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impedance |
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impedance /im·ped·ance/ (im-pēd´ans) obstruction or opposition to passage or flow, as of an electric current or other form of energy. Symbol Z . acoustic impedance an expression of the opposition to passage of sound waves, being the product of the density of a substance and the velocity of sound in it. aortic impedance the sum of the external factors that resist ventricular ejection. impedance [impē′dəns] Etymology: L, impedire, to entangle a form of electric resistance observed in an alternating current that is analogous to the classic electric resistance that occurs in a direct current circuit. It is expressed as a ratio of voltage applied to a circuit to the current it produces, as an alternating current oscillates ahead of or behind the voltage. impedance obstruction or opposition to passage or flow, as of an electric current or other form of energy. acoustic impedance an expression of the opposition to passage of sound waves, being the product of the density of a substance and the velocity of sound in it. Impedance Cardiac pacing The total opposition that a circuit presents to alternating electrical current. Cf Resistance. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The load cell simulator is a passive electrical network with connections and impedances representative of most load cells and an output providing a voltage-ratio that is selectable in steps from 0 mV/V to 10 mV/V. Termination impedances are also more tightly constrained to reduce ringing in the signals that could cause plateaus or bumps in the signal edge, resulting in delayed threshold crossings. Both systems used optically isolated amplifiers with high common mode rejection, high input impedances, and isolated power supplies. |
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