. The Bell System technical journal . +200L MICROSECONDS Fig. 27—Start of stable glow discharge of A transient (voltage). 2 0<. 4 6 MICROSECONDS Fig. 28—Start of A transient (current). CONTACT PHENOMENA IN TELEPHONE SWITCHING CIRCUITS 57 charges slowly back through the load relay to the battery peak voltage reached may be as high as 2000 volts. The principal characteristics of the B discharge can be producedby a simple experiment which does not use a load relay, The transientis not dependent on a load inductance, but only on a source of voltagewhich will charge a wire at a suffi
. The Bell System technical journal . +200L MICROSECONDS Fig. 27—Start of stable glow discharge of A transient (voltage). 2 0<. 4 6 MICROSECONDS Fig. 28—Start of A transient (current). CONTACT PHENOMENA IN TELEPHONE SWITCHING CIRCUITS 57 charges slowly back through the load relay to the battery peak voltage reached may be as high as 2000 volts. The principal characteristics of the B discharge can be producedby a simple experiment which does not use a load relay, The transientis not dependent on a load inductance, but only on a source of voltagewhich will charge a wire at a sufficiently rapid (but not too rapid) ratewhile a pair of contacts, which initially ground the wire, are a wire about 100 ft. long is connected to a source of somewhat morethan 350 volts through a resistance of from 5000 to 20,000 ohms, and isalso grounded by a contact at one end, a transient is produced whenthe contacts open which shows the characteristics of a B typetransient except the final dying away of the voltage to 50 volts. It must not be understood that every spark transient is purely of either the A or
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