
Review of Short Phrases and Links 
This Review contains major "Impedance" related terms, short phrases and links grouped together in the form of Encyclopedia article.
Definitions
 Impedance is the resistance the body's tissue to the passage of electrical current.
 Impedance is defined as the frequency domain ratio of the voltage to the current.
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 Impedance is defined by the ratio of two phasors where a phasor is the complex peak amplitude of a sinusoidal function of time.
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 Cable impedance is a characteristic of cables used in electrical engineering, used to allow better communication through them.
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 Cable impedance is a function of size and installation, not manufacturer, so you should be able to get fairly close.
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 For more general periodic sources and even nonperiodic sources, the concept of impedance can still be used.
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 The cable and equipments used by the telephone companies have effect what the real impedance is.
 No. 5,046,960 to Fedder, these air spaces can be used to provide some control over the characteristic impedance of the mated contact.
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 System Impedance The resistance to air flow when moving air through an airflow system.
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 Magnitude of the internal cable reflections, measured in decibels, relative to the actual cable impedance, not the system impedance.
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 A purely resistive impedance will always have a phase angle of exactly 0 o (Z R = R Ω ∠ 0 o).
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 For example, a transmitter, interconnecting cable, and receiver should all have matching impedance.
 Cables impose specific impedance in a signal path.
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 IBM STP (Shielded Twisted Pair) has a characteristic impedance of 150 ohms.
 Percent body fat can be determined with calipers that measure a fold of skin, water displacement, or bioelectrical impedance analysis (BIA).
 The specific acoustic impedance z is the ratio of sound pressure p to particle velocity v at a single frequency.
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 The pickup is a special lowimpedance model (the JCB1), which produces a bass sound high impedance pickups and active electronics can't match.
 Balun An impedance matching transformer that converts the impedance of one interface to the impedance of another interface.
 Changes in complex impedance (resistive + reactive) during the cardiac cycle is correlated to ventricular volume.
 Unshielded twisted pair, with an intrinsic impedance of 100 ohms, is the most common type of computer network cabling used today.
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 In one variation, the electrical impedance of the patient tissue 56 is used as a measure of the degree of coagulation.
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 The concept of electrical impedance generalizes Ohm's law to AC circuit analysis.
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 In order to determine the hematocrit, the electrical impedance of the blood is measured and mapped by a mapping function to a corresponding hematocrit value.
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 Acoustic impedance, being a complex quantity, can have real and imaginary components analogous to those in an electrical impedance.
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 This increased acoustic impedance reduces the required displacement of the loudspeakers and hence increases their lifetime due to reduced metal fatigue.
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 If multiple cable sections are used, it can result in "impedance mismatches" that are caused by slight differences in the impedance of each cable section.
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 Common causes of echo include impedance mismatches in analog circuitry, and acoustic coupling of the transmit and receive signal at the receiving end.
 Standing wave and reflection effects due to impedance mismatch between circuit and cable.
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 Impedance plethysmography: the relationship between venous filling and sensitivity and specificity for proximal vein thrombosis.
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 As a general rule, the greater the overlap, the lower the antenna impedance.
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 Specific acoustic impedance is the complex ratio of the effective sound pressure at a point to the effective particle velocity at a point.
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 Optionally, the accuracy of both the impedance and direct volume measurements can be improved by producing larger arterial pulses in the finger.
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 Comparison of the accuracy of impedance plethysmography and compression ultrasonography in outpatients with clinically suspected deep vein thrombosis.
 The load on the cable should be high (low impedance) and the driving amplifier should be able to "pump" current into the cable.
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 Acoustic impedance can be expressed in either its constituent units (pressure per velocity per area) or in rayls.
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 This method is used in applications such as electrical impedance tomography, a type of industrial and medical imaging.
 Impedance: The total opposition that a circuit offers to the flow of alternating current or any other varying current at a particular frequency.
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 Impedance: The total opposition to electrical flow (resistive plus reactive).
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 Also here, category 3 cables with impedance of 100 Ohm and RJ45 adapters are used in a system of max.
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 Similarly, the reciprocal of an impedance is called admittance.
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 Insulated gate bipolar transistors (IGBTs) use a medium power IGFET, similarly connected to a power BJT, to give a high input impedance.
