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    What is the significance of modifying the preset length range based on the test data, is it suspected?

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    The length of the test column should be designed according to the test object, giving a suitable preset length to facilitate filtering out some of the interference reflection. The range of preset lengths such as different embedding conditions and test environment changes are not the same. For the free column, the interference reflection signal is weak, the bottom end reflection signal is strong, the preset length requirement is generally not high (a reasonable preset interval is OK), and for the column embedded in a more complicated environment, due to various impedances The difference is large, which will bring a lot of interference and reflection signals. Given a suitable preset length interval, it is good to filter out some non-bottom reflection signals. The "appropriate preset length interval" is appropriately adjusted according to the engineering data or the test waveform, and is not given arbitrarily, and is not dependent on a certain value. In addition, the non-bottom reflection signal may also behave as a stable characteristic in actual tests. Therefore, it is necessary to change the test position for the suspected non-bottom reflection signal to seriously interfere with the test result, and test multiple times.

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