Figure 3From: In vivo assessment of the impedance ratio method used in electronic foramen locators Result of one of the four experiments to validate IRMA. The root canal impedance was simulated with a 5 kΩ resistor in series with a 27 nF capacitor. The graphic shows the simulated and measured Fourier spectrum. To make the comparison, both Fourier spectra were normalized by the 250 Hz frequency component amplitude.Back to article page