heat on the surface of the test sample and its transfer on the surface of the test sample;
c. The heat conduction in the test sample may be uneven;
d. Thermal expansion of the components and materials that make up the test sample;
e. Mechanical properties (such as the elasticity and tensile strength of the parts and materials constituting the test sample);
f. Dimensions and tolerances;
g. Other properties that affect the internal temperature distribution of the test sample.
For the selection of the number of test samples and the understanding of the test results, the above information can be used as a guide.
Reproducibility and influence of temperature change test in high and low temperature test chamber
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