 The impedance as measured at the unloaded output terminals of transmission equipment or a line that is otherwise in normal operating condition.
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 The bell circuit is either designed so that it has high impedance in audio frequencies or it is disconnected from line when phone is picked offhook.
 The 620 ohm resistor serves to reduce loading of the line if the output is connected to a very low impedance.
 In the general case however, equivalent impedance transforms in addition to series and parallel will be required.
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 Here, the dipole water molecules increase the reactance (impedance) and lower the permittivity of the air as humidity rises in the localized parcel of air.
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 The middle ear allows the impedance matching of sound traveling in air to acoustic waves traveling in a system of fluids and membranes in the inner ear.
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 Temperaturedependence of the speed of sound in air c, density of air ρ and acoustic impedance Z vs.
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 The data for impedance plethysmography and ultrasound are summarized in Table 3 for symptomatic patients.
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 The red and white blood cell counts are made by applying the pulses provided when monitoring the impedance of the flow cell to a digital counter.
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 Step g) includes monitoring the coagulation of the patient tissue using at least the compensated measured acoustic impedance.
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 The same is true for variations in impedance from point to point within the cable.
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 What follows below is a derivation of impedance for each of the three basic circuit elements, the resistor, the capacitor, and the inductor.
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 The number of water molecules absorbed determines the electrical impedance of the capacitor, which is in turn proportional to the water vapour pressure.
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 When the charge comes down the center electrode, it sees a high impedance and cannot jump the gap, hence a "Misfire".
 The volume of individual erythrocytes can be electronically determined by measurement of their electrical impedance or their lightscattering properties.
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 Such calculations may be modified to take into account the impedance of the blood measured as described above.
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 Impedance cardiography (ICG) is a hemorheology technique of using sensors to detect the properties of the blood flow in the Thorax.
 Impedance plethysmography  A noninvasive diagnostic test used to evaluate blood flow through the leg.
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 The total impedance of many simple networks of components can be calculated using the rules for combining impedances in series and parallel.
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 Better still, the scalp sensation was minimal, because there was no impedance to the passage of magnetic field into the brain.
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 Mixed cable types should not be connected in series as the impedance per pair differs slightly and could cause signal degradation.
 The first long telephone air lines (two wires on the poles separated from each other at some distance) used to have impedance of around 600 ohms.
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 Thus, a midbus device transceiver presents an impedance mismatch to the cable and inevitably creates some degree of reflected energy.
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 Return loss is a measure of the reflected energy caused by impedance mismatches in the cabling system.
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 It is common in acoustical analyses to represent specific acoustic impedances in terms of their ratio to the characteristic impedance of air.
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 The magnitude of the complex impedance is the ratio of the voltage amplitude to the current amplitude.
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 For small amplitudes, sound pressure and particle velocity are linearly related and their ratio is the acoustic impedance.
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 As a blood cell passes through the opening, the impedance increases causing a pulse to be provided by the electrical apparatus.
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 The relationship between frequency and impedance may not even be linear outside of the device's rated range.
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 There exist an effect that characteristic impedance of a cable if changed with frequency.
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 Because of the frequency, the Interferential wave meets low impedance when crossing the skin to enter the underlying tissue.
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Categories
 Automation > Machinery > Machines > Cable
 Si Unit
 Encyclopedia of Keywords > Information > Communication > Transmission Medium
 Films > Film > Video > Twisted Pair
 Resistance
Related Keywords
* Basses
* Cable
* Cables
* Cable Impedance
* Cabling
* Capacitance
* Change
* Changes
* Characteristics
* Characteristic Impedance
* Circuit
* Coaxial Cable
* Coaxial Cables
* Complex Number
* Conductivity
* Connector
* Csf
* Current
* Device
* Dielectric
* Electrical
* Electrodes
* Higher
* Imaginary Part
* Inductance
* Magnitude
* Match
* Matches
* Measure
* Measuring
* Network
* Ohm
* Ohms
* Output
* Phase
* Reflection
* Resistance
* Signal
* Si Unit
* Telephone
* Telephone Line
* Transducer
* Transmission
* Transmission Medium
* Twisted
* Twisted Pair
* Utp
* Voltage

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