Characteristic Curve

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characteristic curve

[‚kar·ik·tə′ris·tik ′kərv]
(graphic arts)
In photography, a graph that shows how increases in exposure increase the density of the film.
One of a pair of conjugate curves in a surface with the property that the directions of the tangents through any point of the curve are the characteristic directions of the surface.
A curve plotted on graph paper to show the relation between two changing values.
A characteristic curve of a one-parameter family of surfaces is the limit of the curve of intersection of two neighboring surfaces of the family as those surfaces approach coincidence.

Characteristic Curve


one of the most important indexes of a photographic material. It expresses (for specified exposure and developing conditions) the optical density obtained from photographic darkening of the material as a function of the common logarithm of the exposure that produced the darkening. (SeeSENSITOMETRY.)

Characteristic curve

A graphical display depicting complex nonlinear relationships in electronic circuits. A typical use is to show voltage-current relationships in semiconductor devices. Device amplification capabilities, for example, are exhibited by a characteristic plot which traces output current versus output voltage with a third controlling variable as a parameter. This control variable could be the base current of a bipolar junction transistor (BJT) or the gate-to-source voltage of a metal-oxide-semiconductor (MOS) transistor.

Other characteristics often included in transistor data sheets are displays of current gain versus bias current, gain versus frequency, and input and output impedances versus frequency. Less commonly, other graphical nonlinear relationships, such as the variation of thermocouple voltage with temperature or the dependence of electrical motor torque with current, also are known as characteristic curves.

In the past, characteristic curves were used as tools in the graphical solution of nonlinear circuit equations that are followed by relationships of this type. In current practice, this analysis is performed using computer packages for circuit simulation. Designers still use characteristic curves from data sheets, however, to evaluate relative performance capabilities when selecting devices, and to provide the information needed for a preliminary pencil-and-paper circuit design. See Amplifier, Transistor

References in periodicals archive ?
The uncertainty of DCCB virtual sensors is created by two factors: 1) the uncertainty of measurements from sensors and propagation of this uncertainty through the empirical and/or analytic relationships from which the virtual sensor values are determined, and 2) uncertainty in the device characteristic curves.
Thus, ZF relies on a valve with a linear characteristic curve and preload for its new damper generation.
There are two main ways of using characteristic curves.
As for most soils, the hydraulic properties related to a shrink-swell soil are defined by the soil water characteristic curve (the relationship between the moisture content and the potential), and the near-saturation hydraulic conductivity (K and [psi]).
Typically, collected data are displayed as a series of LIV characteristic curves.
If the p parameter is given discreet values the coordinates of the characteristic curves plotted on the abrasive tool can be determined.
Summary of the model parameters for the soil dispersion characteristic curves (SDCC) and aggregate liberation and dispersion curves (ALDC) for all samples [E.
A computer program for rapid generation of receiver operating characteristic curves and likelihood ratios in the evaluation of diagnostic tests.
The dependence on the metering section to build-up the pressure for the pumping operation leads to screw characteristic curves (throughput vs.
Both linear and non-linear regression techniques were used to establish soil moisture characteristic curves, and soil strength characteristic curves at 3 levels of compaction for each soil.

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