Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Determining machine or apparatus operating time or...
Patent
1991-03-20
1992-10-13
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Determining machine or apparatus operating time or...
377 14, 377 30, 377 39, 377 20, 364467, G07B 1310
Patent
active
051557479
ABSTRACT:
An anti-fraud device for digital measuring instrument includes a sensing encoder integrated circuit combinably packed with a sensor, and a measuring decoder integrated circuit combinably packed with a measuring meter for receiving signal as sensed from the sensor through a transmission line. When an external-signal generator is fraudulently installed on the transmission line for increasing output signals into the meter for cheating a meter fare, an external signal from the external-signal generator will be first checked by the measuring decoder integrated circuit provided before the measuring meter to be different from a prestored data in the measuring. Then the measuring decoder will not output a valid pulse to be counted in the measuring meter, without increasing an unwanted meter fare or fees for preventing a fraud matter.
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