Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1978-01-23
1979-04-17
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307234, 328111, 328151, G11C 2702, H03K 5153, H03K 518
Patent
active
041503104
ABSTRACT:
A track and hold system for use with a test instrument such as a multimeter includes an input circuit, a buffer amplifier, a storage device such as a capacitor, an output amplifier, an output circuit, a detector for detecting a pulse on a signal passing from the input to the output, and a switch responsive to the detector for isolating the storage device from the input circuit but not the output circuit for a predetermined period. The system also includes a timer responsive to the detector to provide an isolation command to the switch for the predetermined period. Further, the system includes a delay circuit, responsive to the detector, for interposing a delay of variable duration prior to activating the timer. In a preferred embodiment, where the system is used in conjunction with a multimeter having a "hold" circuit which directs the meter to display the last-measured signal, an output is provided to the hold input of the meter directing the meter to "hold" for predetermined periods whenever the switch opens or closes. The "hold" output circuit is also used to provide indefinite retention of a reading and trigger lockout for the detector circuitry.
REFERENCES:
patent: 3875516 (1975-04-01), Thomas
Manzo Edward
McMahon Kevin
Sangamo Weston, Inc.
Sherman W. R.
Zazworsky John
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