Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Meter protection or fraud combatting
Reexamination Certificate
2006-10-24
2006-10-24
Patel, Paresh (Department: 2829)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Meter protection or fraud combatting
C324S115000
Reexamination Certificate
active
07126325
ABSTRACT:
The present utility model provides a digital multi-meter that can not only; generate warning signal when the test probe is misplugged but also indicate the assigned socket before the probe is plugged in. The multi-meter contains a socket indicating a misplug warning circuit whose micro-control unit is connected with each measurement function switch via its terminals respectively. When any measurement function switch is closed and its corresponding socket is unclosed, the micro-control unit switches on the relevant LED to emit light via connected terminal in order to indicate the assigned docket. On the contrary, the micro-control unit switches off the LED to stop emitting light in order to indicated the proper operation. The multi-meter can indicate not only mis-operation after the probe has been plugged in but also the assigned socket before it so that it decreases the possibility of mis-operation and avoids damage effectively and elongates its working life.
REFERENCES:
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patent: 5619129 (1997-04-01), Kamiya
patent: 6218824 (2001-04-01), Oldstead et al.
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“8-Bit Microcontroller with 2K Bytes Flash, AT89C2051”, AMTEL Dec. 1997.
Dorsey & Whitney LLP
Patel Paresh
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