Development of measurement methodology in the frequency range 9 kHz-45 Mhz

Important results from the project

The first part was to compare how the theoretical models used within NMI DC-LF and NMI HF agree when measuring impedance and power in the frequency range of interest. The goal was to be able to show good agreement. This part of the project is considered fulfilled. The second part was to develop traceable methods for the calibration of equipment that measure magnetic fields in the range 9 kHz-45 MHz. Methods have been completed and so this part is also to be considered fullfilled

Expected long term effects

Standards, based on low-frequency models, have been measured by both NMIs and the results agree well. This give the basis for NMI HF to be able to expand the frequency range to lower frequencies. It also gives the possibility for NMI DC-LF to expand the frequency range of impedance and improve the uncertainty for calibration of power. This part is considered fulfilled. Methods for calibration of equipment for measuring magnetic fields have shown good results. They are therefore planned to be used in up-coming calibration possibilities for loop antennas and magnetic field probes.

Approach and implementation

The project has been divided into several smaller work packages (WP). This has been proven efficient due to the fact that it has been possible to make smaller objectives that are easier to overview, without losing the overall objective. The original plan did also have a preliminary time schedule when the different WP’s were to be finished. In the end it was seen that some WP’s were rearranged in time in order not to lose any momentum in the project. This for instance in the absence of persons or other unforeseen events.