| 摘要 |
AN ELECTRONIC UTILITY METER TO MONITOR MAGNETIC FIELDS IN UTILITY METERS AND TO INDICATE THE PRESENCE OF ABNORMALLY LARGE MAGNETIC FIELDS. THE METER COMPRISES MEANS FOR DETECTING CONSUMPTION OF A UTILITY, MEANS FOR INDICATING THE RESULT OF THE DETECTION AND MEANS(20) FOR DETECTING THE PRESENCE OF MAGNETIC FIELD ORIGINATING OUTSIDE THE METER.PREFERABLY, THE MAGNETIC FIELD DETECTION MEANS(20) INCLUDES A DETECTION CIRCUIT(21) WHICH INCLUDES AN INDUCTANCE (L) IN THE FORM OF A COIL WOUND AROUND A FERRITE CORE.FIGURE 1
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