For the best axial sensing response, it is recommended that the size of the metal target to be sensed is at least the size of the coil beneath it. Best practice is to ensure the uniform metal target is flat, as any discontinuities (such as gaps, voids, indents) will result in noise.

It is also recommended to use the same target, as switching targets will result in a different frequency response detected by the LDC, making it difficult to determine the absolute distance. For example, a copper plate of size A may have a different response at a fixed distance compared to a copper plate of size B. Same goes for different conductive material types. This can be challenging since the device output might not be able to maintain a stable oscillation or have a degraded signal-to-noise ratio (SNR) in these applications.

For more information on LDC target design, see the LDC Target Design.