| 摘要 |
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.
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