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LDC1612: Recommended method for measuring the inductance of a PCB sensor coil to verify the LDC-based measurement results

Matthias Meier1
Prodigy 180 points
Part Number: LDC1612

TI experts:

I'd like to measure the inductance of a planar, multilayer PCB sensor coil in order to independently verify the results obtained from LDC-based measurements.  What measurement technique - using T&M lab equipment - would you recommend for highest accuracy?

Thanks! 

  • 0
    TI__Genius 13335 points
    Hi Matthias,
    If the PCB sensor coil is disconnected from the circuit so that there is no parallel cap or LDC connected then you can measure the inductance using a number of tools, including: Impedance analyzer, S11 measurement with Network analyzer, even smart tweezers are fairly accurate. The important thing to note is that the PCB coil also has some parasitic capacitance so there will be a frequency where the inductance and capacitance have a resonance. We typically call this the self-resonant frequency (SRF). So if you are measuring the inductor, just note that the true value of the inductor will be seen at lower frequencies (~10x less than the SRF).
    Regards,
    Luke