What is the steady state test method

the steady state test method for thermal pad.
The steady-state test method is a relatively basic method and is also relatively accurate. Many times this test method exists as a standard. The main methods are the plate method and the guard plate method. The benefits of applying this method The corresponding results can be obtained directly, and the cost is relatively small, but because the operation is relatively simple, so many factors affect the results, which does not mean that it is not easy to get the correct answer, and with With the development of the cardinality, the accuracy of this method is becoming less and less, and the requirements for operation are relatively high, so the experimental results are often unsatisfactory, and there is no way to obtain valid data. This is also one of his willingness to be gradually replaced.