control grid


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control grid

[kən′trōl ‚grid]
(electronics)
A grid, ordinarily placed between the cathode and an anode, that serves to control the anode current of an electron tube.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

grid

(1) Any interconnected set of nodes such as the electric power network or a communications network.

(2) "The Grid" is a nickname for Internet2. See Internet2.

(3) In a vacuum tube or gas-filled electron tube, the grid is a perforated electrode through which electrons may pass. The term typically refers to the control grid in a triode, tetrode or pentode vacuum tube. In these cases, the grid is used to control the amount of current flow between the cathode and plate (anode). As the voltage potential is varied on the control grid, the amount of current allowed to pass through also varies. Relatively small fluctuations in the grid's potential can control substantially larger amounts of current flow through the tube. This phenomenon is referred to as "gain." Tetrodes and pentodes use additional grids to regulate current flow and effect gain. See screen grid and suppressor grid.
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References in periodicals archive ?
montanus abundance which varied from 21.00 [+ or -] 9.57 voles/ha in control grids to 39.34 [+ or -] 24.34 voles/ha in removal grids (Table 1; Fig.
In Chi-Square Contingency Tests for spring, autumn, and winter, species composition (the number of individuals captured in summer was too low to perform a meaningful test), data from untreated grids were combined and data from control grids were combined.
In the present study, we analyzed the extracts of 556 blood samples from 298 mice from the non-vaccine control grids by a multiplex, quantitative real-time PCR for 16S rDNA that discriminated between B.
In the first of three tests (16 July), there were no significant differences in the number of caches removed from the unwatered control grids and the watered [TABULAR DATA FOR TABLE 2 OMITTED] experimental grids (chi-square tests, P [greater than] 0.05).
Gradient control grids used at these sites raise local earth potentials in the same way gradient control wires do.
The total numbers of individual Peromyscus leucopus captured in each exclosure during each year of the 10 y study were compared to the total numbers of individuals captured in their companion control grids by paired t-tests (EXCEL, Microsoft Inc.).