free field calibration

例句：

1. 1. In the free field calibration process, we need to ensure that the equipment is accurately aligned and tested for accuracy.
   在自由场校准过程中，我们需要确保设备准确对齐并测试其准确性。
2. 2. The free field calibration method is widely used in various industries for its high precision and efficiency.
   自由场校准方法因其高精度和高效率而广泛应用于各行业。
3. 3. During the free field calibration phase, it's important to check the alignment of the equipment and ensure that the measurements are accurate.
   在自由场校准阶段，检查设备的对齐情况并确保测量准确是重要的。