Digital multi-meter with operational error prevention...

Details Digital multi-meter with operational error prevention... Digital multi-meter with operational error prevention...

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:
patent: 4604569 (1986-08-01), Tedd et al.
patent: 5153511 (1992-10-01), Lee
patent: 5619129 (1997-04-01), Kamiya
patent: 6218824 (2001-04-01), Oldstead et al.
patent: 19954182 (2001-05-01), None
patent: 10177042 (1998-06-01), None
“8-Bit Microcontroller with 2K Bytes Flash, AT89C2051”, AMTEL Dec. 1997.

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