. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 346 BELL SYSTEM TECHNICAL JOURNAL detector thereby initiating the operation of relay Z. At the same time, another set of contacts of relay W close the charging circuit of con- denser Ci thereby permitting the charging of this condenser through the high resistance Ri. These conditions remain unchanged until the armature of relay Z has reached its tn contact and caused the operation. B,:i: , T I [Oscilll"* i-atorj — r 1 \.^<u— ' Detector I L^SS^ ! 1 r- L Fig. 2 o
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 346 BELL SYSTEM TECHNICAL JOURNAL detector thereby initiating the operation of relay Z. At the same time, another set of contacts of relay W close the charging circuit of con- denser Ci thereby permitting the charging of this condenser through the high resistance Ri. These conditions remain unchanged until the armature of relay Z has reached its tn contact and caused the operation. B,:i: , T I [Oscilll"* i-atorj — r 1 \.^<u— ' Detector I L^SS^ ! 1 r- L Fig. 2 of relay X. The latter relay first opens the charging circuit of con- denser Ci and then causes the operation of relay Y. The operation of relay Fdischarges the two condensers Ci and C2 through the differential meter circuit composed of the meter M and the two equal resistances i?5 and i?6- Additional resistances R^ and Ri are connected into the discharge circuit to limit the discharge current and prevent sparking at the relay contacts. If the meter shows no deflection at the instant of discharge, it indicates that the two charges are equal and that the operating time of relay Z is as indicated by the value of resistance Ri. If the meter shows a deflection, the key K should be opened and closed repeatedly and the resistance Ri adjusted until the meter shows no deflection. In order to prevent a quick double deflection of the meter when a balance has been reached, it is necessary that the time constant of the two branches of the discharge circuit be approximately alike. For this reason, the ratio Ri + Rs to R3 + R^ of the discharge circuit resistances should be approximately the same as the ratio Ci to C2 of the condenser capacities. The releasing time of relay Z; that is, the time required for the armature to leave its w contact after the oscillator is removed from the detector, may be measured by making a few simple changes in the. Please note that these images are extracted
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
