Advanced Electrical Measurements |
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Page 116
... filament and the ordinary , or control , grid , and is operated at a positive potential , so as to repel any positive ions emitted by the filament . This also has another advantage , since it dissi- pates the space charge in the ...
... filament and the ordinary , or control , grid , and is operated at a positive potential , so as to repel any positive ions emitted by the filament . This also has another advantage , since it dissi- pates the space charge in the ...
Page 187
... filament with the plate and grid at a positive potential of several hundred volts with respect to the filament . Do this slowly enough so that the evolved gas never reaches a pressure of more than 10 – 3 mm . , and continue until the ...
... filament with the plate and grid at a positive potential of several hundred volts with respect to the filament . Do this slowly enough so that the evolved gas never reaches a pressure of more than 10 – 3 mm . , and continue until the ...
Page 207
... filament type , is shown in Fig . 102. It consists of a telescope , which may be focussed on the unknown source , with a small calibrated lamp , mounted with its filament in the focal plane of the telescope . MA Filament Screen FIG ...
... filament type , is shown in Fig . 102. It consists of a telescope , which may be focussed on the unknown source , with a small calibrated lamp , mounted with its filament in the focal plane of the telescope . MA Filament Screen FIG ...
Contents
CHAPTER IOBSERVATIONAL DATAGRAPHICAL REPRE | 1 |
CHAPTER IIMEASUREMENT OF RESISTANCE | 14 |
Measurement of Specific Resistance | 20 |
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a₁ accuracy adjustment alternating current ammeter ampere amplifier apparatus as shown balance ballistic galvanometer battery calibration capacitance cathode centimeter charge circuit coil compute condenser conductors connected constant correction couple Courtesy of Leeds current flowing cycle D'Arsonval damping decrease determined dial direct current discharge electrical electrometer electromotive force electrons electrostatic equal equation errors EXPERIMENT filament flux frequency gauge high resistance instrument ions junction K₁ known laboratory Leeds and Northrup low resistance manometer maximum McLeod Gauge mercury metal meter method millimeters mutual inductance needle obtained ohms oscillator plate current Plot a curve position potential difference potentiometer precision measure pressure proportional pyrometer quadrants quantity R₁ R₂ ratio reading rheostat sensitivity shown in Fig shunt slide wire standard cell standard resistance switch temperature thermocouple torque unit unknown usually V₁ vacuum tube variable velocity voltage voltmeter volts wave length Wheatstone bridge zero