. The Bell System technical journal . high resistances in circuits when aWheatstone bridge is not available. High resistances in the mainframe protector springs and heat coils of lx)th subscribers lines andtoll circuits are also determined by a current How methcKl, a specialfK)rtable testing set, however, being designed particularK for thispiir[x>se. 360 DELL SYSTEM TECHNICAL JOURXAL Direct currents and voltages are ver> important factors in theoperation and maintenance of amplifier circuits such as telephonerepeater and carrier apparatus. The battery supply arrangementsfor a single tube
. The Bell System technical journal . high resistances in circuits when aWheatstone bridge is not available. High resistances in the mainframe protector springs and heat coils of lx)th subscribers lines andtoll circuits are also determined by a current How methcKl, a specialfK)rtable testing set, however, being designed particularK for thispiir[x>se. 360 DELL SYSTEM TECHNICAL JOURXAL Direct currents and voltages are ver> important factors in theoperation and maintenance of amplifier circuits such as telephonerepeater and carrier apparatus. The battery supply arrangementsfor a single tube amplifier are shown in Fig. 6. It is necessary in order to insure efficient amplitication withoutdistortion to regulate the currents and voltages to fairly close practice provision is made for quickly reading the voltages of grid,filament and plate batteries as shown by the voltmeter connection(\) in the figure. The plate current is read by the milli-ammeterM and the filament current bv the ammeter A. The filament current. Filament ■+■ PlateBattery Battery Fig. 6 is regulated to meet the operating limits by cutting resistance in orout of the circuit with the rheostat R. The same applications ofcurrent and voltage readings apply to the more complicated amplifiercircuits, although wherever practicable automatic regulating devicesare jiroxidcd which reduce the amount of manual testing work to aminimum. Capacity Mcasiiremenls. There is little occasion in transmissionmaintenance work to make accurate direct current measurements ofcapacit\-. .\ simple ( test, however, has been provided for useI)rimaril\ mi siilisirilurs Iciojis fur cliecking the condensers in the sets. jroof
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
