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control grid

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.02 sec.
control grid
n
(Electronics) Electronics another name for grid [6] in a tetrode, pentode and similar devices

control grid
An electrode used in triodes, tetrodes, and pentodes, placed between the cathode and the plate (usually very close to the cathode). Electrons emitted by the cathode must pass through the control grid to reach the positively charged plate and create current flow through the tube, but a negative voltage on the intervening control grid impedes that flow; the more negative the control grid, the smaller the flow. Small variations in the voltage of the grid thus have a great effect on the current flow.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.control grid - an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube
electrode - a conductor used to make electrical contact with some part of a circuit
electron tube, thermionic tube, thermionic vacuum tube, thermionic valve, vacuum tube, tube - electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope


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The winter access road into the site and the surface control grid are being established in preparation for the diamond drilling program to follow.
Phase II calls for control grid establishment and infill geochemical sampling to be followed by drilling in Phase III to test key zones.
At present, most of the initial control grid has been cut, extensive soil sampling has begun and an excavator has been moved onto the property in preparation for trenching Magnometer, vlf-em and IP surveys are forthcoming, pending the geophysical crew's arrival.
 
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