Telephone test instrument

Details Telephone test instrument Telephone test instrument

H - Electricity

04

B

344/1.5

H04B 17/00 (2006.01) H04M 1/24 (2006.01) H04M 3/30 (2006.01)

Patent

CA 2037951

Abstract of the Disclosure A telephone test instrument permits voice communications with and monitoring of a telephone circuit to be tested. The instrument includes a microprocessor used in controlling various functions of the instrument. The microprocessor and other circuits of the instrument are energized from a con- nected telephone circuit and/or an internal energy supply which is automatically recharged from the telephone circuit. The microprocessor continually checks the voltage of the internal energy supply and automatically turns off a loudspeaker of the instrument, or prevents it from being turned on, if the voltage is too low. The instrument inclu- des circuitry which, in combination with the microprocessor, measures loop current or line voltage while the instrument is connected for making voice communications with the telephone circuit. When the loudspeaker within the instru- ment is energized, the earpiece receiver remains active. A belt hook connected to a housing of the instrument can con- nect an electrical ground through a switch in the instrument to the telephone circuit for providing a ground start. The instrument also includes a "crow-bar" circuit which effec- tively open-circuits the instrument from a connected telephone circuit if too high of a loop current flows.

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